P0850
PowertrainTransmissionmoderate severityPark/Neutral Switch Input Circuit
What P0850 Means
The PCM detects a fault in the park/neutral position switch input circuit. This can affect starting and shift interlock functions.
Symptoms
- No-start in park or neutral
- Incorrect gear indication
- Starter may not engage
Common Causes
- Faulty park/neutral switch
- Wiring open or short
- Corroded connector
- Faulty PCM
Diagnostic Steps
- Scan and record freeze frame data
- Verify gear position readings with scan tool
- Inspect switch wiring and connector
- Test switch continuity in each gear
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Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
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Serious DIY~$100
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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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