Powertrain, generic · Hybrid propulsion

P0C58 Drive Motor B Position Sensor Circuit A High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C58 sets when the S1/S3 winding circuit of the motor B resolver shows a reference level above its window, as from an open lead drifting up or a short to voltage. GM limits are 4.5 V on the 2011 and 2016 Volt, 4.9 V on the 2019 Volt and 3.0 V on the 2012 two-mode trucks, with the fast high-side timing of 20 out of 30 samples on early cars. This is one of the most frequent resolver codes on the first-generation Volt. GM's first note PIC5856 from 2013 already paired P0C58 with P0C62, the S2/S4 high code, on 2011-13 Volts: if wiring is fine, a new motor B position sensor goes in, a part ordered through GM's technical assistance center, and update the module calibration.

Likely causes

Faulty motor B position sensor on 2011-13 Volt and 2014-16 ELR (GM PIC5856)
Open S1 or S3 line or spread terminal at the resolver connector
Motor control module running an older calibration

Symptoms

  • Check engine lamp, frequently together with P0C62
  • Reduced propulsion power
  • Fault may only be in history memory

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–8 h

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

Parts involved

drive motor b position sensor awiring harnesshybrid control module

Related codes

P0C57P0C62P0C55P0C59P0A48

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