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Possible Causes

Possible Causes 
(F891) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
(C18) A/C PRESSURE TRANSDUCER SIGNAL CIRCUIT SHORTED TO VOLTAGE
(C18) A/C PRESSURE TRANSDUCER SIGNAL CIRCUIT SHORTED TO THE (F891) 5 VOLT SUPPLY CIRCUIT
(C18) A/C PRESSURE TRANSDUCER SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(C918) A/C PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE
A/C PRESSURE TRANSDUCER
TOTALLY INTEGRATED POWER MODULE (TIPM)

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

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