Powertrain, generic (extended)

P2803 Transmission Range Sensor B Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Open signal circuit or pushed-out connector pin
Signal wire shorted to a voltage source
Module calibration misreading the signal, fixed by software
Range sensor output stuck high

Symptoms

  • MIL on, often with transmission temperature codes
  • Shift system warning in the instrument cluster
  • Wrong or missing gear display

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–700
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission range sensor bwiring harnesstcm

Related codes

P2802P0708P2804P2800

References: gsi.ext.gm.com, fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov.