P0537A/C Evaporator Temperature Sensor Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- The evaporator temperature sensor, an NTC thermistor behind the evaporator, prevents icing: near 0–3 °C the compressor is switched off or reduced. Usually the climate module reads it and reports body codes; P0535–P0539 only arise where the engine module controls the compressor and reads the sensor. P0537 means the signal voltage is below its limit; with the usual NTC voltage divider that is a signal shorted to ground or a shorted sensor, read as implausibly warm – icing protection may then fail. No manufacturer document available to us uses this code; the description follows CARB's input component rules.
- What you may notice
- Air conditioning not cooling
- Possible icing
- Compressor permanently on or locked out
- Likely causes
- LikelySignal line shorted to ground
- LikelySensor shorted internally
- PossibleCondensate in the connector (leakage to ground)
- RareEngine module
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.