The P1532 code on your 2020 Cadillac CT5 indicates a problem with the A/C compressor clutch feedback circuit. This GM-specific code affects your CT5's 2.0L turbocharged or 3.0L twin-turbo V6 engine's air conditioning system monitoring, indicating the PCM is not receiving proper confirmation of clutch engagement status.
Understanding P1532 on CT5
The A/C compressor clutch feedback circuit provides the PCM with confirmation that the clutch has actually engaged when commanded. This feedback allows the PCM to verify A/C operation and adjust idle speed and other parameters accordingly. Code P1532 sets when there's a mismatch between the commanded state and the feedback signal.
Common Symptoms
- Check engine light on
- Air conditioning may work despite the code
- Idle speed fluctuations when A/C cycles
- Intermittent A/C operation
- No A/C engagement in some cases
- Engine may stumble when A/C engages
Primary Causes
- Open or shorted clutch feedback circuit wiring
- Faulty A/C compressor clutch coil
- Clutch not engaging due to low refrigerant
- Corroded feedback circuit connector
- A/C pressure switch preventing engagement
- PCM not detecting clutch engagement
- Damaged wiring harness
Diagnostic Procedure for 2020 CT5
First, verify the A/C system has proper refrigerant charge - low refrigerant prevents clutch engagement. Check A/C pressure switch operation. Using a scan tool, command the A/C compressor on and verify physical clutch engagement. Test for feedback signal at the PCM connector when clutch is engaged. Trace the feedback circuit for opens or shorts. Check the compressor clutch coil for proper resistance.
Repair Solutions
Recharge A/C system if refrigerant is low and repair any leaks found. Repair damaged wiring in the feedback circuit. Replace faulty pressure switches that prevent normal clutch engagement. If the clutch coil is faulty, replace the clutch assembly or compressor. Clean corroded connectors and apply dielectric grease. Clear codes and verify proper feedback signal when A/C operates.