OBD-II code · Powertrain (generic, extended)
P2C40 Fan 4 Control Circuit High
The control circuit of cooling fan 4 reports a control circuit high condition. Fan operation cannot be commanded reliably.
Is it safe to drive with P2C40?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyControl wire shorted to B+
- PossibleRelay coil open
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Cooling Fan 4, Fan Relay 4, Ecm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.