P021B OBD Error Code: Problem & Solutions

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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 P021B trouble code can be defined as Cylinder 8 Injection Timing.

The unintended fuel injection can be detected by the powertrain control module which occurs by monitoring fuel rail pressure as well as engine speed. Now if this condition arises, then the car engine would die and won’t start.

 

The exhaust smoke would be emitted as well as no fuel rail pressure would be developed during cranking. Cranking would then activate the detected trouble code if this condition exists. If the car engine is operated for an extended period of time, then damage can occur in progressive cylinder.

 

What causes this problem with the Cylinder 8 Injection Timing?

 

• The fuel injector 8 might be faulty
• Some faults in the fuel injection solenoid
• Poor fuel injector
• There can be bad electrical connection in the fuel injector 8 circuit
• Engine timing component might be quirky
• The wiring or connectors in fuel injector control circuit might be opened or shorted
• Defaults in the crankshaft or camshaft position sensor or circuit
• Open or shorted fuel injector 8 harness
• Faults in the crankshaft or camshaft position sensor

1. Fuel Injector - A faulty Fuel Injector can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Crankshaft Sensor - If everything is alright with Fuel Injector, then there is surely some defect in Crankshaft Sensor. Get it replaced before the situation gets worse.
3. Camshaft Sensor - P021B code can display due to some issues in the Camshaft Sensor. So, it is very important to replace the Camshaft Sensor with us at equitable prices.
4. Fuel Injection Harness/Wiring - Do you remember when was the last time you got your Fuel Injection Harness/Wiring checked up? A faulty Fuel Injection Harness/Wiring can cause a lot of issues like displaying P021B code.
5. Fuel Tank - Poor Fuel Tank can cause a lot of difficulties, so why not get it replaced at time?
6. Fuel Tank Pressure Sensor - Are there some faults in your Fuel Tank Pressure Sensor? Don’t waste time and get them replaced or else P021B code can turn up.
7. Fuel Temperature Sensor - OBD Code P021B can appear because of faulty Fuel Temperature Sensor. 

There could be countless symptoms which that would accompany with this fault code. Willing to know some common symptoms of OBD Trouble Code P021B? Your wish is our demand. Have a look at them below:

 

Common Symptoms

 

• There can be an illumination in the service engine soon warning light
• Distinctive odour of diesel
• Reduction in the overall fuel efficiency
• Issue of engine misfire, sag, or stumble
• The engine performance can start decreasing
• There can be an increase in fuel consumption

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:

 

• Carefully replace the fuel injector
• If there are some defects in the crankshaft or camshaft position sensor, then it should be repaired or replaced if needed
• You must replace the open or shorted wiring or connectors in fuel injector control circuit
• The engine timing component should be working properly

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 fuel injector solenoid, injection pump, performance fuel injectors 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 P021B code to be stored:

 

You must have a diagnostic scanner, a digital volt/ohmmeter, and a reliable vehicle information source to diagnose a code P021B. Then you can start with a visual inspection of high-pressure fuel system related components and wiring harnesses. Carefully search for signs of fuel leakage as well as damage to wiring or connectors.

 

Check for technical service bulletins which pertain to the vehicle, symptoms, and codes. If such a tsb is located, it will provide very helpful information for diagnosing this code. Then connect the scanner to the vehicle diagnostic port and retrieve all stored trouble codes and freeze frame data. You can always make a note of this information as it may prove beneficial as the diagnosis unfolds. Then clear the codes and test-drive the vehicle to see if the code is reset. If there is crankshaft sensor or camshaft position sensor codes stored, then you should diagnose and repair those before attempting to diagnose the injector timing code.

 

If the code is reset:

 

If you find out that your vehicle is equipped with a common rail injection system, then you must utilize the DVOM and the vehicle information source to test the injector solenoid for the cylinder.

 

Any component which fails to comply with manufacturer’s specifications should be replaced before proceeding. After suspicious parts are repaired or replaced, clear any codes which may have been stored during testing and test drive the vehicle until the PCM enters readiness mode or the code is reset. If the PCM does enter readiness mode you know that the repair was successful.

 

If the code is reset – then you can assume that you still have a problem. If the injector solenoid is within specs, unplug the controller and use the DVOM to test system circuits for shorts or opens. Repair or replace system circuits which do not conform to manufacturer’s specifications according to the pin-out chart which is located in your vehicle information source.

 

Unit injector failure can almost always be attributed with engine timing component failure or some type of high-pressure fuel system leak.

 

• Make sure that the P021B code should be diagnosed only by a qualified technician due to extreme fuel pressure
• Determine which type of high-pressure fuel system the vehicle is equipped with before you start your diagnosis

Common Mistakes When Diagnosing The P021B Code

 

• Fuel injector failure
• Quirky wiring
• There can be some powertrain control module