Powertrain, generic · Hybrid propulsion

P0C5B Drive Motor A Position Sensor Circuit B Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C5B is set when the second resolver winding of motor A (Circuit B) stays within its electrical limits yet carries a signal that does not make sense next to the first winding. Bentley added it in revision 3 of bulletin 2080242 for the Continental GT, GTC and Flying Spur hybrids: P0C5B00 now appears alongside P0C5100 and P0A4000, which shows that both windings lose plausibility at once when the shared connection is poor. The repair path is the same, measured value logs, inspection of the 8-pin and 32-pin plugs for pin drag and corrosion, replacement of a 90-degree connector after approval, then basic settings. No threshold is published. P0C5C to P0C5E are the low, high and sporadic Circuit B faults.

Likely causes

Insufficient terminal grip at the sensor or power electronics connector
Faulty 90-degree connector on affected Bentley hybrids (TPI 2080242/3)
Corrosion, oil or moisture in the resolver plugs

Symptoms

  • Drive system fault shown in the cluster
  • Electric drive mode not available
  • Usually stored together with P0C51 and P0A40

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 bwiring harnesshybrid control module

Related codes

P0C5AP0C5CP0C5DP0C5EP0C51P0A40

References: static.nhtsa.gov, law.cornell.edu, en.wikipedia.org.