Powertrain, generic · Hybrid propulsion

P0C5D Drive Motor A Position Sensor Circuit B High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0C5D means the S2/S4 winding circuit of the motor A resolver, Circuit B, reads a reference level above its ceiling. This hints at an open wire whose input floats toward the supply, or contact with a voltage-carrying conductor. GM applies 4.5 V on most of its hybrids, 4.9 V on the 2019 Volt and a much lower 3.0 V on the 2012 two-mode Tahoe, Yukon, Escalade, Sierra and Silverado. On the 2013 eAssist cars, 20 failed samples out of 30 at 10.4 ms set a two-trip Type B fault; the 2011 Volt uses the same count as a one-trip Type A. When P0C5D appears with P0C53, the shared plug or the resolver itself is more likely than a single wire. No bulletin names this code.

Likely causes

Open S2 or S4 wire or backed-out terminal

S2/S4 line touching a voltage-carrying conductor

Broken S2/S4 winding in the resolver stator

Faulty resolver input stage in the motor control module

Symptoms

Check engine lamp after one or two trips depending on the vehicle
Electric assist or drive unavailable
Auto stop disabled on mild hybrids

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

P0C5C P0C53 P0C5A P0C5E P0A42

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.