Powertrain, generic · Hybrid propulsion

P0C61 Drive Motor B Position Sensor Circuit B Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C61 reports a reference level below the lower limit on the S2/S4 winding circuit of the motor B resolver. GM uses 0.5 V on the 2011 and 2016 Volt and the 2012 two-mode trucks, 0.10 V on the 2019 Volt, and needs the low reading for 50 of 80 samples on early cars, 0.25 s within 0.375 s on the 2019 model. A documented field case comes from the 2008 Tahoe and Yukon Hybrid: GM's PIP4607A describes no-crank or intermittent start complaints with P0A45, P0C61, P0A46 and P1B04, traced to a badly crimped pin 20 in the 24-way transmission pass-through connector X176; vehicles built before VIN 8R217000 receive a new internal transmission harness. P0C62 is the high side.

Likely causes

Poor crimp at the transmission pass-through connector (GM PIP4607A, 2008 Tahoe/Yukon Hybrid)
S2/S4 line of motor B shorted to ground
Shorted S2/S4 winding in the motor B resolver

Symptoms

  • Engine does not crank or cranks only intermittently
  • Check engine lamp with several resolver codes of motor B
  • Reduced propulsion

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–2,500
Time1.5–8 h

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

Parts involved

drive motor b position sensor bwiring harnesshybrid control module

Related codes

P0C62P0C57P0C5FP0C63P0A45P0A46

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