OBD-II code · Powertrain (generic, extended)
P2803 Transmission Range Sensor B Circuit High
Voltage on the range sensor B signal line is above the expected window. Wire shorted to B+ or sensor open.
Is it safe to drive with P2803?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to B+
- PossibleOpen range sensor B
- 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
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Transmission Range Sensor B, Wiring Harness, Tcm
Related codes
- P0708Transmission Range Sensor A Circuit High
- P2800Transmission Range Sensor B Circuit (PRNDL Input)
- P2801Transmission Range Sensor B Circuit Range/Performance
- P2802Transmission Range Sensor B Circuit Low
- P2804Transmission Range Sensor B Circuit Intermittent
- P2805Transmission Range Sensor A/B Correlation
- P2806Transmission Range Sensor Alignment
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.