Powertrain
generic / SAE
P0539
A/C Evaporator Temperature Sensor Circuit Intermittent
Same as P0536 with intermittent or erratic signal. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 39
Possible causes
- Intermittent contact at connector high
- Connector with intermittent contact under vibration low
- Harness routed against vibrating component low
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 60–220 €
- Estimated time: 0.4–1 h
- Component: ac evaporator temperature sensor
- Component: ac temperature wiring
- MIL / check engine light
Sources
References
sae:J2012