Guide To P208D OBD Error Code Solutions

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Is the car engine not performing at par with the expectations? Do you notice affected fuel economy, increased emissions from the tailpipe and Check Engine Light illuminated on the dashboard? This can be an indication of the problem with the reductant pump control circuit of the vehicle, resulting in OBD code P208D getting stored in the Powertrain Control Module (PCM).

An engine has an exhaust gas system and a reductant delivery system. The reductant delivery system includes a pump which pumps reductant from a tank an injector which injects reductant into the exhaust gas, and a heater for heating the reductant in the tank. A control system includes an ECU which controls the pump, the injector and the heater as a function of sensed temperatures. The control system includes an idle state, a defrost state, a recirculation state and a heating state. If the PCM detects the problem in the reductant pump control circuit for the reading to be higher than the required specification, OBD code P208D gets stored in the PCM.

What causes this problem with the Reductant Pump Control Circuit High?

• Defective reductant pump control circuit
• Broken, short or corroded wiring to the pump circuits
• Poor electrical connections to the pump circuit
• SCR controller programming error
• PCM failure

1. Engine Control Module – ECM faults are rare but can be a big problem as faulty ECM will cause wrong vehicle operations and can also result in wrong OBD codes getting stored in the system which can also cause misdiagnosis. Thus, replace faulty ECM components now!
2. Powertrain Control Module – Check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
3. Diagnostic Tools – Buy quality diagnostic tools to check and diagnose OBD code P208D error with the help of experienced mechanic. Visit us today!
4. Exhaust Gas Recirculation Valve – Bad EGR valve can cause many performance issues. Common signs include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on. Thus, replace faulty EGR valve now!
5. Diesel Exhaust Fluid Pump – If the DEF pump will not function properly, it can cause increased emissions in the exhaust system and reduced the longevity of the filtration elements in the exhaust system. Thus, replace faulty pump immediately.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P208D code by mentioning some major symptoms below:

Common Symptoms

• Reduced fuel economy
• Increased exhaust emissions
• Degrading engine performance
• CEL (Check Engine Light) illuminated
• Engine performing abnormally
• Excessive exhaust smoke on load

Have a look at some ways with which you can correct the P208D code:

• Reductant pump replacement
• Diesel exhaust fluid (DEF) pump replacement
• EGR valve replacement
• SCR controller reprogramming
• PCM repair and reprogramming
• Faulty wiring and harness repair or replacement

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Here are some steps which you should follow in order to diagnose this P208D fault code:

• Check for SCR controller and DEF related code error that might also get stored in the PCM along with this code, which can solve the problem easily.
• Inspect the air injector sensor and DEF pump area for any corrosion or leakages on the exterior and if found, suspect it to be failed.
• One will require tools like a diagnostic scanner, digital volt/ohmmeter, and auto motive stethoscope.
• Connect the OBD scanner and retrieve all the coded and freeze frame the data. After doing that test run the vehicle again under same circumstances to see if the code returns to make sure which codes are persistent (in case of more than one code).
• Check for damaged, broken and corroded wiring and connector to the sensor circuit and replace them, if required.
• Use the DVOM to test for voltage from the injector pump and check for fluctuations. If the readings are not under specified range, suspect for pump failure and replace it immediately.
• If everything seems to work fine, then check for faulty PCM and replace or reprogram as required.

Common Mistakes When Diagnosing the P208D Code

It is important to understand that there can be many other factors causing this problem rather than directly blaming the injection system completely. Always check for faulty wirings, and fuses as well as air injector sensor and DEF parts for error too. Take help of professional mechanic to solve OBD code problem as this will ensure avoidance of misdiagnosis and can also help to reduce the costs associated with the repairs.

• Reductant air injector pressure sensor failure
• Reductant pump control system failure
• Powertrain Control Module (PCM) failure
• Wiring and connector issues in relation to the sensor and circuits
• Damaged or clogged DEF pump