P2051 - OBD Trouble Code

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The trouble code P2051 can be explained as Reductant Injection Valve Circuit Low Bank 2 Unit 1. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model. The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile.

If the engine control module would detect a variation in the voltage coming from the reductant injection valve circuit that is outside the parameters set by the automobile manufacturer, then it would store the P2051 error code. This would also give rise to the illumination of the check engine light.

What causes this problem with the Reductant Injection Valve Circuit Low Bank 2 Unit 1?

• The wiring connectors that are in the injector air circuit might be defective
• The injector air sensor might be flawed
• Imperfect powertrain control module
• Installation of an exhaust system which is not meeting the specifications set by the manufacturer
• Leakage in the exhaust

1. Automatic Transmission Module – Sometimes the automatic 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
2. Engine Control Module - If there is any corrosion or breaks in the internal wiring of the harness, then it can cause a short in the ECM or can also cause corrosion in the ECM through the wiring harness. You can always rely on us as we have best auto parts for our customers.
3. Powertrain Control Module - The onboard computer, or powertrain control module is the brain of the engine control system. Now if the brain is not working properly, then neither is the car engine. Get it replaced before the situation gets worse.
4. 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!
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 - Is your car jump starting on reverse polarity? Or are you facing some intermittent starting issues? If yes, then it indicates that your electronic control unit is bad. So it is very important to replace the defective electronic control unit with us at equitable prices.
7. Diagnostic Tools - Buy quality diagnostic tools to check and diagnose OBD code P2051 error with the help of experienced mechanic. Visit us today!

There could be countless symptoms which that would accompany with this fault code. Willing to know some common symptoms of OBD Trouble Code P2051? Your wish is our demand. Have a look at them below:

Common Symptoms

• Check engine light might come into signal
• 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

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• It is essential to restore the flawed wiring that is in the exhaust temperature/pressure circuit
• Repair or replace the quirky exhaust system parts
• Rehabilitate the defaults in the exhaust temperature/pressure sensor
• Carefully adjust the faults in the powertrain control module
• Recondition the non-functioning injector air sensor

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of catalytic converter, pcm, oxygen sensor, exhaust system, air pressure sensor, reductant injector valve, dpf filter and a lot more. We are sure that now all your issues would be resolved.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2051 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 process of diagnosis should start. The mechanic should visually inspect the reductant heater system harnesses as well as connectors. Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.

After that all the stored codes as well as freeze frame data should be retrieved. This information should be written down before clearing the codes and then the vehicle should be take out for a test drive unless and until the powertrain control module would enter the readiness mode or the code is reset. Now if the PCM enters readiness mode, then it would that this code is intermittent and might be very difficult to diagnose it. If this is the real case, then you should allow the conditions which have given contribution in storing this code to worsen before the correct diagnosis can be made.

Carefully reset the code and then the source of vehicle information to get diagnostic flow charts, connector pin out charts, connector face views, as well as component testing procedures and specifications should be searched. This information would be very helpful in completing the next step of your diagnosis. The DVOM should be used to check the power supply to the SCR control system. The fuses with the circuit loaded should be inspected so that the misdiagnosis can be avoided. Now if the right power (battery voltage) and ground circuits have been located, then a scanner should be used to activate the reductant injector valve and check the output control circuit voltage. Then if the voltage is not sufficient, then it would that there are some faults in the controller or it might have faced a programming error.

If the voltage output circuit is as per the parameters set by the manufacturer, then DVOM should be used to check the reductant injection valve. If the valve is not as per the specifications set by the manufacturer, then it would mean that it has a failure. It is very important to replace it. Every time a repair work is carried out, make sure that the mechanic test drives the vehicle after every repair so that the diagnosis is successful. This can eventually help him to know as to where the error occurred.

Common Mistakes When Diagnosing The P2051 Code

A common mistake that is made by a lot of mechanics during the diagnosis of this issue is that they might replace parts without actually testing them properly. This mistake can apply to any check engine light diagnosis. There are a lot of manufacturers which offer a diagnostic procedure for all check engine light codes, that’s why it is essential to follow these procedures very carefully.