What it means
A control module has detected that the software in the A/C compressor control module is incompatible with its own software or configuration. Air-conditioning operation may be affected; the specific effects depend on the vehicle.
How it works
The A/C compressor control module manages compressor operation in vehicles with electronically controlled air conditioning. This code sets when another module finds the compressor module’s software or configuration incompatible with its own, which can prevent or limit air-conditioning operation.
Common causes
Most likely first.
- Incorrect or incompatible A/C compressor control module software
- Module replacement without required programming or configuration
- Incorrect module part number
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan the climate-control and other modules, recording freeze-frame data and related communication or configuration codes.
- Check whether the fault appeared after compressor-module replacement, A/C repairs, or software updates.
- Read the compressor module’s identification and software version and compare them with vehicle-specific service information.
- Inspect the module’s connectors, power and ground connections, and network wiring for damage or corrosion.
- If communication is stable, verify module configuration and software compatibility using the manufacturer’s procedure.
Common fixes
- Repair a loose or corroded compressor-module connection.
- Complete the required A/C compressor module configuration.
- Program compatible software into the compressor control module.
- Replace an incorrectly specified module with a compatible unit and program it as required.
Can I keep driving?
If the A/C is the only affected function, the vehicle is generally drivable, though cabin cooling may be unavailable. Watch for separate engine-temperature or warning symptoms, and stop if the vehicle shows signs of overheating.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.