Error Code P20B0: What It Means & What To Do?

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Are you looking for the symptoms, diagnostic procedure and common causes for the P20B0 error code? If your answer is yes, then you are at the right place. This is a general type of error code and is commonly known as reductant metering unit temperature sensor circuit intermittent/ erratic. The error code will get stored in the vehicle if there is an irregular signal in the system.

The failure of the powertrain control module is well-known as the reductant metering unit temperature sensor circuit. The reductant diesel exhaust fluid which is the heating unit will make sure that the diesel exhaust fluid does not freeze or form as crystals either between the tank and the injector. The temperature of the system is monitored by the engine computer with the help of reductant metering unit temperature sensor. The P20B0 error will get stored if an erratic signal is sent back by the temperature sensor.

What causes this problem with the Reductant Metering Unit Temperature Sensor Circuit Intermittent/Erratic?

• Defective reductant metering unit temperature sensor.
• Reductant metering unit temperature sensor harness might have an opening or short circuit.
• Reductant metering unit temperature sensor circuit might have a weak electrical connection.
• Failure of the powertrain control module.

Interested in knowing the symptoms to OBD code P20B0? If yes, then you have arrived at the right place. We at Parts Avatar have listed out few common symptoms associated with Reductant Metering Unit Temperature Sensor Circuit Intermittent/Erratic.

Common Symptoms

• DPF regeneration will not take place.
• Either the warning light of the service engine or the engine light will remain on.

Have a look at some ways with which you can correct the P20B0 code:

• Fixing the damaged reductant metering unit temperature sensor.
• Changing the harness of the reductant metering unit temperature sensor
• The weak electrical connection of the reductant metering unit temperature sensor has to be fixed.
• Replacing the damaged powertrain control module.

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• One of the main reason for the P20B0 error code is because of the engine light which has failed.
• Firstly, the mechanic will check the gas cap for the faulty engine light.
• He will visually inspect the gas cap for any possible damages or cracks. If there are no damages, he will pull over and retighten the gas cap.
• After making sure that there are no damages in the gas cap, the mechanic will test drive the vehicle and see if the engine light still appears.
• Another reason, as to why this error code appears is because of the faulty reductant metering unit temperature sensor.
• The mechanic will look after these components very carefully and replace them if they are damaged.
• After this, the mechanic will check the harness as well as the electrical connection of the reductant metering unit temperature sensor for any possible damages and fix if any issue arises.
• As a very rare case, the mechanic will carefully check for any faults in the engine control module and replace them if they are found to be damaged.
• After carrying out this diagnosis, the mechanic will reset the vehicle for any error codes and test drive the vehicle again to see if the error code still appears and the engine light turns on.

Common Mistakes When Diagnosing the P20B0 Code

• Broken powertrain control module.
• The electrical wires might cause some trouble in the vehicle.
• Malfunctioning of the reductant heating unit temperature sensor.