Trouble CodesGM OBD Trouble CodesGM Code 52

CODE 52 - CALPAK Fault

Trouble Code 52 indicates that the ECM sensed a fault with the CALPACK. The CALPACK is a plug-in module separate from the PROM, that contains preset calibrations used by the system during "limp home" (backup) mode. The ECM continuously checks for its presence while power is applied.

The conditions for setting this code are:

  • the ECM does not sense the CALPACK

Typical causes for this code include:

1) Incorrectly installed CALPACK module
2) Incorrect CALPACK module for this vehicle
3) Defective or incorrectly inserted PROM
4) Defective ECM

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Chevy Trouble Codes