P062F: Internal Control Module EEPROM Error

What does P062F mean?

Learned values, adaptations, counters and configuration are saved to non-volatile memory (EEPROM or flash-emulated NVM) when the module shuts down. P062F means this memory failed a check: GM and GM Europe test at start-up whether the last write at shutdown completed, GM's 6.6 L diesel checks a checksum per data block and whether sectors can be erased, Ford's diesel reports read, write or erase errors (5 s). Lamp behaviour varies: GM petrol engine modules after two trips, the Duramax 2014 and Saab 2.0 L turbo in the first trip, GM transmission modules and GM Europe's 1.6 L turbo without it. Most often the shutdown was interrupted – battery disconnected, voltage dip, main relay dropping out too early. Learned values are lost and relearned. The code also appears in transmission and other modules.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Check engine or service lamp (depending on the maker, sometimes after two trips)
• Learned values lost: rough idle or harsh shifts until relearned
• Often no driveability symptoms

Common causes

• High Shutdown interrupted (battery disconnected, voltage dip, main relay drops out too early)
• Medium Weak battery, poor ground or supply at the module
• Medium Software fault or incomplete programming
• Low Memory defect in the module (write cycles, ageing)

Likelihood is a general estimate across vehicles; your make and model may differ.