Cadillac P1AC1: Starter/Generator Control Module Cooling Fan Relay Control Circuit Low Voltage
Is your scanner showing Cadillac P1AC1?
No worries. We'll show you what it means and how to deal with it.
Cadillac P1AC1: Starter/Generator Control Module Cooling Fan Relay Control Circuit Low Voltage
OVERVIEWWhat Does The Cadillac P1AC1 Code Mean?
The Starter/Generator Control Module (SGCM) controls the coolant fan operation by applying voltage to the coolant fan relay control circuit with an internal solid state device called a driver. When the SGCM is commanding the relay ON, the voltage of the control circuit should be low, near 0 volts.
When the SGCM is commanding the relay OFF, the voltage potential of the control circuit should be high, near 12 volts.
The SGCM monitors the relay control circuits for the following conditions:
- Short to ground
- Short to voltage
- An open circuit
If the SGCM detects an improper voltage level on the coolant fan relay control circuit, then DTC P1AC1 or P1AC2 will set and the driver will be disabled.
How Can You Fix The Cadillac P1AC1 Code?
If condition is not present, refer to Testing for Intermittent Conditions and Poor Connections.
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> GM Genuine Parts Alternator Battery Control Module
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
Cadillac P1AC1, DTCDECODE.
