P20B7 - OBD Trouble Code

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How does the P20B7 error code gets stored in the vehicle? What are its diagnostic procedure? Are there any common mistakes which are made during the diagnostic process? Are these questions popping in your mind? Then keep reading further to know more. The P20B7 error refers to the issue with the wires and is known as reductant metering unit heater control circuit performance low. The reductant diesel exhaust fluid which is the heating unit is responsible to make sure that the DEF does not stop or form as crystals between the tank and injector. Malfunction of the heating unit will store the P20B7 error code in the vehicle.

Is the fuel pump not ready when you turn on the key? Then it is best to start calculating the fuel pressure and check for the presence of a bright white- bluish spark at the terminal of every four plugs. As already mentioned above, you must also check the mechanical timing.

What causes this problem with the Reductant Metering Unit Heater Control Circuit Low?

• The reductant metering unit heater control might not work properly.
• Presence of a short circuit or an opening in the reductant metering unit heater control harness.
• Weak electrical connection in the reductant metering unit heater control circuit.

1. Reductant Metering Unit Heater - Fixing the faulty reductant metering unit heater can help to avoid the P20B7 error code from getting stored in your vehicle.
2. Diesel Exhaust Fluid System - Illumination of the CEL (check engine light) will take place if the DEF system is damaged. Get rid of the defective DEF system as soon as possible.
3. Diesel Exhaust Fluid - If the DEF is contaminated, then the diesel exhaust fluid consumption by your engine system will be more. Replace the contaminated DEF instantly.
4. Heater Module - Erratic heater behavior indicates that the heater module is malfunctioning. Get rid of the defective P20B7 error by replacing the defective heater module.
5. Heater Module Switch - Do you find the heater module switch to be broken? Get the right replacement from PartsAvatar at the best prices.
6. Powertrain Control Module - The PCM helps in generating output signals to control relays, actuators, and solenoids. If there is no proper output signal or if it is erratic then the PCM might be faulty. Fix the faulty PCM instantly.

Willing to know some common symptoms of OBD Code P20B7? Your wish is our demand. Have a look at them below:

Common Symptoms

• No occurrence of DPF generation.
• You might notice the flashing of the engine light and the warning light of the service engine.

We have listed out so ways which would help you to correct the occurrence of OBD Code P20B7. They are mentioned here as follows:

• Both the harness and the circuit of the reductant metering unit heater control which is damaged must be changed.
• Replacing the defective reductant metering unit heater control.
• Altering the bad diesel exhaust fluid.
• Fixing the broken heater module switch.

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of reductant metering unit heater, DEF system, DEF fluid, power module, module heater, heater module, heater module switch, power control module, DEF fuel, DEF diesel and many more. Now all your problems would vanish within no time.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P20B7 code to be stored:

• This is a general type of diagnostic trouble code where the mechanic will use a scanner to identify the error code that is stored in the vehicle.
• Every of the freeze frame data and stored codes will be recovered by connecting a scanner to the diagnostic port of the vehicle.
• This information can help the mechanic with further diagnosis.
• Initially, the mechanic will start inspecting the reductant metering unit heater control for any possible damages or defects.
• If there are any damages it will be fixed immediately.
• If there are no faults or stored error codes the mechanic will go about checking the harness and as well as the electrical connection of the reductant metering unit heater control if there are any openings or if the circuit is shorted.
• If there are any issues, it will be fixed immediately and the poor electrical connection will also be addressed.
• As a very rare case, the mechanic may come across the powertrain control module which might be faulty or broken. The mechanic will address this issue accordingly.
• Once the diagnosis is fully done, the mechanic will reset the code and try to test drive the vehicle to see if the engine light keeps flashing and if the error code still appears.
• This process will eventually help the mechanic to know as to where the actual fault arises.

Common Mistakes When Diagnosing the P20B7 Code

• The defective electrical wires can cause some problem.
• Damaged delivery module heater.
• Faulty power heater module power switch.