Trouble code solution P062F: decoding, causes, resetting, meaning

Contents

Technical description and explained code P062F
Symptoms of vehicle malfunctions
Factors that can cause this error code
How to fix or reset OBD-2 code P062F
Diagnose and repair of problems
Check the controller and electrical parts
On which vehicles does this problem occur most frequently
Video

Fault code P062F is called “Internal Control Module Electronically Erasable Read Only Memory (EEPROM) Error” 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 P062F

Stored code P062F means that the transmission control module (PCM) has detected an electronic erasable permanent memory (EEPROM) error of the internal control module. Other controllers may also detect an internal PCM electronic erasable memory error and cause this code to be stored.

The internal control module control processors are responsible for various controller self-diagnostic functions and the overall accountability of the internal control module. EEPROM input and output signals are self-tested and constantly monitored by the PCM and other relevant controllers.

In automobiles, the EEPROM is used as a means to read, erase, and overwrite small amounts of programmable memory. Using special programming, the EEPROM can be erased and subsequently overwritten again.

The EEPROM is a block of transistors consisting of three parts. It is usually removable and is fixed in a specially designed slot inside the PCM. When replacing a faulty PCM, the permanent memory usually must be removed and reused in the new PCM.

The EEPROM and the new PCM must be programmed as one. Although the EEPROM can be programmed for more than 1 million changes and is designed to last for hundreds of years, it can be sensitive to overheating and moisture.

When the ignition is turned on and power is applied to the PCM, a self-test of the electronic erasable permanent memory (EEPROM) 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 a mismatch in EEPROM functionality, code P062F will be stored. Also, if the PCM detects a mismatch between any of the on-board controllers. Which indicates an internal EEPROM 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 P062F has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

Check engine control lamp on the control panel will light up (the code will be written in the memory as a malfunction).
Numerous problems with engine and transmission control.
The engine will not start.
Increased fuel consumption.
Floating revolutions, as well as attempts to stall at idle.
Sometimes, cooling fan may not work.

Trouble related to the internal module should be classified as a serious code. Stored error P062F can suddenly and without warning lead to serious driving problems.

Factors that can cause this error code

The error code P062F can mean that one or more of the following problems have occurred:

Electronic erasable permanent memory (EEPROM) is defective.
Damage by water or overheating.
Controller power relay or blown fuse is faulty.
Broken or short circuit in wiring.
Corroded electrical 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 P062F

Some suggested steps for troubleshooting and fix the error code P062F:

Read all stored data and error codes with an OBD-II scan tool. To find out when and under what circumstances error P062F appears.
Clear the error codes from the computer memory and test-drive the vehicle to find out if the malfunction appears again.
Check the electronic erasable permanent memory (EEPROM).
If the error code appears again, visually inspect the control module (PCM) electrical wiring and connector.
Measure the battery voltage and compare it to the value specified in the manufacturer’s specifications.
Check the continuity of the PCM power and ground circuits with a multimeter.
Evaluate the Control Module (PCM) operation following the vehicle manufacturer’s procedure.
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 codes are present, they must be cleared before attempting to diagnose error P062F.

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 P062F 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.