P0854 code meaning
Drive Switch Input Circuit Low
What P0854 means
The drive switch input reports to the engine or gearbox module that range D is selected, usually through its own contact in the range switch or selector next to the park/neutral contact. No maker documents these codes; GM's tables up to 2025, Ford's summaries and Saab service data were searched. The description follows California's rule for inputs, circuit and plausibility checks, and the documented park/neutral input, which is checked against the gearbox module's range. P0854 means the D signal stays at a low level: a short to ground or a contact stuck in its grounded state. Which range then appears wrongly depends on how the contact is wired.
P0854 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0854
- Fault stored, MIL depending on maker
- Gear indicator wrong
- Cruise control not working
Common causes of P0854
- Most likelySignal wire shorted to ground
- PossibleContact stuck closed
- Less likelyModule input
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Transmission range sensorGear lever switchSwitch wiringEngine control module
What each part of P0854 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8 | Area: transmission. |
| 54 | The exact fault in that area. |
What to do next
- Note P0854 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 P0854
What does P0854 mean?
P0854 means "Drive Switch Input Circuit Low". The drive switch input reports to the engine or gearbox module that range D is selected, usually through its own contact in the range switch or selector next to the park/neutral contact. It is a generic code, so it means the same on every make.
Is it safe to drive with P0854?
Drive gently and only to a workshop. With P0854 the car can go into limp mode (reduced power) to protect itself.
Will P0854 fail an emissions test?
P0854 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0854 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P0854 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.