P062F🔧 Engine computer (PCM) internal memoryStop and fix promptly

P062F: Internal Control Module EEPROM Error (Meaning, Causes, Fixes)

Reviewed 2026-10-23 · Based on 2 cited source(s)

What P062F means

The PCM stores its programming and some learned values in an EEPROM (electrically erasable programmable read-only memory), which can be erased and rewritten in small pieces. OBD-Codes.com says EEPROM self-tests start every time the ignition is turned on, and that the PCM and other modules on the controller area network (CAN) also cross-check each other. If the PCM detects a problem with how the EEPROM is working, or if a problem between the on-board controllers points to an internal EEPROM error, P062F is stored. Other modules, such as the transmission control module, can also detect the error. Depending on how serious the fault is, it may take several failed drive cycles before the check engine light comes on. OBD-Codes.com also notes that the EEPROM, while built to last, can be sensitive to excessive heat and moisture. RepairPal describes P062F differently: it says the PCM regularly runs a self-diagnosis in which it performs normal mathematical calculations, and sets P062F when the results are not as expected, without mentioning the memory chip specifically.

Severity: can I keep driving?

Stop and fix promptly

RepairPal puts P062F in its urgent category, meaning action is needed right away because it can cause severe damage or put the people in the car at risk. OBD-Codes.com says internal control module codes like this should be categorized as severe, because the engine computer runs the engine and often the transmission, and a fault inside it can cause stalling or a no-start. If the engine stalls, hesitates or shifts strangely, avoid busy roads and highways and get it diagnosed promptly. Don't jump-start with reversed cables or disconnect the battery with the engine running, since voltage spikes can damage control modules.

Common symptoms

Likely causes

Roughly most to least common, based on the sources below. Your vehicle may differ.

  1. Defective PCM or a programming error (both sources; OBD-Codes.com says this is the likely cause, unlike most codes)
  2. Faulty EEPROM (OBD-Codes.com)
  3. Overheated PCM or water damage (OBD-Codes.com)
  4. Bad controller power relay or blown fuse (OBD-Codes.com)
  5. Open or shorted wiring or connectors in the CAN harness, or a wiring issue (both sources)
  6. Poor control module ground (OBD-Codes.com)

Diagnostic steps you can do

⚠ Before you start

Work on a cool engine, parked on level ground with the parking brake set. Never work under a car supported only by a jack.

  1. Read all stored codes and freeze frame data with a scan tool and write them down. OBD-Codes.com says any PCM power supply codes must be fixed before diagnosing P062F.
  2. Clear the code and test drive. If it doesn't come back, the fault is intermittent and may need to get worse before it can be pinned down, per OBD-Codes.com.
  3. Look up technical service bulletins (TSBs) and recalls for your year, make, model and engine; a software update may be the known fix.
  4. Check the battery, its terminals and the PCM fuses and relays. OBD-Codes.com says fuses should be tested with the circuit loaded.
  5. Look over the PCM and its wiring for signs of water, heat or collision damage, and check the engine and chassis ground connections.

Typical fixes

Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.

🛠 When to call a pro

  • OBD-Codes.com's tools list: a scan tool, a digital volt/ohmmeter (DVOM) and a reliable vehicle information source for wiring diagrams, connector pin-outs and ground locations
  • Test ground integrity with the DVOM negative lead on ground and the positive lead on battery voltage, and test fuses and relays under load (OBD-Codes.com)
  • OBD-Codes.com says that on many PCMs the EEPROM is removable and must be moved to the replacement PCM, after which the PCM and EEPROM are programmed as a unit; some vehicles can only be reprogrammed by a dealer or other qualified shop, while some reprogrammed controllers are sold through aftermarket sources
  • The sources disagree on what is being tested: OBD-Codes.com ties P062F to the EEPROM memory self-test and CAN cross-checks, while RepairPal describes a failed internal calculation self-test and lists control module failure and wiring issues as the common problems
  • RepairPal's general advice for this code: most trouble codes come from a sensor reporting an out-of-range value, and just replacing a part may not fix the underlying issue

Where to buy

Plain search links. Always match parts to your exact year, make, model and engine.

OBD2 scanners on Amazon Parts at Advance Auto Parts catalog at RockAuto

FAQs

Can I drive with P062F?

It isn't a good idea for long. RepairPal rates it urgent and OBD-Codes.com calls it severe, because a fault inside the engine computer can cause stalling, a no-start or poor shifting.

Does P062F always mean a bad engine computer?

Not always. OBD-Codes.com says it is more likely than most codes to be a defective controller or programming error, but power, ground, fuse, relay and CAN wiring faults should be ruled out first, and a software update may fix it.

What is the EEPROM?

It's a small rewritable memory chip in the PCM that stores programming and data. OBD-Codes.com says it can be erased and rewritten in small pieces and can be sensitive to excessive heat and moisture.

Sources

  1. OBD-Codes.com: P062F Internal Control Module EEPROM Error (Stephen Darby, ASE)
  2. RepairPal: P062F OBD-II code (severity, symptoms, causes)

Last reviewed 2026-10-23. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.