gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Powertrain Management > < Engine Controls - DTC's P1A4B or P1AB2 (42V Faults)
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P1AB2 = SGCM Current Correlation Fault

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P1AAE = SGCM Phase Correlation Fault

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B140C = SGCM APO System Fault 

Calibration Information

Warranty Information

For vehicles repaired under warranty, use the table.

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Powertrain Management > < Engine Controls - DTC's P1A4B or P1AB2 (42V Faults)