P2803 code meaning
Transmission Range Sensor B Circuit High
Powertrain system Generic code P28xx codes Check engine light
What P2803 means
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.
P2803 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2803
- MIL on, often with transmission temperature codes
- Shift system warning in the instrument cluster
- Wrong or missing gear display
Common causes of P2803
- Most likelyOpen signal circuit or pushed-out connector pin
- PossibleSignal wire shorted to a voltage source
- Less likelyModule calibration misreading the signal, fixed by software
- Less likelyRange sensor output stuck high
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Transmission range sensor bWiring harnessTCM
What each part of P2803 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 8 | Area: transmission. |
| 03 | The exact fault in that area. |
What to do next
- Note P2803 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2803
What does P2803 mean?
P2803 means "Transmission Range Sensor B Circuit High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2803?
Drive gently and only to a workshop. With P2803 the car can go into limp mode (reduced power) to protect itself.
Will P2803 fail an emissions test?
Yes, it can. P2803 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2803 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2803 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.