Error Code P208B: What It Means & What To Do?

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The trouble code P208B can be elucidated as Reductant Pump Control Range/Performance. This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially those made from 1996 up to present. It’s also more common among Audi, Citroen, Chevrolet, Ford, Hyundai, Nissan, Peugeot, and Volkswagen vehicles. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model, powertrain configuration type, to another. This trouble code indicates that there is an issue with the reductant pump control circuit.

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. When the reductant pump doesn’t perform in accordance to the system requirements, the OBD code P208B gets stored in the PCM.

What causes this problem with the Reductant Pump Control Range/Performance?

• There can be inoperative reductant pump
• There can be opened or shorted reductant pump circuit harness
• Quirks in the SCR controller/PCM or programming error

1. Engine Control Module - Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Automatic Transmission Module - Sometime the transmission module is unable to communicate or correctly anticipate the speed of the vehicle and thus creates difficulty in gear shift leading to sluggish acceleration, throttle response and stalling. Thus can also hamper a lot of components physically and thus must be check for and replaced, if required.
3. Fuel Injector - The fuel injectors are important component of the fuel delivery system that helps in proper utilization of the fuel entering the engine. This not only helps in taking care of the air to fuel ratios in the engine, helping the combustion process but also enhances the performance. Thus, replace faulty injector now!
4. Powertrain Control Module - If the PCM is faulty, it can stores wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus replace it immediately.
5. Exhaust Gas Recirculation Valve - It is auto part commonly found on many road going automobiles. It is a part of the vehicle’s exhaust gas recirculation (EGR) system, an emissions system that is designed to recirculate exhaust gases back into the vehicle’s intake so that it can reduce cylinder temperatures and NOx emissions. Purchase top notch exhaust gas recirculation valve from us at economical prices.
6. Electronic Control Unit - If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
7. Diagnostic Tool - Choose from our diagnostic tools collection that will come handy to detect and correct the OBD error code.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P208B here:

Common Symptoms

• The service engine soon light can start lighting up
• Decrease in the overall fuel efficiency
• There might be a lot of black smoke coming out from vehicle exhaust
• The engine performance might start declining
• Existence of some other SCR related codes

Want to correct the Trouble Code P208B? Read these points mentioned below:

• Make sure to mend faulty electrical connection
• It is essential to restore the flawed reductant pump control
• Rehabilitate the defaults in the wiring harness
• Carefully adjust the leakage in the exhaust

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P208B code to be stored:

• The mechanic or the technician will use a diagnostic scanner or code reader like DVOM to visually scan for the error codes in the vehicle.
• After performing a careful inspection, every of the stored codes and freeze frame data are retrieved as it can help down the way for further diagnosis process.
• Then the mechanic should visually inspect the faulty as well as damaged parts.
• After that the scan tool should be utilized to inspect the EGT sensor readings and the exhaust gas pressure readings. Now once the exhaust gas temperature has been fully inspected, there would be a need of a multimeter to inspect for proper voltage at the pressure sensor.
• Check for the performance of the reductant pump in accordance with the exhaust system functions and replace it, if required.
• Then the final step would be to examine the exhaust system for any leakage.

Common Mistakes When Diagnosing The P208B Code

A common mistake which is made by many technicians is to overlook a leakage in the exhaust as a cause of P208B, and giving more importance to other extensive issues. If you want to easily fix this fault code, then it is essential to perform a step-by-step diagnosis.