Powertrain, generic (extended)

P2C3F Fan 4 Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Fan 4 control wire chafed through to body or engine ground
Shorted relay coil or fan module input
Water in the fan connector near the radiator

Symptoms

  • Fan 4 runs constantly or not at all
  • Blown fan fuse
  • Check engine light

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–400
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cooling fan 4fan relay 4ecm

Related codes

P2C3EP2C40P2C42P0695P0691

References: law.cornell.edu, saabwisonline.com.