GM Code 52 CALPAK Fault
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GM 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
