Fault code P062B – internal control module fuel injector control performance

Fault code P062B is called “Internal Control Module Fuel Injector Control Performance” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P062B

Stored code P062B means that the Powertrain Control Module (PCM) has detected an internal fuel injector control performance error. Other controllers may also detect a PCM processor performance error and cause this code to be stored.

Fault code P062B – internal control module fuel injector control performance

The module’s internal monitoring is responsible for performing various controller self-test functions and overall accountability. The fuel injection control system inputs and outputs are self-tested and constantly monitored by the PCM.

Each fuel injector is used to deliver the exact amount of fuel to a particular cylinder. This occurs when maximum performance and efficiency is to be achieved.

You can think of each fuel injector as a valve that is opened or closed by battery voltage. When the ignition is on, a constant battery voltage is applied.

To complete the circuit and force each fuel injector to spray the exact amount of fuel at the correct time, the PCM delivers a momentary ground pulse.

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

When the ignition is turned on and power is applied to the PCM, a self-test of the fuel injection control system is initiated. In addition to performing the self-test, the Controller Area Network (CAN) also compares signals from each individual module. To ensure that each controller is operating properly, these tests are performed simultaneously.

If the PCM detects discrepancies in the internal fuel injector control system, code P062B will be stored. In addition, if the PCM detects a mismatch between any of the on-board controllers. Which indicates an internal fuel injector controller error, this code will also be stored.

It may take several failure cycles for the MIL check lamp to turn on, depending on the perceived severity of the fault.

Symptoms of vehicle malfunctions

The main signal that an error P062B has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. The “Check engine” control lamp on the control panel will light up (the code will be memorized as a fault).
  2. Other related trouble codes may also be present.
  3. The engine does not accelerate well at idle or under load.
  4. The engine does not accelerate well.
  5. Ignition skips in the engine.
  6. Excessively poor or rich exhaust.
  7. Excessive fuel consumption.

Failure of the module processor in the internal control should be categorized as a serious code. Stored error P062B can suddenly and without warning lead to serious driving problems.

Factors that can cause this error code

The error code P062B can mean that one or more of the following problems have occurred:

  • Fuel injectors are defective.
  • Open or short circuit in wiring circuit.
  • Corroded electrical sensor connector.
  • CAN bus may be faulty and shorted to ground or wire breakage.
  • Insufficient grounding of the control module.
  • Sometimes the cause is the PCM itself.

How to fix or reset OBD-2 code P062B

Some suggested steps for troubleshooting and fix the error code P062B:

  1. Read all stored data and error codes with an OBD-II scan tool. To find out when and under what circumstances error P062B appeared.
  2. Clear the error codes from the computer memory and test-drive the vehicle to find out if the malfunction appears again.
  3. Check the fuel injectors.
  4. If the error code appears again, visually inspect the control module (PCM) electrical leads and connector.
  5. Measure battery voltage and compare with manufacturer’s specification.
  6. Check the continuity of the PCM power and ground circuits with a multimeter.
  7. Evaluate the Control Module (PCM) operation following the vehicle manufacturer’s procedure.
  8. Clear the error code from the computer memory again, and test drive the vehicle to determine if the problem has been resolved.

Diagnose and repair of problems

If ECM/PCM power supply codes are present, they must be cleared before attempting to diagnose error P062B. Also, if fuel injector or control circuit fault codes are present, they must be cleared first.

Next, you must connect the scan tool to the vehicle’s diagnostic port and retrieve all stored codes and data. Make a note of this information in case the code turns out to be intermittent.

After recording all the necessary information, clear the codes and test drive the vehicle until the code is cleared or the PCM goes into standby mode. If the PCM goes into standby mode, the code is intermittent and will be more difficult to diagnose.

Check the controller and electrical parts

Use a multimeter to check the fuses and power relays on the controller. Check and replace blown fuses if necessary. Fuses should be checked with the circuit loaded.

If all fuses and relays are working as they should, a visual inspection of the controller wiring and harnesses should be performed. Chassis and motor grounding should also be checked.

Visually inspect the system controllers for signs of water, temperature, or collision damage. Any controller that is damaged, especially by water, should be considered faulty.

If the power and ground circuits of the controller are intact, it is likely that the controller itself is defective or that a programming error exists. Reprogramming the control module will be necessary to replace it.

Unlike most other codes, error P062B is most likely caused by a faulty controller or its programming error.

Some aftermarket PCM manufacturers offer preprogrammed controllers for certain models. Contact your auto parts supplier with the vehicle serial number, mileage, and other pertinent information.

On which vehicles does this problem occur most frequently

Fault code P062B can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Audi
  • Buick (LaCrosse)
  • Cadillac
  • Chevrolet (Camaro, Equinox, Impala)
  • Citroen (Jumper)
  • Dodge (RAM)
  • Ford (Kuga, Transit)
  • GMC
  • Infiniti (QX56)
  • Land Rover
  • Mazda
  • Mercedes-Benz
  • Nissan (Juke, Patrol, Qashqai, Serena)
  • Opel (Insignia)
  • Peugeot (408, Boxer)

Fault code P062B can sometimes be found with other errors. The most common are the following: P0011, P0014, P061A, P061B, P061C, P061D, P061E, P061F, P062C.


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