Error Code P201A: What It Means & What To Do?

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The trouble code P201A can be defined as Reductant Injection Valve Circuit Range/Performance 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 P201A error code. This would also give rise to the illumination of the check engine light.

The reductant injection valve circuit is being monitored by the engine control module. This trouble code would be set by the ECM when the voltage coming from the reductant injection valve circuit would not be as per the specifications set by the manufacturer. The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile.

What causes this problem with the Reductant Injection Valve Circuit Range/Performance Bank 2 Unit 1?

• Some flaws in the reductant injection valve
  
• Reductant injection valve harness might be opened or sometimes shorted
• Reductant injection valve circuit might have inadequate electrical connection
• Issue of unbolted wiring in the reductant injection valve control
• The DEF in the reservoir might not be sufficient
• There can be distorted SCR controller/PCM or programming error

1. Engine Control Module - There can be some engine performance issues due to faulty engine control module. If the ECM fails or has any problems it can lead to performance issues with the vehicle like misfires, hesitation, loss of power, and sometimes even decreased fuel economy.
2. Exhaust Gas Recirculation Valve - Did you just see check engine light flashing on your dashboard? If the computer would detect some fault with the automobile’s EGR valve circuit, then it would set up the check engine light so that the driver is notified about the fault. Don’t waste time and get them replaced or else this fault code can turn up.
3. Diesel Exhaust Fluid Pump - The diesel exhaust fluid pump needs to work properly if the transmission system has to perform. If it is not functioning, the transmission may slip and cause harsh shifts too. Thus replace faulty pump now and buy a new one from us!
4. Fuel Injector - Facing some issues in starting your vehicle? Poor idle issues? Failed emissions? These are all the symptoms of bad, faulty, leaking and clogged fuel injectors. It would be a good decision to replace your defective fuel injector with a new one online.
5. Powertrain Control Module - PCM stands for powertrain control module. It is a car part, a control unit which is utilized on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU).
6. Electronic Control Unit - If your automobile's check engine light remains on constantly, and never goes off, there's a good chance that your vehicle has a damaged electronic control unit. There are a lot of reasons why a car's check engine light will remain on. The most common reason is a defective ECU.
7. Diagnostic Tools - It is always advisable to use correct tools and equipment while resolving any OBD code issue as even small mistakes can lead to wrong diagnosis. Thus, always take help from a professional who has the knowledge and experience to such tools in efficient manner. Buy new quality diagnostic tools from us today!

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P201A code by mentioning some major symptoms below:

Common Symptoms:

• Visibility in the check engine light
• 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
• Storage of some SCR related codes

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P201A:

• Make sure to mend the faulty reductant injection valve
• Repair or replace the quirky reductant injection valve harness
• Rehabilitate the defaults in the reductant injection valve circuit
• Recondition the non-functioning wiring in the reductant injection valve control
• It is necessary to perform proper service of the unsound SCR controller
• Adjust the flawed PCM or programming error

However, if you face any issue then we have stocked a wide range of best priced PCM, reductant injection air pressure control valve, diesel exhaust fluid, exhaust system parts, diesel particulate filter, def fluid, dpf system parts, body control module component and more to help you out in fixing your car.

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

• 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.
• Most often he has to inspect the reductant injection valve circuit itself to see if they are faulty or damaged. Additional error codes that are stored in the vehicle are also addressed.
• The mechanic performs a continuity test between the PCM and solenoid to check the resistance.
• If the solenoid or the control modules are not faulty, he will then retune the code and test drive the vehicle.
• On test driving, if the P201A code does not return soon, he will know that an erratic condition exits.
• But if the error returns instantaneously, he will check every components of the control module as well as the circuit like connectors, wires, harness, fuses etc for any possible fault.
• If any component is damaged, he will fix them right away.
• After performing this repair, he will inspect the test the power supply to the SCR control system as well.
• The fuses with the circuit should also be tested to avoid the conditions of misdiagnosis.
• Now if the mechanic has located the correct power and ground circuits, then a scanner should be used to activate the reductant injector valve and then the output control circuit voltage should be tested.
• If the voltage is not sufficient enough, then it would mean that there are some defects in the controller or there might be some programming error.
• 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 P201A Code

• Non performance of the DEF injector
• Failure in the car wiring
• The PCM might not function properly

P202E - Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1