P2803Transmission Range Sensor B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2803 is stored when the output of range sensor B reads too high, which typically points to an open circuit or a short to supply voltage. In GM's 2020 and 2025 tables the engine module watches its own range sensor input for this: either under 0.5 ohm to the voltage source or above 200 kilohms to ground for 0.5 s sets a Type A fault. Ford's 2024 summary flags a duty cycle over 92 % (P2800_85). In practice Ford saw P2803 together with P2804 and fluid temperature codes on 2020-2021 Transit vans, where partly seated or damaged pins in four connectors were to blame (SSM 49242 and 49510). On 2021 Bronco Sport, bulletin 21-2331 tied it to PCM calibration and fixed it by reprogramming. Low is P2802.
- What you may notice
- MIL on, often with transmission temperature codes
- Shift system warning in the instrument cluster
- Wrong or missing gear display
- Likely causes
- LikelyOpen signal circuit or pushed-out connector pin
- PossibleSignal wire shorted to a voltage source
- RareModule calibration misreading the signal, fixed by software
- RareRange sensor output stuck high
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.