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Possible Causes

Possible Causes 
(C27) A/C COMPRESSOR CONTROL CIRCUIT SHORTED TO GROUND
(C27) A/C COMPRESSOR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
(Z931) GROUND CIRCUIT OPEN OR HIGH RESISTANCE
A/C COMPRESSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See  DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure  . 

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