P0854
PowertrainTransmissionlow severityDrive Switch Input Circuit Low
What P0854 Means
The PCM sees a low voltage on the drive switch input circuit. This can cause the system to misread the driver's mode selection.
Symptoms
- Drive mode fails to engage
- Dash warning light
- Unexpected shift behavior
Common Causes
- Faulty drive switch
- Short to ground in wiring
- Poor connector contact
- Failed control module
Diagnostic Steps
- Scan for codes and freeze frame
- Inspect drive switch connector
- Measure signal voltage with meter
- Replace switch if faulty
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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Community Confirmed Fixes
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