P0E82: Auxiliary Cooling System Coolant Temperature Sensor A Circuit Range/Performance

What it means

The auxiliary cooling system coolant temperature sensor A signal is outside its expected range or does not track temperature plausibly. The module sets this code when the signal fails its range or performance checks.

How it works

Auxiliary cooling system coolant temperature sensor A reports coolant temperature to the control module. P0E82 sets when the signal is electrically plausible enough to read but falls outside the expected range or fails to track temperature changes as expected.

Common causes

Most likely first.

1. Faulty temperature sensor
2. Poor sensor connection or wiring resistance
3. Low coolant or abnormal coolant temperature
4. Cooling flow problem

Symptoms

• Hybrid or EV warning light
• Temperature readings may be inaccurate
• Reduced power
• Cooling system may run inefficiently

How to diagnose it

1. Review freeze-frame data and live sensor A readings to identify when the value became implausible.
2. When the system is cool, compare sensor A’s reading with actual coolant temperature and other available temperature readings.
3. Inspect the auxiliary coolant level and look for signs of poor circulation, leaks, or an abnormal temperature condition.
4. Check sensor A’s connector and wiring for corrosion, looseness, damage, or resistance that could distort the reading.
5. If coolant flow and wiring are sound, test sensor A’s response as temperature changes against the manufacturer’s specification.

Common fixes

• Correct low coolant or repair a leak, then follow the manufacturer’s filling and bleeding procedure.
• Repair poor connections or excessive resistance in sensor A’s wiring.
• Repair an identified auxiliary cooling flow problem.
• Replace sensor A if its reading does not track temperature according to specification.

Can I keep driving?

Because this code can reflect an inaccurate temperature reading or poor auxiliary coolant flow, avoid hard driving and charging if a temperature warning or reduced power occurs. Stop if the vehicle reports overheating or power falls sharply.