Powertrain, generic (extended)

P28CC Clutch A Motor Position Sensor Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P28CC is the plausibility counterpart to P28CB: the position signal of the clutch A motor arrives, but its values or their sequence make no sense, for example jumps between rotor angles, a missing step in the pattern, or a speed that contradicts the phase currents. CARB expects rationality checks of this kind for input components where feasible. Electrical noise from a damaged shield, a partially broken wire, a loose sensor mount or magnet, and contamination of the sensor target are typical reasons. Since commutation depends on this signal, the motor may stutter, overshoot or stall, which can also produce P28C9 or P28CA. No manufacturer publicly documents P28CC; the result for the driver is lost or rough engagement of clutch A.

Likely causes

Partly broken wire or loose contact causing signal dropouts
Electrical interference on the position signal through a damaged shield
Loose sensor, shifted magnet or contaminated sensor target

Symptoms

  • Clutch A engages roughly or intermittently
  • Transmission warning, sometimes only while driving
  • Gear changes on one shaft delayed or withheld

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,200
Time0.5–3 h

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

Parts involved

clutch motor position sensor awiring harnesstcm

Related codes

P28CBP28C9P28CAP28DB

References: law.cornell.edu, cti-symposium.world.