What it means
The sensor A circuit signal is lower than expected. The module sets this code when it detects a low signal voltage in the auxiliary cooling system temperature sensor circuit.
How it works
Auxiliary cooling system coolant temperature sensor A sends a signal to the control module, which monitors its voltage as an indication of coolant temperature. P0E83 sets when that signal is lower than the module expects, commonly because the circuit is pulled toward ground.
Common causes
Most likely first.
- Short to ground in sensor wiring
- Failed temperature sensor
- Corroded or wet connector
- Poor reference voltage
Symptoms
- Hybrid or EV warning light
- Temperature readings may be inaccurate
- Reduced power
- Cooling system may run inefficiently
How to diagnose it
- Check freeze-frame data and live sensor A voltage or temperature to confirm the low signal is present and note when it occurs.
- Inspect sensor A’s connector and nearby wiring for water, corrosion, pin damage, or insulation rubbed through to ground.
- With the circuit identified from vehicle wiring information, check whether the signal wire is shorted to ground.
- Check the sensor’s reference supply and ground for faults that could pull the signal low.
- If the wiring and supplies are sound, test sensor A against the manufacturer’s specification.
Common fixes
- Dry, clean, and secure sensor A’s connector if moisture or corrosion is found.
- Repair a signal wire short to ground or damaged insulation.
- Restore a faulty reference supply or sensor ground.
- Replace sensor A if it fails the specified test.
Can I keep driving?
The module may receive a false temperature from auxiliary cooling sensor A and manage cooling poorly. Limit strenuous driving or charging if a temperature warning or reduced power appears, and stop if overheating is indicated.
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.