Error Code P20C8: What It Means & What To Do?
OBD Code P20C8 - Reductant Heater D Control Circuit High
If your vehicle is showing some odd symptoms like
excessive black smoke or low engine performance accompanied by high fuel
consumption, there are chances that your vehicle is set to one or more of the
possible error codes related to reductant heater “D” control circuit that
indicates that something is wrong with your reductant heater system. Let's
figure it out in the sections below.
Learn More About OBD Error Code P20C8
If you are
uncertain about this problem, you must read through this entire information on
OBD P20C8 error code and also the related error codes like P20C5, P20C6 and
P20C7. We are sure they will provide you insight into your vehicle’s issue.
Your vehicle’s PCM, also known as the powertrain control module will set this error code P20C8 when it detects that the there is high voltage from the reductant heater D control circuit. To know more about this error code, take a look at few of its common causes below.
What causes this problem with the Reductant Heater D Control Circuit High
- Malfunctioning reductant heater
- Faulty reductant heater harnesses
- Poor electrical connections within the reductant heater circuit
Replace/Repair These Parts To Fix Code P20C8
- Powertrain Control Module - Also abbreviated as PCM is an integral control unit. So a defective one should be changed immediately replaced to avoid any further damage. If you need one for your car, you can easily find with us for your specific car make and model.
- Reductant Tank Heater - Living in harsh Canadian is tough and it becomes tougher if your reductant tank heater is damaged as it will result in freezing your vehicle’s diesel exhaust fluid. This might also result in flashing of OBD error code P20C8. Replace the faulty ones today.
- EGR System & Parts - Fall in engine power and acceleration reflect towards a faulty egr system. If you are experiencing these symptoms with your vehicle, then don’t think twice and replace the faulty the egr system parts today and get rid of the error code P20C8.
- Diesel Particulate System & Parts - Keep your diesel particulate system and all the related parts in best of its shape for filtering the harmful carbon particulates produced in the combustion. Get rid of this error code P20C8 by replacing the faulty DPF filters and parts.
- Catalytic Converter - Do not risk failing a emission test, make sure your car’s catalytic converters are in good shape. Replace the faulty ones today and buy brand new ones today only at PartsAvatar at the best prices ever online.
- Diesel Exhaust Fluid - Remember that dirty or low level of diesel exhaust fluid can be troublesome for your vehicle’s performance. Don’t think and replace the dirty one today.
Symptoms Of The OBD Error Code P20C8
After
knowing all the cause behind the issues, let’s have a look at few common
symptoms of this problem. Read through this section to learn more about this
error code.
Common Symptoms
- Fall in vehicle’s overall performance
- Decline in vehicle’s engine health
- Black emissions from vehicles exhaust
- Fall in fuel economy
- Occurence of other SCR error codes
How to Correct P20C8 Reductant Heater D Control Circuit High
Here are
some ways with the help of which you will be able to correct the OBD Code P20C8
- You will need to undergo faulty reductant heater replacement
- Replace all the open or shorted reductant heater wires and connectors
- Fix the electrical connections for the reductant heater C control circuit
- Change the faulty catalytic converters and other related exhaust parts
- Make sure that your vehicle’s control modules - glow plug control modules and powertrain control module are in best shape, if not, then undergo their replacement at the earliest.
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Easy Diagnosis of Engine Error OBD Code P20C8
If you want to easily diagnose this fault code P20C8, then all you have to do is to follow the steps which are mentioned below:
- You will need a diagnostic scanner, digital volt/ohmmeter and a reliable source of vehicle diagnostics to start your diagnosis of this OBD error code P20C8. It will be really helpful if you could get hold of technical service bulletin (TSB) specific to your vehicle. Believe us it will prove to be extremely helpful for you in your diagnosis process. While choosing a TSB, make sure that it matches your vehicle year, make, and model and also the engine size.
- Now, to begin you diagnosis, undergo a complete visual inspection of your vehicle’s reductant heater D control Circuit and related harnesses and connectors. Make sure the wires and connectors are not burnt or damaged, in case they are you will need repair or replace them
- Now, connect the diagnostic scanner to the diagnostic port of your vehicle and restore all the store codes and freeze the frame data. Not the information and clear all the codes. Next step is to test drive the vehicle till the vehicles PCM enters the readiness mode or the code is reset. In case of an intermittent code, it will be more difficult to diagnose it as the condition which set this code needs to be worsen in order to diagnose this code.
- In case the code resets itself, then you will need to look into the vehicle information source to get the diagnostic flow charts flow charts, connector pin out charts, connector face views, as well as component testing procedures and specifications. You will need this information to move on to the next diagnosis step. Make use of the DVOM to check the power supply to the SCR control system. Also, check the fuses with loaded circuit to avoid an sort of misdiagnosis.
- In case you discover inappropriate power or voltage, then you will need to test the output control circuit voltage. If this voltage turns out to be insufficient then check if the controller is bad or is facing any programming error.
- In case the voltage output circuit turns out to be within the needed parameters, then use the DVOM to check the reductant heater element for D control Circuit. You can consider as failed if the heater fails to meet manufacturer’s specifications.
Common Mistakes When Diagnosing the P20C8 Code
When you undergo error code P20C8 diagnosis, few misdiagnosis are common. In order to make sure that you don’t commit any, make sure to keep an eye on the following failures:
- Failing glow plug control module
- Failing reductant tank heater
- Troublesome wiring