P0854: Drive Switch Input Circuit Low
What to do
Idle may sit higher than usual all the time, including in park. Harmless in itself but worth correcting, since a permanently raised idle costs a little fuel and adds wear at every standstill.
What this code means
The drive selection signal reads below its valid range, normally a short to ground, which the module takes as drive permanently selected. Idle is then held raised even in park and neutral, so the engine sits at a slightly high idle continuously — often the only symptom, and frequently attributed to something else entirely.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Faulty transmission range sensor · moderate
Less common
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
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Community experience
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