DTC112
UnclassifiedEmissions
What This Code Means
Diagnostic test light (Malfunction Indicator Lamp / MIL) stays illuminated; ECM assigns default limp-home value
Possible Causes
- •Oxygen sensor lean
- •Oxygen sensor rich
- •Internal ECM fault
- •Fault condition associated with DTC112
Suggested Actions
- 1Refer to respective ECM service manual for DTC code definitions and correct each fault using ECM service manual information
- 2Always begin with the lowest numbered DTC when multiple DTC codes are displayed
- 3Correct DTC112 first before addressing DTC122
- 4Place the generator set master switch in the OFF/RESET position
- 5Remove the F1 (5 amp) fuse located between J30 connector (pink wire) and engine ECM wire 21 (pink/tan wire) for at least 15 seconds to clear DTC codes and adaptive learn feature
- 6Replace the F1 fuse
- 7Place the diagnostic test switch in the OFF (open) position
- 8Disconnect the diagnostic test light
Related General Motors Fault Codes
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