P2C3EFan 4 Control Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2C3E reports a fault on the control circuit of a fourth fan output: the driver in the engine or fan control module sees an open line, a missing load or an error it cannot sort into low or high. What counts as fan 4 is up to the maker. Saab's GM-based 9-5 of 2011 shows that such numbers follow control outputs rather than motors: three relays switch speed stages of two fans and report P0480 to P0482, or split into short to ground and short to voltage P0691 to P0696, all type B. No manufacturer publicly documents P2C3E. A blown fuse, an open relay coil, a broken wire or a loose plug at the fan are the likely finds. Depending on layout one fan stage stays off, and the engine may run hot in slow traffic. Low and high variants are P2C3F and P2C40.
- What you may notice
- One fan or fan stage does not run when commanded
- Rising temperature at idle or in traffic, weaker A/C at standstill
- Check engine light
- Likely causes
- LikelyBroken wire or loose connector in the fan 4 control line
- PossibleFan 4 relay coil open or relay missing
- PossibleBlown fuse feeding the relay or fan module
- RareOutput driver in the control module defective
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.