A/C Compressor Control Module Internal Temperature Sensor A Circuit Low
What it means
The A/C compressor control module internal temperature sensor A circuit is reading lower than the module expects. The module reads its own internal temperature so it can protect itself and limit compressor output when it runs hot.
Can I keep driving? Yes; this affects the A/C only, but get it read before it spreads damage to the compressor. Do not open high-voltage (orange) cables or covers yourself; leave that to a trained technician.
What this part does
Many control modules include a sensor that measures their own internal temperature. The module uses the reading to protect its electronics from overheating and, in some cases, to correct the readings of other sensors. It is built into the module rather than being a separate part on the car. A fault may reduce module performance or trigger a warning light.
Common symptoms
What you'll notice
- A/C system may not function properly or may not turn on at all
- A/C may blow only hot air or erratic temperatures
- A/C compressor may fail or continuously cycle on and off
- A/C system may display error codes or warning lights on the dashboard
- A/C system may produce strange noises or vibrations
Common causes
Most likely first
- Faulty A/C compressor control module internal temperature sensor
- Loose or damaged wiring connecting the temperature sensor to the control module
- Malfunctioning A/C compressor control module
- Issues with the vehicle's electrical system or power supply to the control module
- Sensor or module communication failure
How to diagnose & fix
Work through it in order
- Check the internal temperature sensor wiring for any loose or damaged connections.
- Inspect the A/C compressor control module for any signs of damage or malfunction.
- Clear the stored faults.
- Replace the internal temperature sensor if it is determined to be faulty.
- Replace the A/C compressor control module if all other solutions are unsuccessful.
Related codes
Read & clear P0D73 yourself
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