Powertrain, generic (extended)

P2C4A Clutch Actuator Position Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The clutch actuator position sensor reports how far the release mechanism of an automated or partly automated clutch has travelled, taken at the slave cylinder or inside the actuator rather than at the pedal. Typical designs are Hall sensors reading a magnet on the clutch piston. P2C4A is the general circuit fault of this sensor. Ford reports it in two ways: its 2024 OBD summary uses P2C4A as the base code behind the low and high faults P2C4C/P2C4D (failure types 11 and 12), and lists P2C4A_48 under P166F as an internal module check of the clutch actuation position, without MIL on manual gearboxes with stop in gear. Range, low, high and erratic faults have separate codes P2C4B–P2C4E. Without a valid signal the controller cannot judge clutch state, so start-stop or automated clutch functions are switched off.

Likely causes

Damaged or corroded sensor connector near the gearbox
Open supply, signal or ground wire
Position sensor on slave cylinder or actuator failed
Control module fault (Ford internal check P166F)

Symptoms

  • Stop-start or stop-in-gear disabled
  • Warning lamp or message
  • Automated clutch may refuse to engage or drive off

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time0.5–6 h

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

Parts involved

clutch actuator position sensorwiring harnesstcmecm

Related codes

P2C4BP2C4CP2C4DP2C4EP2C4FP0805

References: fordservicecontent.com, patents.google.com, law.cornell.edu.