P279C
Transfer Case Gear Neutral Incorrect Ratio
When the transfer case is in Neutral the measured output speed is not zero or shows unexpected drag.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Shift fork not fully in neutral positionCommon
- Drag torque from contaminated oilPossible
Parts involved
- Transfer Case
- Shift Fork
P279C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.