Powertrain, generic · Hybrid propulsion

P0C51 Drive Motor A Position Sensor Circuit A Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C51 means the first resolver winding of motor A (Circuit A) delivers a signal that is electrically present but not believable, for example unsteady or out of step with the second winding. Bentley uses it on 2025 Continental GT, GTC and Flying Spur hybrids, logged by the e-drive control unit at address 0051 next to P0A4000 and later P0C5B00, with a drive system message in the cluster. Bulletin 2080242 asks for logged measured values, a check of the sensor and power electronics plugs for bent pins, weak terminal grip, moisture or corrosion, then basic settings; revision 3 adds a new 90-degree connector. No set threshold is published. P0C52 to P0C54 cover low, high and sporadic faults of the same line.

Likely causes

Weak terminal grip or bent pins at the sensor or power electronics connector
Moisture, oil or corrosion in the resolver connectors
Faulty 90-degree connector on the affected Bentley models (TPI 2080242/3)
Resolver winding with degraded output

Symptoms

  • Drive system fault message in the instrument cluster
  • No electric or hybrid driving mode available
  • Fault may come and go with temperature or vibration

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–1,500
Time1.5–5 h

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

Parts involved

drive motor a position sensor awiring harnesshybrid control module

Related codes

P0C50P0C52P0C53P0C54P0C5BP0A40

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.