P062B Internal Fuel Injector Control Module Control Performance

OBD-II Trouble Code - P062B - Data Sheet

Functioning of the fuel injector control in the internal control module

What does DTC P062B mean?

This is a generic powertrain diagnostic trouble code (DTC) and is commonly applied to OBD-II vehicles. This may include, but is not limited to, Ford, GMC, Chevy, Mercedes Benz, Buick, Land Rover, Mazda, Nissan, Citroen, Maserati, etc. While general, exact repair steps may vary depending on the model year, brand and models. and transmission configuration.

When the P062B code persists, it means the powertrain control module (PCM) has detected an internal performance error with the fuel injection control system. Other controllers may also detect an internal PCM performance error (in the fuel injection control system) and cause P062B to be stored.

The internal control module monitoring processors are responsible for the various controller self-testing functions and the overall accountability of the internal control module. The input and output signals of the fuel injection control system are self-tested and monitored continuously by the PCM and other relevant controllers. The transmission control module (TCM), traction control module (TCSM), and other controllers can communicate with the fuel injection control system.

Typically, the fuel injector controller is integrated into the PCM. At least one fuel injector per cylinder is used to deliver the exact amount of fuel to the cylinder when needed to achieve maximum performance and efficiency.

You can think of each fuel injector as a type of solenoid that opens or closes with battery voltage. When the ignition is on, a constant battery voltage is supplied to each fuel injector. To close the circuit and cause each fuel injector to spray the exact amount of fuel at the correct time, the PCM will provide an instant ground pulse.

The PCM uses inputs from the crankshaft position (CKP) sensor, camshaft position (CMP) sensor, oxygen sensors, mass air flow (MAF) sensor, and throttle position (TPS) sensor to monitor the operation of the fuel injector controller.

Whenever the ignition is turned on and the PCM is energized, a self-test of the fuel injection control system is run. In addition to performing a self test on the internal controller, the Controller Area Network (CAN) also compares the signals from each individual module to ensure that each controller is working as expected. These tests are performed at the same time.

If the PCM detects an inconsistency in the internal fuel injector control system, a code P062B will be stored and a malfunction indicator lamp (MIL) may illuminate. In addition, if the PCM detects a mismatch between any of the on-board controllers that indicates an internal error in the fuel injector controller, a P062B code will be stored and a malfunction indicator lamp (MIL) may illuminate. It may take several failure cycles to illuminate the MIL, depending on the perceived severity of the malfunction.

Photo of the PKM with the cover removed:

What is the severity of this DTC?

Internal control module processor codes are to be classified as Severe. A stored P062B code can suddenly and without warning cause severe handling problems.

What are some of the symptoms of a P062B code?

Symptoms of a P062B trouble code may include:

• Engine misfire
• Excessively lean or rich exhaust
• Oscillation on acceleration
• Misfire codes saved
• Engine misfire
• Extremely lean or rich exhaust
• Hesitation noted when accelerating the car
• Misfire codes are stored in the vehicle's system.

What are some of the common causes for the code?

Causes of this P062B DTC may include:

• Open or short circuit in the circuit or connectors in the CAN harness
• Insufficient grounding of the control module
• Defective fuel injectors
• Faulty controller or programming error
• Open or short circuit in the circuit between the fuel injector and the PCM
• Open or short circuit in the circuit or connectors in the CAN harness
• Insufficient grounding of the control module
• Defective fuel injector(s)
• Faulty controller or programming error
• Open or short circuits between fuel injector and PCM

Simple Engine Error Diagnosis OBD Code P062B

If you want to easily diagnose this error code P0699, all you have to do is follow the steps below. Here are a few steps you should follow to diagnose this P062B error code:

Diagnosing this code can be a challenge even for professionals. The problem with reprogramming is also present, so it is necessary to have equipment for reprogramming.

• It is important to correct any existing ECM/PCM power codes before attempting to diagnose P062B. Any individual fuel injector or fuel injector circuit codes should also be diagnosed and repaired.
• Purchase a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information. If you have a fuel injector assembly indicator, this can also be helpful when checking the fuel injector circuits. All preliminary tests can now be performed so that individual controllers (if any) can be faulted.
• Now connect the scanner to the car's diagnostic port and get all stored codes. Freeze frame data, write it down in a safe place. You may need to refer to it if the code is intermittent. Now clear the codes and take your car for a test drive, continue until the code is reset or until the PCM goes into ready mode. If the latter occurs, then the code is intermittent and therefore more difficult to diagnose. Sometimes the condition that caused the code to set may get worse so that it can be clearly diagnosed. If the code has been reset, continue with the following lists of pre-tests.
• The information is very important for diagnosing the OBD code P062B. This is where your vehicle's TSB (Technical Service Bulletin) is extremely helpful. Review your TSB and see if a matching code is found for your vehicle. If you find it, follow the diagnostic steps indicated in it.

Common Mistakes When Diagnosing Code P062B

In vehicles equipped with CAN, the stored codes are usually a response to a communication failure between modules. Because of this, misinterpretations happen and force us to replace components that are not related to CAN itself.

What are some steps to troubleshoot the P062B?

Even for the most experienced and well-equipped professional, diagnosing the P062B code can be challenging. There is also the problem of reprogramming. Without the necessary reprogramming equipment, it will be impossible to replace the faulty controller and carry out a successful repair.

If there are ECM / PCM power supply codes, they obviously need to be corrected before attempting to diagnose P062B. In addition, if there are individual fuel injector codes or fuel injector circuit codes, they must first be diagnosed and repaired.

There are some preliminary tests that can be performed before an individual controller is declared faulty. You will need a diagnostic scanner, a digital volt-ohmmeter (DVOM) and a source of reliable information about the vehicle. The no fuel injector indicator will also be useful when checking the fuel injector circuits.

Connect the scanner to the vehicle diagnostic port and get all stored codes and freeze frame data. You will want to write this information down just in case the code turns out to be intermittent. After recording all relevant information, clear the codes and test drive the vehicle until the code is cleared or the PCM enters standby mode. If the PCM enters ready mode, the code is intermittent and harder to diagnose. The condition that caused P062B to be stored may even get worse before a diagnosis can be made. If the code is reset, continue with this short list of pre-tests.

When trying to diagnose P062B, information can be your best tool. Search your vehicle information source for technical service bulletins (TSBs) that match the stored code, vehicle (year, make, model, and engine) and symptoms displayed. If you find the correct TSB, it can provide diagnostic information that will help you to a great extent.

Use your vehicle information source to obtain connector views, connector pinouts, component locators, wiring diagrams, and diagnostic block diagrams relevant to the code and vehicle in question.

Use the warning light to test individual fuel injector circuits and repair as needed. Use DVOM to test fuel injectors according to manufacturer's specifications and procedures. If all fuel injectors and fuel injector circuits are functioning as expected, perform a power supply and controller ground test.

Use the DVOM to test the fuses and relays of the controller power supply. Check and replace blown fuses if necessary. Fuses should be checked with a loaded circuit.

If all fuses and relays are working properly, a visual inspection of the wiring and harnesses associated with the controller should be performed. You will also want to check the chassis and motor ground connections. Use your vehicle information source to obtain grounding locations for associated circuits. Use DVOM to check ground integrity.

Visually inspect the system controllers for damage caused by water, heat, or collision. Any controller damaged, especially by water, is considered defective.

If the power and ground circuits of the controller are intact, suspect a faulty controller or a controller programming error. Replacing the controller will require reprogramming. In some cases, you can purchase reprogrammed controllers from the aftermarket. Other vehicles / controllers will require onboard reprogramming, which can only be done through a dealership or other qualified source.

• Unlike most other codes, P062B is likely caused by a faulty controller or a controller programming error.
• Check the system ground for continuity by connecting the negative test lead of the DVOM to ground and the positive test lead to the battery voltage.

Replace/repair these parts to fix OBD code P062B

1. Chain CAN . Chains should run smoothly and be easy to repair or replace.
2. CAN connectors - the connectors should work well, if you can fix them, then good.
3. Fuel injectors - need to be replaced as soon as the repair fails to solve their problems. Order online and enjoy free shipping on orders over $75 CAD.
4. PCM - replace your PCM

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Need more help with a P062B code?

If you still need help with DTC P062B, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.