P0E82

Code

Generic P — Powertrain

Auxiliary Cooling System Coolant Temperature Sensor A Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 30 RU: 29

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Malfunction Indicator Lamp (MIL) or dedicated hybrid/EV warning light illuminated
Auxiliary cooling fan(s) running erratically or not running when expected
Battery/inverter or other auxiliary system may overheat or enter derate
Reduced charging or performance modes (system may limit operation)
Poor HVAC or coolant system behavior if tied to auxiliary circuit

Read all stored DTCs and freeze frame data with a scan tool; note conditions when the fault set
Visually inspect sensor, connector, and harness for damage, corrosion, or coolant contamination
Check coolant level and look for air pockets in the auxiliary cooling loop
Backprobe the sensor connector and verify reference voltage (usually 5 V), signal voltage, and ground with ignition on
Measure sensor resistance/voltage while changing sensor temperature (ice water / warm water) if accessible
Wiggle test harness while watching live data for intermittent changes

Sensor type: typically an NTC thermistor or 0–5 V temperature sensor used for auxiliary cooling circuits
Signal behavior: thermistor-style sensors decrease resistance as temperature rises; signal voltage commonly decreases with increasing coolant temperature when used with a pull-up
Typical raw signal range: 0–5 V (exact values vary by vehicle). Example: cold condition -> higher voltage (e.g., >3.0–3.5 V), hot condition -> lower voltage (e.g.,
Resistance behavior example (vehicle-specific): higher ohms at cold, lower ohms at hot. Refer to the vehicle service manual for exact resistance/voltage tables

Connect a scan tool, record permanent and pending codes and freeze frame data. Note operating conditions when the code set.
Visually inspect the auxiliary coolant temperature sensor and connector for contamination, corrosion, or coolant intrusion. Repair or replace damaged connectors.
Verify coolant level and purge any air from the auxiliary cooling circuit according to the service procedure. Low coolant can cause false readings.
Backprobe the sensor connector with ignition ON (engine off unless service manual specifies running): verify reference voltage (usually 5 V), good ground, and measure signal voltage. Compare to expected behavior (signal should vary with temperature).
Remove the sensor (if accessible) and measure resistance at the sensor terminals. Warm/cool the sensor in water to confirm resistance changes consistently. Compare to manufacturer spec if available.
If sensor tests good, inspect wiring harness continuity to the control module and check for shorts to power/ground. Repair any damaged wiring or connectors.
If wiring and sensor are good, inspect and test the control module input for correct operation; substitute module only after confirming upstream tests.
After repairs, clear codes, re-test under similar conditions that caused the fault, and confirm the code does not return.