This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.
P062F is an OBD-II Code that refers to Internal Control Module EEPROM Error
A P062F code is a general diagnostic trouble code that occurs when the ECM/PCM detects an EEPROM (Electrically Erasable Programmable Read-Only Memory) fault in the PCM (Powertrain Control Module) occurs. The term "EEPROMS" refers to “bundles” of calibration data programmed into a chip that controls various vehicle electronic systems.
The difficulty is determining which EEPROM needs to be replaced, and then resolving the problem's source before re-flashing the PCM to restore the affected EEPROM's programming and function.
Common causes for this code include:
- Controller programming is faulty
- EEPROM is defective
- Open or shorted circuit or connectors in CAN harness
- The PCM has overheated
- Insufficient control module ground
- The controller power relay if faulty
- The fuse is blown
- There is water damage
The symptoms of a P062F code are:
- Illuminated Check Engine Light
- Stalled engine or dies at idle
- No start condition
- Cooling fan does not work
- Fuel consumption has increased
To diagnose a P062F DTC code, a technician would:
- Scan for codes in the ECM and look at the freeze frame data for failure.
- Visually inspect all the wiring and connectors in the circuit.
- Check the fuses and relays in the circuit.
- Check for water damage or corrosion.
- Check the controller programming.
- Repair or replace any damaged or malfunctioning parts as necessary.
- Clear all codes and test-drive the vehicle to see if the code returns.
The following are some of the most common mistakes that a technician may make when diagnosing a P062F code:
- Not thoroughly inspecting all the wiring and connectors for damage.
- Not cleaning or repairing any damaged wiring or connectors.
- Relying too heavily on the scan tool for diagnosis.
- Replacing parts without first testing them to see if they are malfunctioning.
- Forgetting to clear all codes after repairs are completed.
How serious is this?
A P062F code is a general diagnostic trouble code that may not cause any drivability symptoms. However, if the problem is not repaired, it may eventually lead to more serious issues such as an engine stall or a no start condition.
What repairs can fix the code?
The following are solutions that may fix this problem:
- Broken or faulty wirings must be repaired or replaced
- Bad or damaged connectors must be replaced
- Water damaged or corroded parts must be cleaned or replaced
- Defective controller programming must be corrected
- Fuses and relays must be checked and replaced as necessary
- Overheated PCM must be cooled down and repaired as necessary
A P062F is related to and may be accompanied by the following codes:
P0661 – Internal Control Module Throttle Position Sensor 'A' Circuit Range/Performance
P0662 – Internal Control Module Throttle Position Sensor 'A' Circuit Low Input
P0663 – Internal Control Module Throttle Position Sensor 'A' Circuit High Input
In conclusion, the P062F code is a diagnostic trouble code that refers to a problem with the EEPROM in the PCM. This code can be caused by a variety of issues, from controller programming to water damage. If you encounter this code, be sure to have your vehicle diagnosed and repaired by a qualified technician as soon as possible.