P0537
A/C Evaporator Temperature Sensor Circuit Low
The evaporator temperature sensor signal voltage is below the lower diagnostic threshold. Indicates a short to ground or sensor fault.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Sensor internally shortedCommon
- Signal wire shorted to groundPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- AC Evaporator Temp Sensor
- Sensor Wiring
P0537 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.