C0308Transfer Case Motor A/B Circuit Low
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- None of the publicly available J2012 lists contains C0308, and no source links it to a ride height sensor. GM uses it for the transfer case shift motor: PIP5094 lists the number, AA1Car's GM chart labels it Motor A/B Circuit Low, and Dorman's guide for its replacement motor covers 1998–2005 S10 Blazer, Sonoma, Tahoe, Suburban, Yukon, Silverado, Sierra, Escalade, Avalanche and related trucks. The transfer case module sets it when it finds motor control line A or B shorted to ground, or when the feedback voltage on those lines is far too low. Once stored, the module stops every 4WD shift and lights Service 4WD. The sibling codes C0309 and C0310 cover a high voltage and an open circuit on the same lines.
- What you may notice
- Service 4WD lamp on
- No shifting into or out of four-wheel drive
- Likely causes
- LikelyMotor control wire A or B chafed against the frame and grounded
- PossibleShift motor internally shorted
- RareTransfer case control module output stage faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.