OBD-II code · Powertrain (generic, extended)
P2AFE Engine Coolant Temperature Sensor 4 Circuit Low
Voltage on the engine coolant temperature 4 sensor signal line is below the expected window. Wire shorted to ground or sensor short.
Is it safe to drive with P2AFE?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal sensor short
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Cooling fan runs constantly or not at all
- Cabin heater weak or excessively hot
- Possible long warm-up time or hard cold start
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Engine Coolant Temperature Sensor 4, Wiring Harness, Ecm
Related codes
- P01E5Engine Coolant Temperature Sensor 3 Circuit Low
- P2184Engine Coolant Temperature Sensor 2 Circuit Low
- P2186Engine Coolant Temperature Sensor 2 Circuit Low
- P2B2DEngine Coolant Temperature Sensor 5 Circuit Low
- P2BB8Engine Coolant Temperature Sensor 6 Circuit Low
- P2AFBStarter Relay D Stuck Off
- P2AFCEngine Coolant Temperature Sensor 4 Circuit
- P2AFDEngine Coolant Temperature Sensor 4 Range/Performance
- P2AFFEngine Coolant Temperature Sensor 4 Circuit High
- P2B00Cylinder 1 Injection Pulse Performance
- P2B01Cylinder 2 Injection Pulse Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.