What it means
The module monitors current in circuit A associated with the A/C compressor motor. It sets this code when the reported current exceeds the expected range.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Circuit A carries current for the electric A/C compressor motor, and the control system monitors that current to detect abnormal load. This code sets when current is above the expected range, which can indicate a mechanically overloaded compressor or a short between motor phases.
Common causes
Most likely first.
- Compressor mechanical overload
- Phase short
How to diagnose it
- Record freeze-frame data and review compressor current live data to determine whether the excess occurs at startup or during sustained operation.
- Inspect the compressor and its wiring for visible damage, overheated connectors, or signs of binding, following the manufacturer’s high-voltage safety procedure.
- Check the compressor motor phases and related wiring for shorts using the manufacturer’s specified isolation and test procedure.
- Assess whether the compressor is mechanically overloaded using the service information and the vehicle’s available diagnostic data.
- If the motor and wiring test normally, check the current measurement path and compressor control module for an inaccurate reading.
Common fixes
- Repair damaged or overheated compressor wiring and terminals.
- Correct a phase-to-phase short if confirmed by testing.
- Replace the compressor if it is mechanically seized or overloaded and fails the specified checks.
- Repair the current sensing or control component if it is found to report excessive current incorrectly.
Can I keep driving?
Stop using the A/C if the compressor is noisy, hot, or repeatedly shuts down; excess motor current can overheat wiring or damage the compressor drive. Follow the vehicle’s high-voltage safety guidance and arrange prompt diagnosis before operating the system again.
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.