P2062 Power Supply Control Circuit Reducer / Regeneration / Open

How Serious Is This DTC?

A stored P2062 code should be considered serious and addressed as soon as possible. The SCR system could be disabled because of this. Catalyst damage could occur if the conditions that contributed to the code being stored are not corrected in a timely manner.

What Are Some Symptoms of the Code?

Symptoms of a P2062 trouble code may include:

Reduced fuel efficiency
Excessive black smoke from vehicle exhaust
Decreased engine performance
Other SCR-related codes

What Are Some Common Causes of the Code?

Causes of this code may include:

Faulty reductant supply pump (overload)
Open or shorted circuits in the reductant supply control
Faulty SCR controller/PCM or programming error

What Are the P2062 Troubleshooting Steps?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P2062 code.

You can use your vehicle information source to locate a technical service bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms. If you find one, it could provide helpful diagnostic information.

Use the scanner (connected to the vehicle’s diagnostic connector) to retrieve all stored codes and relevant freeze frame data. It’s a good idea to record this information before clearing the codes, then test drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at that point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to the code being stored may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, the next step in your diagnosis will require you to search your vehicle information source for diagnostic flowcharts, connector pinout diagrams, connector face views, and component testing procedures/specifications.

Step 1

Use the DVOM to test the reductant tank supply pump according to manufacturer specifications. Components that do not test within allowable parameters should be considered faulty.

Step 2

Use your vehicle diagnostic information source and DVOM to test the reductant supply pump voltage (typically battery voltage) with the pump activated. If current conditions don’t allow automatic activation, use the scanner to manually activate the pump.

Step 3

If the reductant supply pump is functional, use the DVOM to test the input and output signal circuits of the fuse panel, PCM, and ignition switch. Disconnect all controllers before using the DVOM for testing.

Excessive reductant supply pump control voltage codes are often attributed to wiring failures (to voltage)

P2063 – Lower Reducer/Regeneration Power Supply Control Circuit

How serious is this DTC?

A stored P2063 code should be considered serious and addressed as quickly as possible. The SCR system could be disabled because of this. Catalyst damage could occur if the conditions that contributed to the code being stored are not corrected in a timely manner.

What are some of the symptoms of the code?

Symptoms of a P2063 trouble code may include:

Reduced fuel efficiency
Excessive black smoke from vehicle exhaust
Decreased engine performance
Other SCR-related codes

What are some common causes of the code?

Causes of this code may include:

Faulty reductant supply pump (overload)
Open or shorted circuits in reductant supply control
Faulty SCR controller/PCM or programming error

What are the troubleshooting steps for P2063?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P2063 code.

Use the scanner (connected to the vehicle’s diagnostic connector) to retrieve all stored codes and relevant freeze frame data. It’s a good idea to record this information before clearing the codes, then test the vehicle until the PCM enters readiness mode or the code resets.

Step 1

Use the DVOM to test the reductant tank supply pump according to manufacturer specifications. Components that do not test within allowed maximum parameters should be considered faulty.

Step 2

Use your vehicle diagnostic information source and the DVOM to test the reductant supply pump voltage (typically battery voltage) with the pump activated. If current conditions don’t allow automatic activation, use the scanner to manually activate the pump.

Step 3

Excessive reductant supply pump control voltage codes are often attributed to wiring failures (to voltage)

P2064 – High Reducer/Regeneration Power Supply Control Circuit

How Serious Is This DTC?

A stored P2064 code should be considered serious and addressed as soon as possible. The SCR system could be disabled because of this. Catalyst damage could occur if the conditions that contributed to the code being stored are not corrected in a timely manner.

What Are Some of the Symptoms of the Code?

Symptoms of a P2064 trouble code may include:

Reduced fuel efficiency
Excessive black smoke from the vehicle’s exhaust
Decreased engine performance
Other SCR-related codes

What Are Some Common Causes of the Code?

Causes of this code may include:

Faulty reductant supply pump (overload)
Open or shorted circuits in the reductant supply control
Faulty SCR controller/PCM or programming error

What Are the P2064 Troubleshooting Steps?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P2064 code.

Use the scanner (connected to the vehicle’s diagnostic connector) to retrieve all stored codes and relevant freeze frame data. It’s a good idea to record this information before clearing the codes, then test the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at that point, the code is intermittent and may be much harder to diagnose. If this is the case, the conditions that contributed to the code being stored may need to worsen before an accurate diagnosis can be made.

Step 1

Use the DVOM to test the reductant tank supply pump according to manufacturer specifications. Components that do not test within allowable parameters should be considered faulty.

Step 2

Use your vehicle diagnostic information source and the DVOM to test the reductant supply pump voltage (typically battery voltage) with the pump activated. If current conditions don’t allow for automatic activation, use the scanner to manually activate the pump.

Step 3

Excessive reductant supply pump control voltage codes are often attributed to wiring failures (to voltage)

P2065 Fuel Level Sensor B Circuit Malfunction

Severity and Symptoms

Severity depends on the failure. In case of mechanical failure; severe. In case of electrical failure, less severe, which the PCM can compensate for. Compensation typically means the fuel gauge reads empty or full all the time.

Symptoms of an engine code P2065 may include:

Malfunction Indicator Lamp (MIL) illuminated
Perceived decrease in fuel economy
Reduced distance to empty mileage
Incorrect fuel level on the gauge in the instrument cluster – always reads incorrectly

Potential Causes

Typically, the causes for this code to set are:

Open in the signal circuit to the FLS sensor – possible
Short to voltage in the signal circuit to the FLS sensor – possible
Short to ground in the signal circuit to the FLS sensor – possible
Failed FLS sensor/sensing arm mechanically stuck – probable
Failed PCM – unlikely

Diagnostic and Repair Procedures

A good starting point is always to search for a Technical Service Bulletin (TSB) for your specific vehicle. The vehicle manufacturer may have a PCM flash/reprogramming to address this issue, and it’s worth checking before discovering you’ve taken a long/wrong path.

A good example of this is on Ford products where an aftermarket remote start system was installed. This can cause a false code to set. There is a TSB covering this topic and it should be followed to properly diagnose this condition. Auxiliary fuel tanks are also covered in this TSB. Gravity-feed tanks are not recommended for use on these systems and when refueling Ford trucks. It is recommended to fill the main tanks with the ignition switch in the off position.

Next, locate the Fuel Level Sensor (FLS) on your specific vehicle. This sensor is typically mounted in the fuel tank or may even be on top of the fuel tank module/fuel pump. Once located, visually inspect the connector and wiring. Look for scratches, rubbing, bare wires, burns, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they appear burned or have a greenish tint indicating corrosion. Use electrical contact cleaner and a plastic bristle brush if terminal cleaning is necessary. Let it dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from memory and see if the P2065 code returns. If not, the connections were likely your problem.

This is the most common area of concern for this code, as fuel tank connections have the highest number of corrosion issues.

If the P2065 code returns, we will need to test the FLS sensor and its associated circuits. With the key off, disconnect the electrical connector from the FLS sensor. Connect a black wire from the Digital Volt Ohm Meter (DVOM) to the ground or low reference terminal at the FLS sensor wiring harness connector. Connect the red wire from the DVOM to the signal terminal at the FLS sensor wiring harness connector. Turn the key to the engine off position. Check manufacturer specifications; the voltmeter should read 12 volts or 5 volts. If the voltage is incorrect, repair the power or ground wire or replace the PCM.

If the previous test passed, connect one wire of an ohmmeter to the sensor’s signal terminal and the other wire to the sensor’s ground or low reference terminal. The ohmmeter reading should not be zero ohms nor infinite. Check manufacturer specifications for sensor resistance to accurately test resistance at fuel level (1/2 tank of fuel may read 80 ohms). If the ohmmeter readings fail, replace the FLS.

If all previous tests passed and you continue to get a P2065, this would most likely indicate a faulty FLS sensor, although a faulty PCM cannot be ruled out until the FLS sensor has been replaced. When in doubt, seek assistance from a qualified automotive diagnostician. PCMs must be programmed or calibrated to the vehicle to be installed properly.

P2066 Fuel Level Sensor B Circuit Range / Performance

Severity and Symptoms

The severity depends on the failure. In case of mechanical failure: severe. In case of electrical failure, less severe, which the PCM can compensate for. Compensation typically means the fuel gauge shows empty or full all the time.

Symptoms of an engine code P2066 may include:

Malfunction Indicator Lamp (MIL) illuminated
Perceived decrease in fuel economy
Reduced distance to empty mileage
Incorrect fuel level on the gauge in the instrument cluster – always reads incorrectly

Potential Causes

Generally, the causes for this code to set are as follows:

Open in the signal circuit to the FLS sensor – possible
Short to voltage in the signal circuit to the FLS sensor – possible
Short to ground in the signal circuit to the FLS sensor – possible
Failed FLS sensor / sensing arm mechanically stuck – probable
Failed PCM – unlikely

Diagnostic and Repair Procedures

Next, locate the Fuel Level Sensor (FLS) on your specific vehicle. This sensor is usually mounted in the fuel tank or may even be on top of the fuel tank module/fuel pump. Once located, visually inspect the connector and wiring. Look for scratches, rubbing, bare wires, burns, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they appear burnt or have a greenish tint indicating corrosion. Use electrical contact cleaner and a plastic bristle brush if terminal cleaning is needed. Allow to dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from memory and see if the P2066 code returns. If not, the connections were likely your problem.

This is the most common area of concern for this code, as fuel tank connections have the highest incidence of corrosion issues.

If the P2066 code returns, we will need to test the FLS sensor and its associated circuits. With the key off, disconnect the electrical connector from the FLS sensor. Connect a black wire from the Digital Volt Ohm Meter (DVOM) to the ground or low reference terminal at the FLS sensor wiring harness connector. Connect the red wire from the DVOM to the signal terminal at the FLS sensor wiring harness connector. Turn the key to the engine off position. Check manufacturer specifications; the voltmeter should read 12 volts or 5 volts. If the voltage is incorrect, repair the power or ground wire or replace the PCM.

If the previous test was successful, connect one wire of an ohmmeter to the sensor’s signal terminal and the other wire to the sensor’s ground or low reference terminal. The ohmmeter reading should not be zero ohms or infinite. Check manufacturer specifications for sensor resistance to accurately test the resistance at fuel level (1/2 tank of fuel may read 80 ohms). If the ohmmeter readings do not pass, replace the FLS.

If all previous tests were successful and you continue to get a P2066, this would most likely indicate a faulty FLS sensor, although a faulty PCM cannot be ruled out until the FLS sensor has been replaced. If in doubt, seek assistance from a qualified automotive diagnostician. PCMs must be programmed or calibrated to the vehicle to be installed correctly.

P2067 Fuel Level Sensor B Circuit Low Input

Severity and Symptoms

The severity is generally not too serious. Because it’s an electrical failure, the PCM can compensate for it. Compensation typically means the fuel gauge reads empty or full all the time.

Symptoms of engine code P2067 may include:

Malfunction Indicator Light (MIL) illuminated
Perceived decrease in fuel economy
Reduced distance to empty mileage
Incorrect fuel level on gauge in instrument cluster – always reads inaccurately

Potential Causes

Typically, the causes for this code to set are:

Short to ground in signal circuit to FLS sensor – possible
Failed FLS sensor/internal short circuit – probable
Failed PCM – unlikely

Diagnostic and Repair Procedures

A good starting point is always searching for a Technical Service Bulletin (TSB) for your specific vehicle. The vehicle manufacturer may have a PCM flash/reprogramming to address this issue, and it’s worth checking before discovering you’ve taken a long/wrong path.

A good example of this is on Ford products where an aftermarket remote start system was installed. This can cause a false code to set. There is a TSB covering this topic that should be followed to properly diagnose this condition. Auxiliary fuel tanks are also covered in this TSB. Gravity-fed tanks are not recommended for use on these systems and when refueling Ford trucks. It’s recommended to fill main tanks with ignition switch in off position.

Next, locate the Fuel Level Sensor (FLS) on your specific vehicle. This sensor is typically mounted in the fuel tank or possibly even on top of the fuel tank module/fuel pump. Once located, visually inspect the connector and wiring. Look for scratches, rubbing, bare wires, burns, or melted plastic. Separate the connector and carefully inspect the terminals (metal parts) inside the connector. See if they appear burned or have a greenish tint indicating corrosion. Use electrical contact cleaner and a plastic bristle brush if terminal cleaning is needed. Let dry and apply electrical grease where terminals make contact.

If you have a scan tool, clear diagnostic codes from memory and see if P2067 code returns. If not, connections were likely your problem.

This is the most common area of concern for this code, as fuel tank connections have the highest incidence of corrosion problems.

If P2067 code returns, we’ll need to test the FLS sensor and its associated circuits. With key off, disconnect electrical connector from FLS sensor. Connect black wire of digital voltmeter (DVOM) to ground or low reference terminal at FLS sensor wiring harness connector. Connect red wire of digital voltmeter to signal terminal at FLS sensor wiring harness connector. Turn key to engine off position. Check manufacturer specifications; voltmeter should read 12 volts or 5 volts. If voltage is incorrect, repair power or ground wire or replace PCM.

If previous test passed, connect one ohmmeter wire to FLS sensor signal terminal and other wire to sensor ground or low reference terminal. Ohmmeter reading should not equal zero ohms nor be infinite. Check manufacturer specifications for sensor resistance to accurately test fuel level resistance (1/2 fuel tank may read 80 ohms). If ohmmeter readings fail, replace FLS.

If all previous tests passed and you continue to get P2067, this would most likely indicate a faulty FLS sensor, though a faulty PCM cannot be ruled out until FLS sensor has been replaced. When in doubt, seek assistance from a qualified automotive diagnostician. PCMs must be programmed or calibrated to the vehicle to be properly installed.

P2068 High Input in Fuel Level Sensor B Circuit

Symptoms

Symptoms of a DTC P2068 may include:

MIL (Malfunction Indicator Light) illumination
Fuel gauge may fluctuate abnormally or read empty or full
Fuel warning light may come on and trigger an alarm

Causes

Potential causes of a P2068 code include:

Signal circuit to fuel sender is open or shorted to B+ (battery voltage)
Ground circuit is open, or ground path may have high resistance due to rust or missing ground strap on fuel tank
Damage to fuel tank could cause issues in fuel level circuit
There is an open in fuel level sensor resistor to ground
Dashboard cluster may be faulty
Less likely is the possibility of PCM, BCM, or fuel pump module failure

Possible Solutions

Fuel pump senders typically last the lifespan of the fuel pump. So if you have this code, perform a visual inspection of the fuel tank and wiring harness. Look for tank damage indicating an impact that may have damaged the fuel pump or sender. Check for missing ground strap or rusty ground where the fuel tank connects to the chassis. Ensure the wiring harness connector is not damaged. Repair as needed. Identify the type of system you have and verify that fuel level sensor voltage is present at the fuel pump wiring harness. If not, repair the open or shorted wire.

Performing a voltage drop test on the ground circuit can determine if there is a high-resistance path in the ground circuit. You can perform this using a voltmeter by connecting one lead to the battery ground terminal and the other to the fuel level sensor ground in the tank. Turn the key (preferably with engine running). Ideally, it should be 100 millivolts or less (0.1 volt). Anything approaching 1 volt indicates a current or developing problem. Repair/clean the fuel level sensor ground as needed. It’s not impossible for the instrument cluster to have failed internally or on the circuit board (if applicable). These are very difficult for a layperson to test. But if you have access to a wiring diagram, you may be able to remove the cluster and see damaged circuitry if it’s on the circuit board, otherwise you’ll need a scan tool that can communicate with the instrument cluster.

A simple way to test the fuel level circuit is to provide a good ground to the fuel level sensor at the fuel tank connector. With the key on, the fuel gauge should go to one extreme or the other. Completely removing the ground path should result in the opposite. If the gauge responds, you know the wiring providing voltage and ground to the fuel level sensor is good and the instrument cluster is likely correct. The probable suspect would be the fuel level sensor itself. It may be necessary to remove the fuel tank to access the fuel pump module inside. PCM or BCM (Body Control Module) failure is not impossible but highly unlikely. Don’t suspect these first.

Fuel Level Sensor B Circuit Intermittent

Severity and Symptoms

Severity depends on the failure. In case of mechanical failure: severe. In case of electrical failure, less severe, which the PCM can compensate for. Compensation typically means the fuel gauge reads empty or full all the time.

Symptoms of an engine code P2069 may include:

Malfunction Indicator Light (MIL) illuminated
Perceived decrease in fuel economy
Reduced distance to empty mileage
Incorrect fuel level on the gauge in the instrument cluster – always reads incorrectly

Potential Causes

Typically, the causes for this code to set are as follows:

Intermittent open in the signal circuit to the FLS sensor – possible
Intermittent short to voltage in the signal circuit to the FLS sensor – possible
Intermittent short to ground in the signal circuit to the FLS sensor – possible
Failed FLS sensor/float arm mechanically stuck – probable
Failed PCM – unlikely

Diagnostic and Repair Procedures

Next, locate the Fuel Level Sensor (FLS) on your specific vehicle. This sensor is usually mounted in the fuel tank or possibly even on top of the fuel tank module/fuel pump. Once located, visually inspect the connector and wiring. Look for scratches, rubbing, bare wires, burns, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they appear burnt or have a greenish tint indicating corrosion. Use electrical contact cleaner and a plastic bristle brush if terminal cleaning is necessary. Let it dry and apply electrical grease where the terminals make contact.

If you have a scan tool, clear the diagnostic codes from memory and see if the P2069 code returns. If it does not, the connections were likely your problem.

This is the most common area of concern for this code, as fuel tank connections have the highest number of corrosion issues.

If the P2069 code returns, we will need to test the FLS sensor and its associated circuits. With the key off, disconnect the electrical connector from the FLS sensor. Connect a black wire from the Digital Voltmeter (DVOM) to the ground or low reference terminal at the FLS sensor wiring harness connector. Connect the red wire from the Digital Voltmeter to the signal terminal at the FLS sensor wiring harness connector. Turn the key to the engine off position. Check manufacturer specifications; the voltmeter should read 12 volts or 5 volts. Wiggle the connections to see if they change. If the voltage is incorrect, repair the power or ground wire or replace the PCM.

If the previous test was successful, connect one wire of an ohmmeter to the signal terminal of the FLS sensor and the other wire to the ground or low reference terminal of the sensor. The ohmmeter reading should not be zero ohms nor infinite. Check manufacturer specifications for sensor resistance to accurately test resistance at fuel level (1/2 tank of fuel may read 80 ohms). Wiggle the fuel level sensor connector while monitoring the resistance. If the ohmmeter readings do not pass, replace the FLS.

If all previous tests have passed and you continue to get a P2069, this would most likely indicate a faulty FLS sensor, although a faulty PCM cannot be ruled out until the FLS sensor has been replaced. If in doubt, seek assistance from a qualified automotive diagnostician. PCMs must be programmed or calibrated to the vehicle to be installed correctly.

P206A – Reductant Quality Sensor Circuit

P206A Possible Causes

Defective Reductant Quality Sensor
Reductant Quality Sensor Harness is Open or Shorted
Poor Reductant Quality Sensor Circuit Quality

What Does It Mean?

How to Fix Code P206A

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P206A Possible Symptoms

Check Engine Light On (or Service Engine Soon Warning Light)

P206A Meaning

The Reductant Quality Sensor Circuit is the generic description for code P206A, but the manufacturer may have a different description. We currently have no further information about the OBDII P206A code.

P206B – Reductant Quality Sensor Circuit Range / Performance

P206B Possible Causes

Faulty Reductant Quality Sensor
Reductant Quality Sensor Harness is open or shorted
Reductant Quality Sensor Circuit poor electrical connection

What Does It Mean?

How to Fix Code P206B

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P206B Possible Symptoms

Engine Light On (or Service Engine Soon Warning Light)

P206B Meaning

Reductant Quality Sensor Circuit Range/Performance is the generic description for the P206B code, but the manufacturer may have a different description.