Powertrain, generic · Hybrid propulsion

P0C5F Drive Motor B Position Sensor Circuit B

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C5F is the umbrella circuit code for Circuit B of the motor B resolver, which GM wires as the S2/S4 winding of the second traction motor. It fits a fault on that winding that the controller notices but cannot assign to a low or high reading. No manufacturer documents this code publicly; on GM's dual-motor hybrids the same winding is covered by P0C61 and P0C62 only. Together, P0C55 and P0C5F let a technician see whether one or both windings of motor B are affected: one alone points to that winding's wires, both together to the shared plug, the excitation or the motor control module. P0A45 reports the overall motor B angle signal. Expect a warning lamp and the loss of motor B.

Likely causes

Open wire or loose terminal in the motor B S2/S4 lines
Damaged motor B resolver or pass-through connector
Defective second pickup winding in the motor B resolver

Symptoms

  • Hybrid warning and check engine lamp
  • Motor B shut off, lower propulsion
  • Possible no-start on hybrids that crank with motor B

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,500
Time1–6 h

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

Parts involved

drive motor b position sensor bwiring harnesshybrid control module

Related codes

P0C60P0C61P0C62P0C63P0C55P0A45

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org.