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U1132: Lost Communication With Generator Control Module
Description: This code indicates that the vehicle’s control module has lost communication with the generator control module.
Generator Communication Circuit High – Typical severity: Moderate
Common Causes
U1132 – Generator Communication
Description: This code indicates a communication error between the vehicle’s engine control module (ECM) and the generator control module.
Common Causes:
- Faulty generator control module
- Loose or corroded electrical connections between ECM and generator control module
- Defective wiring harness between ECM and generator control module
- Generator control module software issue
Common Misdiagnosis
Generator Communication Error – Common Misdiagnosis: Faulty generator or alternator is often misdiagnosed as a wiring issue or a problem with the vehicle’s ECU (Engine Control Unit).
Common Diagnostic Steps
Generator Communication Circuit
Check the generator communication circuit wiring for any signs of damage or disconnection.
Inspect connectors and terminals for corrosion, looseness, or bent pins.
Use a multimeter to test the continuity and resistance of the communication circuit wires.
Verify that the generator control module is receiving power and ground signals properly.
Perform a diagnostic scan to check for other related trouble codes that may indicate an underlying issue.
If equipped, update the vehicle’s software to ensure compatibility with the generator control module.
Consult the vehicle’s service manual for specific troubleshooting procedures related to this code.
