P0855 code meaning
Drive Switch Input Circuit High
What P0855 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. P0855 means the D signal stays at a high level: an open wire with the pull-up lifting the input, a short to voltage or a contact that no longer closes.
P0855 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 P0855
- Fault stored, MIL depending on maker
- Gear indicator wrong
- Cruise control not working
Common causes of P0855
- Most likelySignal or ground wire open
- PossibleContact worn or misadjusted, does not close
- Less likelyShort to voltage
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 P0855 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. |
| 55 | The exact fault in that area. |
What to do next
- Note P0855 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 P0855
What does P0855 mean?
P0855 means "Drive Switch Input Circuit High". 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 P0855?
Drive gently and only to a workshop. With P0855 the car can go into limp mode (reduced power) to protect itself.
Will P0855 fail an emissions test?
P0855 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 P0855 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P0855 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.