How is fault code P062F fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Test the battery and charging system before touching anything else. You want a healthy resting voltage and a steady output under load. A weak battery or an alternator dropping below 13.5V or so while running is the usual culprit, and replacing an ECU when the real fault is a £90 battery is a painful mistake 2. Read all stored codes and freeze frame data. P062F rarely turns up alone. Look for power supply codes and other internal module faults sitting alongside it, as they point you at the supply rather than the chip 3. Unplug the ECU connectors and inspect the pins for corrosion, green crud, water marks or bent terminals. Check the module body for any sign of moisture getting in 4. Check the ECU's supply fuses and relays with the circuit loaded, not just by eye. A fuse can look fine and still drop voltage under current 5. Look up manufacturer service bulletins for the exact vehicle. Some makes have known EEPROM quirks fixed by a specific software level, and a reflash sorts it without ne

Internal Control Module EEPROM Error

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Test the battery and charging system before touching anything else. You want a healthy resting voltage and a steady output under load.

PPowertrain
0Generic code
6Computer Output
2FSequence number

What does it mean?

OBD II fault code P062F is a generic code that is often defined by most car manufacturers as “Internal Control Module EEPROM Error”, and on applications that use this definition, the code is set when an EEPROM ( E lectrically E rasable P rogrammable R ead- O nly M emory) fault in the PCM (Powertrain Control Module occurs. However, a major complication with this code is the fact that the memory, or programming that has suffered damage, (or is lost), varies between applications.

For instance, on many Toyota products, this code refers to the programming of the fuel injectors, while on some Nissan and Chevrolet products the code refers to issues with the transmission and throttle control programming respectively. EEPROMS are essentially “bundles” of calibration data programmed into a chip that control various electronic functions on a vehicle.

The advantage of this technology lays in the fact that EEPROM’s are integral to the PCM, in the sense that they can be reprogrammed (flashed) without removing the PCM from the vehicle. However, in practical terms, the problem involves determining exactly which EEPROM is defective, and then correcting the root cause of the problem before reflashing the PCM to restore the affected EEPROM’s programming and functionality.

The image above shows the typical size and location of an EEPROM chip on the printed circuit board (PCB) of an automotive PCM. The EEPROM chip is circled in red.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.