P2804 code meaning
Transmission Range Sensor B Circuit Intermittent
Powertrain system Generic code P28xx codes Check engine light
What P2804 means
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.
P2804 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 P2804
- MIL comes and goes, often with several transmission codes
- Gear display flickers
- Occasional shift system warning
Common causes of P2804
- Most likelyConnector not fully seated or pin pushed back
- PossibleHarness chafing that opens the circuit under vibration
- Less likelyWorn contacts or electronics inside the range sensor
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 P2804 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. |
| 04 | The exact fault in that area. |
What to do next
- Note P2804 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 P2804
What does P2804 mean?
P2804 means "Transmission Range Sensor B Circuit Intermittent". P2804 points to a B signal that drops out or jumps for short moments instead of failing permanently. It is a generic code, so it means the same on every make.
Is it safe to drive with P2804?
Drive gently and only to a workshop. With P2804 the car can go into limp mode (reduced power) to protect itself.
Will P2804 fail an emissions test?
Yes, it can. P2804 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 P2804 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2804 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.