OBD-II code · Powertrain (generic, extended)
P2838 Shift Fork B Position Circuit Low
Voltage on shift fork B position sensor signal line is below the expected window. Wire shorted to ground or sensor short.
Is it safe to drive with P2838?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal sensor short
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–10 h
- Emissions test
- Usually unaffected
- Parts involved
- Shift Fork B, Shift Fork Position Sensor B, Wiring Harness
Related codes
- P2833Shift Fork A Position Circuit Low
- P283DShift Fork C Position Circuit Low
- P2842Shift Fork D Position Circuit Low
- P2865Shift Fork E Position Circuit Low
- P2835Shift Fork A Position Circuit Intermittent
- P2836Shift Fork B Position Circuit
- P2837Shift Fork B Position Circuit Range/Performance
- P2839Shift Fork B Position Circuit High
- P283AShift Fork B Position Circuit Intermittent
- P283BShift Fork C Position Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.