P0C61Drive Motor B Position Sensor Circuit B Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Engine does not crank or cranks only intermittently
- Check engine lamp with several resolver codes of motor B
- Reduced propulsion
- Likely causes
- LikelyPoor crimp at the transmission pass-through connector (GM PIP4607A, 2008 Tahoe/Yukon Hybrid)
- PossibleS2/S4 line of motor B shorted to ground
- RareShorted S2/S4 winding in the motor B resolver
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.