Powertrain, generic (extended)

P2804 Transmission Range Sensor B Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2804 points to a B signal that drops out or jumps for short moments instead of failing permanently. Ford is the main user: its 2024 OBD summary books it as the general electrical fault of TRS B (UDS P2800_01), checked continuously, with up to 30 s allowed for pattern recognition and 2 s for analog faults. On 2020-2021 Transit vans, Ford's messages SSM 49242 and 49510 describe P2804 appearing with P2803, P0708, P0709, P0710 and P0713 and the MIL lit, and send technicians to four connectors to look for partial seating or pushed pins before any further diagnosis. The 2021 Bronco Sport bulletin 21-2331 lists it as well. Wiggle tests on the harness with the selector moved through all positions help to catch it.

Likely causes

Connector not fully seated or pin pushed back
Harness chafing that opens the circuit under vibration
Worn contacts or electronics inside the range sensor

Symptoms

  • MIL comes and goes, often with several transmission codes
  • Gear display flickers
  • Occasional shift system warning

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–600
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

P2803P0709P2800P0708

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov.