What does it mean?

This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to OBD-II equipped vehicles. Although generic, specific repair steps may vary by make/model.

The COP (coil-on-plug) ignition system is what’s used on most modern engines. There’s an individual coil for each cylinder that’s controlled by the PCM (powertrain control module).

It eliminates the need for spark plug wires by placing the coil right above the spark plug. Two wires are dedicated to each coil. One is a battery feed typically from the electrical distribution center. The other wire is the coil control circuit from the PCM. The PCM grounds/ungrounds this circuit to activate or deactivate the coil. The coil control circuit is monitored by the PCM for faults.

If an open or short circuit is detected in the control circuit for coil number 1, a P0351 may be set. Additionally, depending on the vehicle, the PCM may also shut down the fuel injector for that cylinder as well.

Symptoms

Symptoms of a P0351 DTC may include:

• MIL (malfunction indicator lamp) illumination
• Engine misfire may be present or intermittent

Causes

Potential causes of a P0351 code include:

• Short to voltage or ground on COP driver circuit
• Open in COP driver circuit
• Loose connection at coil or broken connector locks
• Bad coil (COP)
• Faulty powertrain control module

Possible Solutions

Is the engine currently misfiring? If not, the problem is likely intermittent. Try testing the wiring at coil #1 and along the wiring harness to the PCM. If manipulating the wiring causes a surface misfire, repair the wiring issue. Check for poor connection at the coil connector. Verify the harness isn’t misrouted or rubbing against anything. Repair as necessary.

If the engine is currently running rough, stop the engine and disconnect the wiring connector from coil #1. Then start the engine and look for a driver signal to coil #1. Using a scope will give you a visual pattern to observe, but since most people don’t have access to one, there’s a simpler way. Use a voltmeter on the AC Hertz scale and see if there’s a Hz reading between 5 and 20, indicating the driver is working. If there’s a Hertz signal, replace ignition coil #1. It’s likely bad. If you detect no frequency signal from the PCM on the ignition coil control circuit, indicating the PCM is grounding/ungrounding the circuit (or if there’s no visible pattern on the oscilloscope if you have one), leave the coil disconnected and check DC voltage on the trigger circuit at the ignition coil connector. If there’s significant voltage on that wire, there’s a short somewhere. Find the short and repair it.

If there’s no voltage on the trigger circuit, turn off the ignition. Disconnect the PCM connector and check continuity of the driver between the PCM and the coil. If there’s no continuity, repair the open circuit or short to ground in the circuit. If continuity is present, check resistance between ground and the ignition coil connector. There should be infinite resistance. If there isn’t, repair the short to ground in the coil control circuit.

NOTE: If the ignition coil driver signal wire isn’t open or shorted to voltage or ground and there’s no trigger signal to the coil, suspect a faulty PCM coil driver. Also keep in mind that if the PCM driver has failed, there may be a wiring problem that caused the PCM to fail. It’s a good idea to perform the above check after PCM replacement to verify there won’t be a repeat failure. If you find the engine isn’t misfiring, the coil is being triggered properly but P0351 keeps resetting, it’s possible the PCM coil monitoring system is faulty.

What does it mean?

This diagnostic code (DTC) is a generic powertrain code, meaning it applies to OBD-II equipped vehicles. Although generic, specific repair steps may vary by make/model.

The COP (coil-on-plug) ignition system is what is used on most modern engines. There is an individual coil for each cylinder that is controlled by the PCM (powertrain control module).

It eliminates the need for spark plug wires by placing the coil right above the spark plug. Two wires are dedicated to each coil. One is a battery feed usually from the power distribution center. The other wire is the PCM’s coil control circuit. The PCM grounds/ungrounds this circuit to activate or deactivate the coil. The coil control circuit is monitored by the PCM for faults.

If an open or short circuit is detected in the drive circuit for coil number 2, a P0352 may be set. Additionally, depending on the vehicle, the PCM may also shut off the fuel injector for that cylinder as well.

Symptoms

Symptoms of a P0352 DTC may include:

    MIL (Malfunction Indicator Lamp) illumination
    Engine misfire may be present or intermittent

Causes

Potential causes of a P0352 code include:

    Short to voltage or ground on the COP driver circuit
    Open in the COP driver circuit
    Loose connection at the coil or broken connector locks
    Faulty coil (COP)
    Faulty powertrain control module

Possible Solutions

Is the engine currently misfiring? If not, the problem is likely intermittent. Try testing the wiring at coil #2 and along the wiring harness to the PCM. If manipulating the wiring causes a surface misfire, repair the wiring issue. Check for a poor connection at the coil connector. Check that the harness is not misrouted or rubbing against anything. Repair if necessary.

If the engine is currently running poorly, stop the engine and disconnect the wiring connector from coil #2. Then start the engine and check for a driver signal at coil #2. Using an oscilloscope will give you a visual pattern to observe, but since most people don’t have access to one, there is a simpler way. Use a voltmeter set to the AC Hertz scale and see if there is a Hz reading between 5 and 20, which indicates the driver is operating. If there is a Hertz signal, replace ignition coil #2. It is likely faulty. If you detect no frequency signal from the PCM on the ignition coil control circuit, indicating the PCM is not grounding/ungrounding the circuit (or if there is no visible pattern on the oscilloscope if you have one), leave the coil disconnected and check for DC voltage on the drive circuit at the ignition coil connector. If there is significant voltage on this wire, there is a short somewhere. Find the short and repair it.

If there is no voltage on the drive circuit, turn the ignition off. Disconnect the PCM connector and check the continuity of the driver circuit between the PCM and the coil. If there is no continuity, repair the open circuit or short to ground in the circuit. If continuity is present, check the resistance between ground and the ignition coil connector. There should be infinite resistance. If there isn’t, repair the short to ground in the coil control circuit.

NOTE: If the ignition coil driver signal wire is not open or shorted to voltage or ground and there is no trigger signal to the coil, suspect a faulty PCM coil driver. Also keep in mind that if the PCM driver has failed, there may have been a wiring issue that caused the PCM failure. It is a good idea to perform the above check after PCM replacement to ensure there will be no repeat failure. If you find the engine is not misfiring, the coil is triggering correctly but the P0352 is continuously reset, there is a possibility the PCM coil monitoring system is faulty.

What does it mean?

This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to OBD-II equipped vehicles. Although generic, specific repair steps may vary by make/model.

The COP (coil-on-plug) ignition system is what’s used on most modern engines. There’s an individual coil for each cylinder that’s controlled by the PCM (powertrain control module).

It eliminates the need for spark plug wires by placing the coil right above the spark plug. Two wires are dedicated to each coil. One is a battery feed typically from the electrical distribution center. The other wire is the coil control circuit from the PCM. The PCM grounds/ungrounds this circuit to activate or deactivate the coil. The coil control circuit is monitored by the PCM for faults.

If an open or short circuit is detected in the control circuit for coil number 3, a P0353 may set. Additionally, depending on the vehicle, the PCM may also shut down the fuel injector for that cylinder as well.

Symptoms

Symptoms of a P0353 DTC may include:

    MIL (malfunction indicator lamp) illumination
    Engine misfire may be present or intermittent

Causes

Potential causes of a P0353 code include:

    Short to voltage or ground on COP driver circuit
    Open in COP driver circuit
    Loose connection at coil or broken connector locks
    Faulty coil (COP)
    Defective powertrain control module

Possible Solutions

Is the engine currently misfiring? If not, the problem is likely intermittent. Try testing the wiring at coil #3 and along the wiring harness to the PCM. If manipulating the wiring causes a surface misfire, repair the wiring issue. Check for poor connection at the coil connector. Verify the harness isn’t misrouted or chafing against anything. Repair if necessary.

If the engine is currently running poorly, stop the engine and disconnect the wiring connector from coil #3. Then start the engine and look for a driver signal to coil #3. Using an oscilloscope will give you a visual pattern to observe, but since most people don’t have access to one, there’s a simpler way. Use a voltmeter set to AC Hertz scale and see if there’s a Hz reading between 5-20, indicating the driver is working. If there’s a Hertz signal, replace ignition coil #3. It’s likely bad. If you detect no frequency signal from the PCM on the ignition coil control circuit indicating the PCM is grounding/ungrounding the circuit (or if there’s no visible pattern on the oscilloscope if you have one), leave the coil disconnected and check DC voltage on the trigger circuit at the ignition coil connector. If there’s significant voltage on this wire, there’s a short somewhere. Find the short and repair it.

If there’s no voltage on the trigger circuit, turn the ignition off. Disconnect the PCM connector and check continuity of the driver circuit between the PCM and the coil. If there’s no continuity, repair the open circuit or short to ground in the circuit. If continuity is present, check resistance between ground and the ignition coil connector. There should be infinite resistance. If there isn’t, repair the short to ground in the coil control circuit.

NOTE: If the ignition coil driver signal wire isn’t open or shorted to voltage or ground and there’s no trigger signal to the coil, suspect a faulty PCM coil driver. Also keep in mind that if the PCM driver has failed, there may have been a wiring issue that caused the PCM failure. It’s a good idea to perform the above check after PCM replacement to verify there won’t be a repeat failure. If you find the engine isn’t misfiring, the coil is triggering properly but P0353 keeps resetting, there’s possibility the PCM coil monitoring system is faulty.

This text explains the meaning, symptoms, possible causes, and potential solutions for error code P0354. This code is a generic powertrain diagnostic trouble code (DTC), meaning it applies to all vehicles equipped with an OBD-II system. However, specific repair steps may vary depending on the vehicle’s make and model.

Simply put, code P0354 indicates that a problem has been detected in the control circuit for the ignition coil of cylinder number 4.

Here is a breakdown of the key points:

• COP Ignition System (Coil On Plug): Most modern engines use this system, where each cylinder has its own ignition coil placed directly on top of the spark plug. This eliminates the need for spark plug wires.
• COP Coil Operation: Each coil has two main wires:
  • A DC power supply, typically from the power distribution box.
  • A control circuit from the PCM (Powertrain Control Module).
• Control by the PCM: The PCM activates and deactivates each coil by grounding (or interrupting the ground to) the control circuit.
• P0354 Error Detection: The PCM monitors the control circuit of each coil for faults. If an open (broken circuit) or a short circuit is detected in the control circuit for cylinder number 4’s coil, code P0354 may be stored.
• Potential PCM Action: Depending on the vehicle, the PCM may also disable the fuel injector for the affected cylinder (cylinder 4) in addition to storing the error code.

Common Symptoms of Code P0354:

• The MIL (Malfunction Indicator Lamp), also known as the check engine light, illuminates.
• The engine may misfire, which can be constant or intermittent.

Potential Causes of Code P0354:

• A short to voltage (the control circuit is supplied with incorrect voltage) or to ground (the control circuit is directly connected to ground) in the COP coil control circuit.
• An open (break) in the COP coil control circuit.
• A loose connection at the ignition coil or broken connector locking clips.
• A faulty ignition coil (COP) for cylinder number 4.
• A faulty Powertrain Control Module (PCM).

Possible Solutions (Suggested Diagnostic and Repair Steps):

1. Check if the engine is currently misfiring:
   • If not, the problem is likely intermittent. Try manipulating the wiring at coil number 4 and along the harness to the PCM. If this causes misfires, repair the wiring issue. Also check for poor connections at the coil connector and ensure the harness is not misrouted or chafing.
2. If the engine is currently misfiring:
   • Stop the engine and disconnect the wiring connector from coil number 4.
   • Start the engine and check for a control signal to coil number 4.
     • An oscilloscope is ideal for visualizing the signal, but if you don’t have one, use a multimeter in AC Hertz mode. A reading between 5 and 20 Hz indicates the PCM is sending a signal.
     • If there is a Hertz signal: Replace ignition coil number 4, as it is likely faulty.
     • If there is no Hertz signal: Leave the coil disconnected and check for DC voltage on the control circuit at the coil connector.
       • If there is significant voltage: There is a short to voltage somewhere in the circuit. Find and repair the short.
       • If there is no voltage: Turn the ignition off. Disconnect the PCM connector and check the continuity of the control circuit between the PCM and the coil.
         • If there is no continuity: Repair the open circuit or short to ground in the circuit.
         • If continuity is present: Check the resistance between the control circuit at the coil connector and ground. The resistance should be infinite. If not, repair the short to ground in the coil control circuit.
3. Important Note Regarding the PCM: If the coil control circuit is neither open nor shorted, and there is still no trigger signal to the coil, suspect a faulty coil driver inside the PCM. However, keep in mind that a PCM failure may have been caused by a wiring problem. Therefore, it is recommended to recheck the wiring after replacing the PCM to prevent the problem from recurring.
4. Final Check: If the engine is not misfiring, the coil is being triggered correctly, but the P0354 code continuously resets, it is possible that the coil monitoring system inside the PCM is faulty.

What does it mean?

This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to OBD-II equipped vehicles. Although generic, specific repair steps may vary by make/model.

The COP (coil-on-plug) ignition system is what’s used on most modern engines. There’s an individual coil for each cylinder that’s controlled by the PCM (powertrain control module).

It eliminates the need for spark plug wires by placing the coil right above the spark plug. Two wires are dedicated to each coil. One is a battery feed typically from the electrical distribution center. The other wire is the coil control circuit from the PCM. The PCM grounds/ungrounds this circuit to activate or deactivate the coil. The coil control circuit is monitored by the PCM for faults.

If an open or short circuit is detected in the #5 coil control circuit, a P0355 may set. Additionally, depending on the vehicle, the PCM may also shut down the cylinder’s fuel injector as well.

Symptoms

Symptoms of a P0355 DTC may include:

• MIL (malfunction indicator lamp) illumination
• Engine misfire may be present or intermittent

Causes

Potential causes of a P0355 code include:

• Short to voltage or ground on COP control circuit
• Open in COP control circuit
• Loose connection at coil or broken connector locks
• Faulty coil (COP)
• Defective powertrain control module

Possible Solutions

Is the engine currently misfiring? If not, the problem is likely intermittent. Try testing the wiring at coil #5 and along the wiring harness to the PCM. If manipulating the wiring causes a surface misfire, repair the wiring issue. Check for poor connection at the coil connector. Verify the harness isn’t improperly routed or rubbing against anything. Repair as necessary.

If the engine is currently running rough, stop the engine and disconnect the wiring connector from coil #5. Then start the engine and check whether the driver is sending a signal to coil #5. Using an oscilloscope will give you a visual pattern to observe, but since most people don’t have access to one, there’s a simpler way. Use a voltmeter on the AC Hertz scale and see if there’s a Hz reading between 5 and 20, which indicates the driver is working. If there’s a Hertz signal, replace ignition coil #5. It’s probably bad. If you detect no frequency signal from the PCM on the ignition coil control circuit, indicating the PCM is not grounding/ungrounding the circuit (or if there’s no visible pattern on the oscilloscope if you have one), leave the coil disconnected and check DC voltage on the control circuit at the ignition coil connector. If there’s significant voltage on this wire, there’s a short somewhere. Find the short and repair it.

If there’s no voltage on the control circuit, turn off the ignition. Disconnect the PCM connector and check continuity of the driver between the PCM and the coil. If there’s no continuity, repair the open circuit or short to ground in the circuit. If continuity is present, check resistance between ground and the ignition coil connector. There should be infinite resistance. If there isn’t, repair the short to ground in the coil control circuit.

NOTE: If the ignition coil driver signal wire isn’t open or shorted to voltage or ground and there’s no trigger signal to the coil, suspect a faulty PCM coil driver. Also keep in mind that if the PCM driver has failed, there may be a wiring problem that caused the PCM failure. It’s a good idea to perform the above check after PCM replacement to verify there won’t be a repeat failure. If you find the engine hasn’t misfired, the coil is triggering properly but P0355 is continually resetting, it’s possible the PCM coil monitoring system is faulty.

What does it mean?

This diagnostic code (DTC) is a generic powertrain code, meaning it applies to vehicles equipped with OBD-II. Although generic, specific repair steps may vary by make/model.

The COP (coil-on-plug) ignition system is what’s used on most modern engines. There’s an individual coil for each cylinder that’s controlled by the PCM (powertrain control module).

It eliminates the need for spark plug wires by placing the coil right above the spark plug. Two wires are dedicated to each coil. One is a battery supply typically from the power distribution center. The other wire is the coil control circuit from the PCM. The PCM grounds/ungrounds this circuit to activate or deactivate the coil. The coil control circuit is monitored by the PCM for faults.

If an open or short circuit is detected in coil #6 control circuit, a P0356 may set. Additionally, depending on the vehicle, the PCM may also shut off the cylinder’s fuel injector as well.

Symptoms

Symptoms of a P0356 DTC may include:

MIL (malfunction indicator lamp) illumination
Engine misfire may be present or intermittent

Causes

Potential causes of a P0356 code include:

Short to voltage or ground on COP driver circuit
Open in COP driver circuit
Loose connection at coil or broken connector locks
Bad coil (COP)
Faulty powertrain control module

Possible Solutions

Is the engine currently misfiring? If not, the problem is likely intermittent. Try testing the wiring at coil #6 and along the wiring harness to the PCM. If manipulating the wiring causes a surface misfire, repair the wiring issue. Check for poor connection at coil connector. Check that harness isn’t misrouted or chafing against anything. Repair if necessary.

If engine is currently running rough, stop engine and disconnect wiring connector from coil #6. Then start engine and check for driver signal at coil #6. Using a scope will give you a visual pattern to observe, but since most people don’t have access to one, there’s a simpler way. Use a voltmeter on AC Hertz scale and see if there’s a Hz reading between 5-20, indicating the driver is working. If there’s a Hertz signal, replace ignition coil #6. It’s probably bad. If you detect no frequency signal from PCM on ignition coil control circuit, indicating PCM isn’t grounding/ungrounding the circuit (or if there’s no visible pattern on oscilloscope if you have one), leave coil disconnected and check DC voltage on trigger circuit at ignition coil connector. If there’s significant voltage on this wire, there’s a short somewhere. Find the short and repair it.

If there’s no voltage on trigger circuit, turn ignition off. Disconnect PCM connector and check continuity of driver between PCM and coil. If there’s no continuity, repair open circuit or short to ground in circuit. If continuity is present, check resistance between ground and ignition coil connector. There should be infinite resistance. If there isn’t, repair short to ground in coil control circuit.

NOTE: If ignition coil driver signal wire isn’t open or shorted to voltage or ground and there’s no trigger signal to coil, suspect faulty PCM coil driver. Also keep in mind that if PCM driver has failed, there may have been a wiring problem that caused PCM failure. It’s a good idea to perform above check after PCM replacement to verify there won’t be repeat failure. If you find engine isn’t misfiring, coil is triggering properly but P0356 keeps resetting, it’s possible PCM coil monitoring system is faulty.

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What does it mean?

This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to vehicles equipped with OBD-II. Although generic, specific repair steps may vary by brand/model.

The COP (coil-on-plug) ignition system is what is used on most modern engines. There is an individual coil for each cylinder that is controlled by the PCM (powertrain control module).

It eliminates the need for spark plug wires by placing the coil right above the spark plug. Two wires are dedicated to each coil. One is a battery supply usually from the electrical distribution center. The other wire is the coil control circuit from the PCM. The PCM grounds/ungrounds this circuit to activate or deactivate the coil. The coil control circuit is monitored by the PCM for faults.

If an open or short circuit is detected in the #7 coil control circuit, a P0357 may set. Additionally, depending on the vehicle, the PCM may also shut off the fuel injector for that cylinder as well.

Symptoms

Symptoms of a P0357 DTC may include:

• MIL (malfunction indicator lamp) illumination
• Engine misfire may be present or intermittent

Causes

Potential causes of a P0357 code include:

• Short circuit to voltage or ground on the COP driver circuit
• Open in the COP driver circuit
• Loose connection at the coil or broken connector locks
• Faulty coil (COP)
• Defective powertrain control module

Possible Solutions

Is the engine currently misfiring? If not, the problem is likely intermittent. Try testing the wiring at coil #7 and along the wiring harness to the PCM. If manipulating the wiring causes a misfire to surface, repair the wiring issue. Check for poor connection at the coil connector. Verify the harness is not improperly routed or rubbing against anything. Repair as necessary.

If the engine is currently running poorly, stop the engine and disconnect the wiring connector from coil #7. Then start the engine and look for a driver signal at coil #7. Using an oscilloscope will give you a visual pattern to observe, but since most people don’t have access to one, there is a simpler way. Use a voltmeter set to the AC Hertz scale and see if there is a Hz reading between 5 and 20, indicating the driver is operating. If there is a Hertz signal, replace ignition coil #7. It is likely faulty. If you detect no frequency signal from the PCM on the ignition coil control circuit, indicating the PCM is not grounding/ungrounding the circuit (or if there is no visible pattern on the oscilloscope if you have one), leave the coil disconnected and check for DC voltage on the control circuit at the ignition coil connector. If there is significant voltage on this wire, there is a short somewhere. Find the short and repair it.

If there is no voltage on the control circuit, turn the ignition off. Disconnect the PCM connector and check the continuity of the driver circuit between the PCM and the coil. If there is no continuity, repair the open circuit or short to ground in the circuit. If continuity is present, check the resistance between ground and the ignition coil connector. There should be infinite resistance. If there isn’t, repair the short to ground in the coil control circuit.

NOTE: If the ignition coil driver signal wire is not open or shorted to voltage or ground and there is no trigger signal to the coil, suspect a faulty PCM coil driver. Also keep in mind that if the PCM driver has failed, there may have been a wiring issue that caused the PCM failure. It is a good idea to perform the above check after PCM replacement to verify there will be no repeat failure. If you find the engine is not misfiring, the coil is being triggered correctly but the P0357 is continuously reset, there is the possibility that the PCM coil monitoring system is faulty.

What does it mean?

This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to OBD-II equipped vehicles. Although generic, specific repair steps may vary by make/model.

The COP (coil-on-plug) ignition system is what’s used on most modern engines. There is an individual coil for each cylinder that is controlled by the PCM (powertrain control module).

It eliminates the need for spark plug wires by placing the coil right above the spark plug. Two wires are dedicated to each coil. One is a battery feed typically from the electrical distribution center. The other wire is the coil control circuit from the PCM. The PCM grounds/ungrounds this circuit to activate or deactivate the coil. The coil control circuit is monitored by the PCM for faults.

If an open or short circuit is detected in the #8 coil control circuit, a P0358 may set. Additionally, depending on the vehicle, the PCM may also shut down the fuel injector for that cylinder as well.

Symptoms

Symptoms of a P0358 DTC may include:

MIL (malfunction indicator lamp) illumination
Engine misfire may be present or intermittent

Causes

Potential causes of a P0358 code include:

Short to voltage or ground on COP control circuit
Open in COP control circuit
Loose connection at coil or broken connector locks
Faulty coil (COP)
Faulty powertrain control module

Possible solutions

Is the engine currently misfiring? If not, the problem is likely intermittent. Try testing the wiring at coil #8 and along the wiring harness to the PCM. If manipulating the wiring causes a misfire to surface, repair the wiring issue. Check for poor connection at the coil connector. Check that the harness isn’t improperly routed or rubbing against anything. Repair as necessary.

If the engine is currently running rough, stop the engine and disconnect the wiring connector from coil #8. Then start the engine and check whether the driver is sending a signal to coil #8. Using an oscilloscope will give you a visual pattern to observe, but since most people don’t have access to one, there’s a simpler way. Use a voltmeter on the AC Hertz scale and see if there’s a Hz reading between 5 and 20, which indicates the driver is working. If there is a Hertz signal, replace ignition coil #8. It’s probably bad. If you detect no frequency signal from the PCM on the ignition coil control circuit, indicating the PCM is not grounding/ungrounding the circuit (or if there’s no visible pattern on the oscilloscope if you have one), leave the coil disconnected and check DC voltage on the control circuit at the ignition coil connector. If there’s significant voltage on this wire, there’s a short somewhere. Find the short and repair it.

If there’s no voltage on the control circuit, turn off the ignition. Disconnect the PCM connector and check continuity of the driver between the PCM and the coil. If there’s no continuity, repair the open circuit or short to ground in the circuit. If continuity is present, check resistance between ground and the ignition coil connector. There should be infinite resistance. If there isn’t, repair the short to ground in the coil control circuit.

NOTE: If the ignition coil driver signal wire is not open or shorted to voltage or ground and there’s no trigger signal to the coil, suspect a faulty PCM coil driver. Also keep in mind that if the PCM driver has failed, there may be a wiring problem that caused the PCM failure. It’s a good idea to perform the above check after PCM replacement to verify there won’t be a repeat failure. If you find the engine isn’t misfiring, the coil is triggering properly but P0358 keeps resetting, there’s the possibility that the PCM coil monitoring system is faulty.

What does it mean?

This diagnostic trouble code (DTC) is a generic powertrain code, meaning it applies to OBD-II equipped vehicles. Although generic, specific repair steps may vary by make/model.

The COP (coil-on-plug) ignition system is what’s used on most modern engines. There’s an individual coil for each cylinder that’s controlled by the PCM (powertrain control module).

It eliminates the need for spark plug wires by placing the coil right above the spark plug. Two wires are dedicated to each coil. One is a battery feed typically from the electrical distribution center. The other wire is the coil control circuit from the PCM. The PCM grounds/ungrounds this circuit to activate or deactivate the coil. The coil control circuit is monitored by the PCM for faults.

If an open or short circuit is detected in the #9 coil control circuit, a P0359 may set. Additionally, depending on the vehicle, the PCM may also shut down the fuel injector for that cylinder as well.

Symptoms

Symptoms of a P0359 DTC may include:

• MIL (malfunction indicator lamp) illumination
• Engine misfire may be present or intermittent

Causes

Potential causes of a P0359 code include:

• Short to voltage or ground on COP driver circuit
• Open in COP driver circuit
• Loose connection at coil or broken connector locks
• Faulty coil (COP)
• Defective powertrain control module

Possible Solutions

Is the engine currently misfiring? If not, the problem is likely intermittent. Try testing the wiring at coil #9 and along the wiring harness to the PCM. If manipulating the wiring causes a surface misfire, repair the wiring issue. Check for poor connection at the coil connector. Verify the harness isn’t improperly routed or rubbing against anything. Repair as necessary.

If the engine is currently running rough, stop the engine and disconnect the wiring connector from coil #9. Then start the engine and check whether the driver is sending a signal to coil #9. Using an oscilloscope will give you a visual pattern to observe, but since most people don’t have access to one, there’s a simpler way. Use a voltmeter on the AC Hertz scale and see if there’s a Hz reading between 5 and 20, which indicates the driver is working. If there’s a Hertz signal, replace ignition coil #9. It’s probably bad. If you detect no frequency signal from the PCM on the ignition coil control circuit, indicating the PCM is grounding/ungrounding the circuit (or if there’s no visible pattern on the oscilloscope if you have one), leave the coil disconnected and check DC voltage on the control circuit at the ignition coil connector. If there’s significant voltage on this wire, there’s a short somewhere. Find the short and repair it.

If there’s no voltage on the control circuit, turn off the ignition. Disconnect the PCM connector and check continuity of the driver circuit between the PCM and the coil. If there’s no continuity, repair the open circuit or short to ground in the circuit. If continuity is present, check resistance between ground and the ignition coil connector. There should be infinite resistance. If there isn’t, repair the short to ground in the coil control circuit.

NOTE: If the ignition coil driver signal wire isn’t open or shorted to voltage or ground and there’s no trigger signal to the coil, suspect a faulty PCM coil driver. Also keep in mind that if the PCM driver fails, there may be a wiring problem that caused the PCM failure. It’s a good idea to perform the above check after PCM replacement to verify there won’t be a repeat failure. If you find the engine isn’t misfiring, the coil is triggering properly but P0359 is continuously resetting, there’s the possibility that the PCM coil monitoring system is faulty.

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