P0A01Motor Electronics Coolant Temperature Sensor A Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The sensor delivers a value inside its electrical range, but it does not fit the other temperatures in the vehicle. GM uses this code on the 2013 Two-Mode hybrid Tahoe, Yukon, Escalade, Silverado and Sierra as a cold-start test: after the vehicle has stood for more than 28,800 s (8 h), the power electronics coolant temperature at power-up may differ from engine coolant temperature by no more than 30 °C, provided engine coolant and intake air agree within 15.75 °C. A failure is a Type B code with MIL after two trips. Nissan describes a similar comparison between inverter coolant and power element temperatures. Hard electrical faults are P0A02 and P0A03.
- What you may notice
- Check engine light after two trips
- Often no noticeable change in driving behaviour
- Electric drive power limited when the electronics are hot
- Likely causes
- LikelySensor characteristic drifted, reading offset against the other temperature sensors
- PossibleAdded resistance at a corroded connector shifting the reading
- PossibleLow coolant or air pocket at the sensor in the electronics loop
- RareFault actually in the engine coolant or intake air sensor used for comparison
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.