Powertrain, generic · Hybrid propulsion

P0C5C Drive Motor A Position Sensor Circuit B Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0C5C tells that the reference level on the S2/S4 winding of the motor A resolver, Circuit B, has fallen below its floor. GM uses 0.5 V on the 2011 Volt, 2012 two-mode trucks, 2013 eAssist and the 2016 Volt and ELR, 0.10 V on the 2019 Volt; the low side needs a longer confirmation than the high side, for example 0.525 s within 0.8375 s on the 2016 Volt. On the single-motor eAssist it is a two-trip Type B code. Bentley lists P0C5C00 first in its Bentayga Hybrid note 2066714: damaged 12 V transmission wiring, often with P0C5200 and a temperature sensor code P0A2D00, so a harness worn through on one spot can pull down both windings and other motor sensors at once.

Likely causes

Transmission harness chafed or pinched, grounding an S2/S4 line (Bentley TPI 2066714)

Moisture or corrosion in the resolver connector

Shorted S2/S4 winding in the resolver stator

Symptoms

Engine warning light, often with P0C52 and a motor temperature code
Electric drive limited or switched off
On mild hybrids loss of start-stop and assist

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 a position sensor bwiring harnesshybrid control module

Related codes

P0C5D P0C52 P0C5A P0C5E P0A41 P0A2D

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.