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P20B3 - OBD Trouble Code

OBD Code P20B3 - Reductant Heater Coolant Control Valve Circuit Low

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Are you looking for information with respect to the P2083 error code? Then you are at the right place. The leftover exhaust particles are converted into harmless gases with the assistance of diesel exhaust fluid that is DEF. The temperature of the exhaust system has to be increased in order to burn off the leftover exhaust particles. As you inject the DEF fluid into the exhaust system, it will raise the diesel particulate filter (DPF) up to the required temperature.

Learn More About OBD Error Code P20B3

The injurious NOx is converted into nitrogen, carbon dioxide, and then water by the system. If there are any NOx present in the exhaust stream, it will be reduced by adding the reductant catalyst. In order to prevent the freezing of the fluid, the diesel exhaust fluid will be heated by the reductant tank heater. The P2083 error code will be set in the vehicle if the engine control module identifies the malfunctioning of the reductant tank heater.

What causes this problem with the Reductant Heater Coolant Control Valve Circuit Low?

  • The reductant heater coolant control valve might be damaged.
  • You will see an opening or short circuit in the reductant heater coolant control valve harness.
  • Worse electrical connection in the reductant heater coolant control valve.

Replace/Repair These Parts To Fix Code P20B3

  1. Powertrain Control Module - The powertrain control module will monitor and compensate for any change in altitude and looks after the overall health of your car. The right replacement for your faulty powertrain control module can be found at Parts Avatar at the best prices.
  2. Reductant Injection Air Pressure Control Valve - Check if the reductant injection air pressure control valve is broken or damaged? If so replace them as soon as possible.
  3. Diesel Exhaust Fluid There will be a loss in DEF effectiveness if the diesel exhaust fluid is bad. Replace the dirty diesel exhaust fluid as soon as possible.
  4. Exhaust System - An increased engine noise is an indication that the exhaust system has to be repaired or replaced. Avoid the P20B3 error by replacing the faulty exhaust system.
  5. Diesel Particulate Filter - If your vehicle experiences too much power loss, then the diesel particulate filter can be faulty. Replace the damaged DPF quickly to avoid power loss.
  6. Reductant Heater - Carefully inspect the reductant heater for any damages or possible faults. If you find them defective, change them as soon as possible.
  7. Reductant Tank Heater Control Module - The best idea to get rid of the P20B3 error code is to quickly replace the defective or broken reductant tank heater control module.

Symptoms Of the OBD Error Code P20B3

Willing to know some common symptoms of OBD Code P20B3? Your wish is our demand. Have a look at them below:


Common Symptoms


  • You might not find the DPF regeneration in the vehicle.
  • The warning light of the service engine or the engine light might be flashing.

How To Correct P20B3 Reductant Heater Coolant Control Valve Circuit Low

We have listed out so ways which would help you to correct the occurrence of OBD Code P20B3. They are mentioned here as follows:

  • Fixing the damaged reductant heater coolant control valve.
  • The defective harness or the circuit of the reductant heater coolant control valve needs fixation.
  • The worse electrical connection in the reductant heater coolant control valve has to be changed.
  • Replacing the muddy diesel exhaust fluid.
  • Changing the damaged diesel particulate filter.

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 PCM, reductant injection air pressure control valve, diesel exhaust fluid, exhaust system, diesel particulate filter, reductant heater, reductant tank heater control module, DEF fluid and many more. Now all your problems would vanish within no time.

Easy Diagnosis Of Engine Error OBD Code P20B3

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P20B3 code to be stored:

  • Initially, the mechanic will use a scanner to check for the stored error codes.
  • He will now connect a scanner to the diagnostic port of the vehicle and recover the stored codes and freeze frame data.
  • These data are usually obtained as they can help him with further diagnostic process.
  • Firstly the mechanic will check the reductant heater coolant control valve. If there are any faults or defects, it will be repaired.
  • If there are no errors, then the mechanic will check the electrical connection as well as the harness of the reductant heater coolant control valve for any openings or shorted circuit.
  • He might also check if there are any stored error codes.
  • If there are any errors, the mechanic will repair them immediately.
  • As a final step, the mechanic will inspect the powertrain control module if it is broken or damaged. If it is broken, the mechanic will carry out the repair process.
  • After every component is repaired and when the diagnosis process is properly done, the mechanic has to test drive your vehicle again see if the engine light turns on or if the error code still appears.
  • This can help him to locate the area as to where the error was stored in the vehicle.

Common Mistakes When Diagnosing the P20B3 Code

  • Malfunctioning of the powertrain control module.
  • Failure of the reductant heater and sender assembly.
  • Reductant tank heater control module is defective.
  • The wires may be problematic.

Other Diagnostic Codes Related To OBD Code P20B3

P20B1 - Reductant Heater Coolant Control Valve Circuit/Open

P20B2 - Reductant Heater Coolant Control Valve Performance

P20B4 - Reductant Heater Coolant Control Valve Circuit High