P2C3FFan 4 Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- With P2C3F the module senses the control line of fan output 4 at too low a level, which in practice means a short to ground or, with a driver that switches to ground, a line held there by a fault downstream. Saab's 2011 9-5 workshop data define the matching codes for relays 1 to 3 (P0691, P0693, P0695) as a ground short in the relay control wiring, tested with ignition between 8 and 18 V and the engine above 400 rpm, and class them as type B with warning lamp. No manufacturer publicly documents P2C3F itself. Depending on the wiring, the short can switch fan 4 on for good or blow a fuse so it never starts. Check the insulation along the harness first, then the relay coil or module input. Circuit/open is P2C3E, high voltage P2C40.
- What you may notice
- Fan 4 runs constantly or not at all
- Blown fan fuse
- Check engine light
- Likely causes
- LikelyFan 4 control wire chafed through to body or engine ground
- PossibleShorted relay coil or fan module input
- RareWater in the fan connector near the radiator
- 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 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.