How severe is this DTC?

I would say rather severe. In the field, we refer to a lack of fuel in the burned mixture as a “lean” condition. When your engine is idling, you risk causing extreme damage to the engine in the short and long term. With this in mind, always follow your engine maintenance. There needs to be some diligence here, so let’s keep our engines running smoothly and efficiently. After all, they pull our weight to get us around every day.

What are some of the symptoms of the code?

Symptoms of a P2151 trouble code may include:

• Irregular engine performance
• Misfire
• Reduced fuel economy
• Irregular idle
• Excessive smoke
• Engine noise(s)
• Lack of power
• Unable to climb steep hills
• Reduced throttle response

What are some common causes of the code?

Causes

of this P2151 fuel injector group supply voltage code may include:

• Faulty or damaged fuel injector(s)
• Damaged wiring harness
• Internal wiring malfunction
• Internal ECM problem
• Connector issue

What are the troubleshooting steps for P2151?

Basic Step #1

The first recommended step is to locate the “group” of sensors that the manufacturer refers to. With this information, you can then find the physical location of the injector(s) and their circuits. This may involve removing many covers and/or engine components to visually access (if possible). Be sure to inspect the harness for short circuits to other power wires. Any worn insulation should be properly repaired with a shrink tube to avoid further and/or future issues.

Basic Step #2

Sometimes water and/or fluids can get “trapped” in the valleys where the injectors are installed. This increases the chances of the sensor connectors, among other electrical connections, corroding at a faster rate than normal. Make sure everything is as expected and that the connector tabs seal the connection properly. Feel free to use an electrical contact cleaner to ensure everything connects and disconnects smoothly, not to mention the increased electrical connectivity in the connections with the use of this product.

Basic Step #3

Check the circuit integrity by following the troubleshooting steps provided by your specific vehicle’s service manual. An example is to disconnect the supply voltage circuit from the ECM and the fuel injector, then using your multimeter, determine whether the wires are in good working order or not.

A test I like to do to quickly determine if there is an open in a particular wire that would help with the P2151 code is to perform a “continuity test.” Set your multimeter to RESISTANCE (aka ohm, impedance, etc.), touch one end to one end of the circuit and the other end to the other end. Any value higher than desired may indicate a problem in the circuit. Any issue here will need to be determined by tracing the particular wire you are diagnosing.

How severe is this DTC?

I would say rather severe. In the field, we call a lack of fuel in the burned mixture a “lean” condition. When your engine is idling, you risk causing extreme damage to the engine in the short and long term. With this in mind, always follow your engine maintenance. There must be some diligence here, so let’s keep our engines running smoothly and efficiently. After all, they pull our weight to transport us daily.

What are some of the symptoms of the code?

Symptoms of a P2152 fault code may include:

• Irregular engine performance
• Misfire
• Reduced fuel economy
• Irregular idle
• Excessive smoke
• Engine noise(s)
• Lack of power
• Unable to climb steep hills
• Reduced throttle response

What are some common causes of the code?

Causes of this P2152 fuel injector group supply voltage code may include:

• Faulty or damaged fuel injector(s)
• Damaged wiring harness
• Internal wiring malfunction
• Internal ECM problem
• Connector issue

What are the P2152 troubleshooting steps?

Basic Step #1

The first recommended step is to locate the “group” of sensors that the manufacturer refers to. With this information, you can then find the physical location of the injector(s) and their circuits. This may involve removing many covers and/or engine components to visually access them (if possible). Be sure to inspect the wiring harness for broken wires. Any worn insulation should be properly repaired with shrink tubing to prevent further and/or future issues.

Basic Step #2

Sometimes water and/or fluids can be “trapped” in the valleys where the injectors are installed. This increases the chances of the sensor connectors, among other electrical connections, corroding at a faster rate than normal. Make sure everything is as expected and that the connector tabs seal the connection properly. Feel free to use an electrical contact cleaner to ensure everything connects and disconnects smoothly, not to mention the increased electrical connectivity in the connections with the use of this product.

Basic Step #3

Check the circuit integrity by following the troubleshooting steps provided by your specific vehicle’s service manual. An example is to disconnect the supply voltage circuit from the ECM and the fuel injector, then using your multimeter, determine whether the wires are in good working condition or not.

A test I like to do to quickly determine if there is an open in a particular wire that would help with the P2152 code is to perform a “continuity test.” Set your multimeter to RESISTANCE (aka ohm, impedance, etc.), touch one end to one end of the circuit and the other end to the other end. Any value higher than desired may indicate a problem in the circuit. Any issue here will need to be determined by tracing the particular wire you are diagnosing.

How Severe is This DTC?

I would say rather severe. In the field, we refer to a lack of fuel in the burned mixture as a “lean” condition. When your engine is idling, you risk causing extreme damage to the engine in the short and long term. With this in mind, always follow your engine maintenance. There must be some diligence here, so let’s keep our engines running smoothly and efficiently. After all, they carry our weight to transport us daily.

What Are Some of the Symptoms of the Code?

Symptoms of a P2153 fault code may include:

• Irregular engine performance
• Misfire
• Reduced fuel economy
• Rough idle
• Excessive smoke
• Engine noise(s)
• Lack of power
• Inability to climb steep hills
• Reduced throttle response

What Are Some Common Causes of the Code?

Causes of this P2153 fuel injector group supply voltage code may include:

• Faulty or damaged fuel injector(s)
• Damaged wiring harness
• Internal wiring malfunction
• Internal ECM issue
• Connector problem

What Are the P2153 Troubleshooting Steps?

Basic Step #1

The first recommended step is to locate the “group” of sensors that the manufacturer refers to. With this information, you can then find the physical location of the injector(s) and their circuits. This may involve removing many covers and/or engine components to visually access them (if possible). Be sure to inspect the harness for frayed wires. Any worn insulation should be properly repaired with a shrink tube to prevent further and/or future issues.

Basic Step #2

Sometimes, water and/or fluids can become “trapped” in the valleys where the injectors are installed. This increases the chances of the sensor connectors, among other electrical connections, corroding at a faster rate than normal. Ensure everything is as expected and that the connector tabs seal the connection properly. Feel free to use an electrical contact cleaner to allow everything to connect and disconnect smoothly, not to mention the increased electrical connectivity in the connections with the use of this product.

Basic Step #3

Check the circuit integrity by following the troubleshooting steps provided by your specific vehicle’s service manual. An example is to disconnect the supply voltage circuit from the ECM and the fuel injector, then using your multimeter, determine whether the wires are in good working condition or not.

A test I like to perform to quickly determine if there is an open in a particular wire that would help with the P2153 code is to do a “continuity test.” Set your multimeter to RESISTANCE (aka ohm, impedance, etc.), touch one end to one end of the circuit and the other end to the other end. Any value higher than desired may indicate a problem in the circuit. Any issue here will need to be determined by tracing the particular wire you are diagnosing.

How severe is this DTC?

I would say rather severe. In the field, we call a lack of fuel in the burned mixture a “lean” condition. When your engine is idling, you risk causing extreme damage to the engine in the short and long term. With this in mind, always follow your engine maintenance. There must be some diligence here, so let’s keep our engines running smoothly and efficiently. After all, they pull our weight to transport us daily.

What are some of the symptoms of the code?

Symptoms of a P2154 fault code may include:

• Irregular engine performance
• Misfire
• Reduced fuel economy
• Irregular idle
• Excessive smoke
• Engine noise(s)
• Lack of power
• Inability to climb steep hills
• Reduced throttle response

What are some common causes of the code?

Causes of this P2154 fuel injector group supply voltage code may include:

• Faulty or damaged fuel injector(s)
• Damaged wiring harness
• Internal wiring malfunction
• Internal ECM issue
• Connector problem

What are the P2154 troubleshooting steps?

Basic Step #1

The first recommended step is to locate the “group” of sensors that the manufacturer refers to. With this information, you can then find the physical location of the injector(s) and their circuits. This may involve removing many covers and/or engine components to visually access (if possible). Be sure to inspect the harness for short circuits to other power wires. Any worn insulation should be properly repaired with a shrink tube to avoid further issues and/or future ones.

Basic Step #2

Sometimes, water and/or fluids can be “trapped” in the valleys where the injectors are installed. This increases the chances of the sensor connectors, among other electrical connections, corroding at a faster rate than normal. Ensure everything is as expected and that the connector tabs seal the connection properly. Do not hesitate to use an electrical contact cleaner to make everything connect and disconnect smoothly, not to mention the increased electrical connectivity in the connections with the use of this product.

Basic Step #3

Check the circuit integrity by following the troubleshooting steps provided by your specific vehicle’s maintenance manual. An example is to disconnect the supply voltage circuit from the ECM and the fuel injector, then using your multimeter, determine whether the wires are in good working condition or not.

A test I like to do to quickly determine if there is an open in a particular wire that would help with the P2154 code is to perform a “continuity test.” Set your multimeter to RESISTANCE (aka ohm, impedance, etc.), touch one end to one end of the circuit and the other end to the other end. Any value higher than desired may indicate a problem in the circuit. Any issue here will need to be determined by tracing the particular wire you are diagnosing.

How Severe Is This DTC?

I would say rather severe. In the field, we call a lack of fuel in the burned mixture a “lean” condition. When your engine is idling, you risk causing extreme damage to the engine in the short and long term. With this in mind, always follow your engine maintenance. There must be some diligence here, so let’s keep our engines running smoothly and efficiently. After all, they pull our weight to transport us daily.

What Are Some of the Symptoms of the Code?

Symptoms of a P2155 fault code may include:

• Irregular engine performance
• Misfire
• Reduced fuel economy
• Irregular idle
• Excessive smoke
• Engine noise(s)
• Lack of power
• Unable to climb steep hills
• Reduced throttle response

What Are Some Common Causes of the Code?

Causes of this P2155 fuel injector group supply voltage code may include:

• Faulty or damaged fuel injector(s)
• Damaged wiring harness
• Internal wiring malfunction
• Internal ECM problem
• Connector issue

What Are the P2155 Troubleshooting Steps?

Basic Step #1

The first recommended step is to locate the “group” of sensors that the manufacturer refers to. With this information, you can then find the physical location of the injector(s) and their circuits. This may involve removing many covers and/or engine components to visually access (if possible). Be sure to inspect the wiring harness for broken wires. Any worn insulation should be properly repaired with a shrink tube to avoid further and/or future issues.

Basic Step #2

Sometimes water and/or fluids can be “trapped” in the valleys where the injectors are installed. This increases the chances of the sensor connectors, among other electrical connections, corroding at a faster rate than normal. Ensure everything is as expected and that the connector tabs seal the connection properly. Feel free to use an electrical contact cleaner to make everything connect and disconnect smoothly, not to mention the increased electrical connectivity in the connections with the use of this product.

Basic Step #3

Check the circuit integrity by following the troubleshooting steps provided by your specific vehicle’s maintenance manual. An example is to disconnect the supply voltage circuit from the ECM and the fuel injector, then using your multimeter, determine whether the wires are in good working condition or not.

A test I like to do to quickly determine if there is an open in a particular wire that would help with the P2155 code is to perform a “continuity test.” Set your multimeter to RESISTANCE (aka ohm, impedance, etc.), touch one end to one end of the circuit and the other end to the other end. Any value higher than desired may indicate a problem in the circuit. Any issue here will need to be determined by tracing the particular wire you are diagnosing.

How severe is this DTC?

I would say rather severe. In the field, we call a lack of fuel in the burned mixture a “lean” condition. When your engine is idling, you risk causing extreme damage to the engine in the short and long term. With this in mind, always follow your engine maintenance. There must be some diligence here, so let’s keep our engines running smoothly and efficiently. After all, they pull our weight to transport us daily.

What are some of the symptoms of the code?

Symptoms of a P2156 fault code may include:

• Irregular engine performance
• Misfire
• Reduced fuel economy
• Irregular idle
• Excessive smoke
• Engine noise(s)
• Lack of power
• Unable to climb steep hills
• Reduced throttle response

What are some common causes of the code?

Causes of this P2156 fuel injector group supply voltage code may include:

• Faulty or damaged fuel injector(s)
• Damaged wiring harness
• Internal wiring malfunction
• Internal ECM issue
• Connector problem

What are the P2156 troubleshooting steps?

Basic Step #1

The first recommended step is to locate the “group” of sensors that the manufacturer refers to. With this information, you can then find the physical location of the injector(s) and their circuits. This may involve removing many covers and/or engine components to visually access (if possible). Be sure to inspect the harness for frayed wires. Any worn insulation should be properly repaired with a shrink tube to prevent further and/or future issues.

Basic Step #2

Sometimes water and/or fluids can be “trapped” in the valleys where the injectors are installed. This increases the chances of the sensor connectors, among other electrical connections, corroding at a faster rate than normal. Ensure everything is as expected and that the connector tabs seal the connection properly. Feel free to use an electrical contact cleaner to make everything connect and disconnect smoothly, not to mention the increased electrical connectivity in the connections with the use of this product.

Basic Step #3

Check the circuit integrity by following the troubleshooting steps provided by your specific vehicle’s maintenance manual. One example is to disconnect the supply voltage circuit from the ECM and the fuel injector, then using your multimeter, determine if the wires are in good working condition or not.

A test I like to do to quickly determine if there is an open in a particular wire that would help with the P2156 code is to perform a “continuity test.” Set your multimeter to RESISTANCE (aka ohm, impedance, etc.), touch one end to one end of the circuit and the other end to the other end. Any value higher than desired may indicate a problem in the circuit. Any issue here will need to be determined by tracing the particular wire you are diagnosing.

How severe is this DTC?

I would say rather severe. In the field, we call a lack of fuel in the burned mixture a “lean” condition. When your engine is idling, you risk causing extreme damage to the engine in the short and long term. With this in mind, always follow your engine maintenance. There must be some diligence here, so let’s keep our engines running smoothly and efficiently. After all, they pull our weight to transport us daily.

What are some of the symptoms of the code?

Symptoms of a P2157 fault code may include:

• Irregular engine performance
• Misfire
• Reduced fuel economy
• Irregular idle
• Excessive smoke
• Engine noise(s)
• Lack of power
• Unable to climb steep hills
• Reduced throttle response

What are some common causes of the code?

Causes of this P2157 fuel injector group supply voltage code may include:

• Faulty or damaged fuel injector(s)
• Damaged wiring harness
• Internal wiring malfunction
• Internal ECM issue
• Connector problem

What are the P2157 troubleshooting steps?

Basic Step #1

The first recommended step is to locate the “group” of sensors that the manufacturer refers to. With this information, you can then find the physical location of the injector(s) and their circuits. This may involve removing many covers and/or engine components to visually access (if possible). Be sure to inspect the harness for short circuits to other power wires. Any worn insulation should be properly repaired with a shrink tube to avoid further issues and/or future ones.

Basic Step #2

Sometimes, water and/or fluids can be “trapped” in the valleys where the injectors are installed. This increases the chances of the sensor connectors, among other electrical connections, corroding at a faster rate than normal. Ensure everything is as expected and that the connector tabs seal the connection properly. Feel free to use an electrical contact cleaner to make everything connect and disconnect smoothly, not to mention the increased electrical connectivity in the connections with the use of this product.

Basic Step #3

Check the circuit integrity by following the troubleshooting steps provided by your specific vehicle’s maintenance manual. An example is to disconnect the supply voltage circuit from the ECM and the fuel injector, then using your multimeter, determine if the wires are in good working condition or not.

A test I like to do to quickly determine if there is an open in a particular wire that would help with the P2157 code is to perform a “continuity test.” Set your multimeter to RESISTANCE (aka ohm, impedance, etc.), touch one end to one end of the circuit and the other end to the other end. Any value higher than desired may indicate a problem in the circuit. Any issue here will need to be determined by tracing the particular wire you are diagnosing.

Symptoms

Symptoms of a DTC P2158 may include:

• Loss of anti-lock braking
• The “anti-lock” or “braking” warning lights on the dashboard may be illuminated
• The speedometer or odometer may not function correctly (or at all)
• Your vehicle’s RPM limiter may be reduced
• Shifting of an automatic transmission may become irregular
• Other symptoms may also be present

Causes

A P2158 code may indicate that one or more of the following events have occurred:

• The vehicle speed sensor (VSS) “B” is not reading (functioning) correctly
• A broken/frayed wire leading to the vehicle speed sensor
• The vehicle’s PCM is not properly configured for the actual tire size of the vehicle

Possible Solutions

A good first step for vehicle owners or DIYers is to search for technical service bulletins (TSBs) for your specific make/model/engine/year of vehicle. If there is a known TSB (as is the case for some Toyota vehicles), following the instructions in a bulletin can help save time and money in diagnosing and repairing your issue.

Next, visually inspect all wiring and connectors leading to the speed sensor. Carefully look for rubbing, exposed wires, broken wires, melted areas, or other damage. Repair as needed. The sensor’s location depends on your vehicle. The sensor may be located on the rear axle, transmission, or possibly the wheel hub assembly (brake).

If the wiring and connectors are in good condition, check the voltage at the speed sensor. Again, the exact procedure will depend on your vehicle’s make and model.

If everything appears correct, replace the sensor.

Symptoms

Potential

This code differs from the P2158 code in that it may not trigger the Malfunction Indicator Light (MIL). The potential symptoms are basically the same as the VSS P0500 code:

• Loss of anti-lock braking
• The “anti-lock” or “braking” warning lights on the dashboard may be illuminated
• The speedometer or odometer may not work correctly (or at all)
• Your vehicle’s RPM limiter may be reduced
• Shifting of an automatic transmission may become irregular
• Other symptoms may also be present

Causes

A P2159 DTC fault code can be caused by one or more of the following:

• The vehicle speed sensor (VSS) “B” is not reading (functioning) correctly
• A broken/frayed wire leading to the vehicle speed sensor
• The vehicle’s PCM is not properly configured for the vehicle’s actual tire size

Diagnostic and Repair Steps

A good first step for a vehicle owner or DIYer is to search for Technical Service Bulletins (TSBs) for your specific vehicle make/model/engine/year. If there is a known TSB (as is the case for some Toyota vehicles), following the instructions from a bulletin can help save time and money in diagnosing and repairing your issue.

Next, visually inspect all wiring and connectors leading to the speed sensor. Carefully look for chafing, exposed wires, broken wires, melted areas, or other damage. Repair as needed. The sensor’s location depends on your vehicle. The sensor could be on the rear axle, transmission, or possibly the wheel hub assembly (brake).

If the wiring and connectors are in good condition, check the voltage at the speed sensor. Again, the exact procedure will depend on your vehicle’s make and model.

If everything appears correct, replace the sensor.

How severe is this DTC?

Conditions that contribute to the storage of a P215A code can lead to ABS deactivation or erratic transmission shift patterns. The code should be considered severe and addressed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P215A diagnostic code may include:

Erratic speedometer
Inadvertent activation of ABS or traction control system (TCS)
Irregular transmission shift patterns
ABS codes may be stored
ABS may be disabled

What are some common causes of the code?

Causes

of this P215A code may include:

Excessive metal debris on the output speed sensor/wheel magnet
Faulty wheel speed sensor/vehicle speed sensor
Cut or damaged wiring or connectors
Broken, damaged, or worn reluctor ring teeth
Faulty PCM, ABCM, or EBCM

What are the diagnostic and troubleshooting steps for P215A?

A diagnostic scanner with a built-in oscilloscope, a digital volt/ohmmeter (DVOM), and a reliable vehicle information source will be needed to diagnose a P215A code.

You will need the vehicle information resource for wiring diagrams, connector face views, connector pinout diagrams, diagnostic flowcharts, and component testing procedures/specifications. Without this information, successful diagnosis is impossible.

After performing a visual inspection of the wiring and connectors related to the system, I would proceed by connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and freeze frame data. I like to note this information as it may be useful as the diagnostic process unfolds. After that, I clear the codes and test the vehicle to see if the code resets.

If you have access to an oscilloscope type:
The following procedure applies to the output speed sensor and all individual wheel speed sensors.

• Connect the oscilloscope’s positive test lead to the signal circuit of the sensor being tested
• Select the appropriate voltage setting on the oscilloscope (sensor reference is usually 5 volts)
• Connect the negative test lead to a ground (sensor ground or battery ground)
• With the drive wheels off the ground and the vehicle secured, run the drivetrain while observing the waveform on the oscilloscope screen
• You are looking for a uniform waveform pattern without voltage spikes or glitches when smoothly accelerating/decelerating through all gears
• If inconsistencies are found, suspect a faulty sensor or poor electrical connection

Test the output speed sensor and individual wheel speed sensors:

• Set the DVOM to the ohms setting and unplug the sensor being tested
• Use the test leads to probe the connector pins and compare your results with the sensor test specifications
• Sensors not meeting specifications should be considered faulty

Test output speed and individual wheel speed sensor reference voltage:

• With key on/engine off (KOEO) and the tested sensor disconnected, probe the sensor connector’s reference circuit pin with the DVOM’s positive test lead
• Simultaneously, the DVOM’s negative test lead should be used to probe the ground pin of the same connector
• The reference voltage should meet the specifications provided in your vehicle information resource (usually 5 volts)

Test output speed sensor and individual wheel speed sensor signal voltage:

• Reconnect the sensor and probe the signal circuit of the sensor being tested with the DVOM’s positive test lead (negative test lead to sensor ground or known good engine ground)
• With key on engine running (KOER) and drive wheels safely on the ground, run the transmission while observing the voltage display on the DVOM
• A speed-voltage chart can be found in the vehicle information source. You can use it to determine if the sensor is functioning correctly at different speeds
• If any of the tested sensors do not reflect the appropriate voltage level (depending on speed), suspect it is faulty.
• If the signal circuit reflects the correct voltage level at the sensor connector, use the DVOM to test the output speed sensor and individual wheel speed sensor signal circuits at their

respective controller connectors:

• Use the DVOM’s positive test lead to probe the appropriate signal circuit at the controller
• The negative test lead should again be grounded
• If there is an acceptable sensor signal at the sensor connector that is not present at the controller connector, you have an open circuit between the controller and the tested sensor.
• Suspect controller failure or programming error only after exhausting all other possibilities.

Use the vehicle information source to gather technical service bulletins (TSBs) that match the vehicle, symptoms, and stored codes in question. A code that applies to your situation can help develop an accurate diagnosis