Powertrain, generic · Computer and auxiliary outputs

P062F Internal Control Module EEPROM Error

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

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

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

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,200
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

engine control modulecontrol module power supplymain relay

Related codes

P0603P0604P0605P0601P0602P0606

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.