Guide To P20EB OBD Error Code Solutions

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The trouble code P20EB can be explicated as Reductant Control Module Power Relay De-Energized Performance - Too Late Issue. If the engine control module would detect a deviation in the power voltage output in the reductant control power relay, then it would store the P20EB fault code. This would give rise to the flashing up of the check engine light.

Diesel Exhaust Fluid (DEF) helps in converting harmful exhaust particles to harmless gases. For burning these particles, the temperature of the exhaust system has to be increased. The DEF Fluid with the help of the injector is sent into the exhaust stream to raise the Diesel Particulate Filter (DPF) up to optimal temperature. The exhaust system then convert harmful nitrous oxide compounds to nitrogen, carbon dioxide, and water. The reductant pump transfers the DEF (Diesel Exhaust Fluid) from the tank to the DEF Injector and if the reductant control module power relay de-energizes too late, OBD code P20EB gets stored in the PCM.

What causes this problem with the Reductant Control Module Power Relay De-Energized Performance - Too Late?

• Problematic Reductant Control
  
• Module Power Relay
• Damaged wiring and harness to Reductant Control Module Power Relay
• Loose connections to the Reductant Control Module Power Relay circuit

1. Engine Control Module - Want to know the most common reason behind the failure in the engine control module? Corrosion or damage because of moisture can cause ECM failure. Corrosion might enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself.
2. Exhaust Gas Recirculation Valve - Did you just see check engine light flashing on your dashboard? If the computer would detect some fault with the automobile’s EGR valve circuit, then it would set up the check engine light so that the driver is notified about the fault. Don’t waste time and get them replaced or else this fault code can turn up.
3. Diesel Exhaust Fluid Pump - The diesel exhaust fluid pump needs to work properly if the transmission system has to perform. If it is not functioning, the transmission may slip and cause harsh shifts too. Thus replace faulty pump now and buy a new one from us!
4. Powertrain Control Module - The PCM makes the engine and transmission work in tandem. Any issue with the powertrain control module will cause major problems with the efficient running of the vehicle.
5. Engine Wiring Harness - Your car ECM would not operate properly if there are some cracks or break in the engine wiring harness. Corrosion as well as physical damage are the most common reasons why you should replace an engine wiring harness. Purchase high grade engine wiring harness online from Parts Avatar Canada.
6. Automatic Transmission Module – Faulty transmission module can cause problematic down shifts and upshifts, leading to stalling while accelerating or slowing down. This can also hamper many transmission system parts. Thus replace it now!
7. Electronic Control Unit - If your vehicle fails to start for no apparent reason, this is also a good indicator that there can be some issues with the ECU. If you check the car battery, starter and other common electrical components, and the vehicle still does not start, a quirky electronic control unit should be the next logical thing to consider.
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If you are facing OBD error code P20EB, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• Check engine light might come into signal
• Transmission problems
• DEF pump issues

Want to correct the Trouble Code P20EB? Read these points mentioned below:

• Repair or replace the quirky PCM/ECM
• Rehabilitate the defaults in the reductant control module power relay
• The malfunctioning electronic control unit should be repaired or replaced as per the need
• Carefully adjust the faults in the reductant control sensor
• Recondition the non-functioning reductant pump control circuit harness

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If you want to easily diagnose this P20EB fault code, then all you have to do is to follow the steps which are mentioned below:

This is a general type of error code which is diagnosed with the help of a scanner. The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data. If he happens to find any additional error codes, he has to address them as well. Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears. If the error code does not return, then there can be an erratic condition.

Step 1

First of all DVOM is used to check the reductant injection system pressure sensors as per the specifications set by the manufacturer. If there are some components which would not lie within the maximum allowable parameters set by the manufacturer, then it would mean that they are faulty.

Check for the reductant pump control system and the pump for mechanical failures and resolve them immediately.

Step 2

If the reductant injection pressure is within parameters set by the manufacturer, the code P20EB exists, and the sensor is in good working condition, use the DVOM to test input and output signal circuits between sensors and the PCM/SCR controller. All the controllers should be disconnected prior to using the DVOM for examining. Reductant injector sensor codes are often attributed to supply pumps which leak internally.

Step 3

Check for the problem in the control module and its related circuits. Also check the power relay for proper functioning by checking its power output. Repair or replace the faulty parts as required.

Common Mistakes When Diagnosing the P20EB Code

Many a times the mechanics get confused about the identity of the oxygen sensor and the exhaust gas temperature sensor. This would cause a lot of trouble and simply replacing the oxygen sensor would not lead to a successful diagnosis.

• Reductant power relay issue
• Faulty wiring and connector issue
• PCM failure

P20EA - Reductant Control Module Power Relay De-Energized Performance - Too Early