P1705

Code

Other P — Powertrain

Not in P or N During KOEO / KOER

Brand: Other

Type: P — Powertrain

Views: UK: 35 EN: 63 RU: 52

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Page language: EN

Causes

Faulty park/neutral position (PNP) switch or transmission range sensor
Damaged or corroded wiring or connector between PNP switch and PCM
Incorrect reference or ground to the PNP circuit (lost 5V reference or ground)
Shift linkage or selector misadjusted (mechanical not actually in P or N)
Intermittent connector/short to voltage or ground
PCM/TCM internal fault or software issue

Symptoms

No‑crank or starter inhibited when selector is in Park/Neutral
Malfunction Indicator Lamp (MIL) may be illuminated
Intermittent or permanent inability to start
Transmission may not shift or may behave as if in a different gear
DTCs related to transmission range or starter inhibit present

What to check

Scan for additional DTCs and freeze frame data; note KOEO/KOER conditions when code set
Visually inspect PNP switch connector and wiring for damage, corrosion or pin push‑out
Verify shift lever position and inspect/verify mechanical linkage/park pawl engagement
Check related fuses and engine/PCM grounds
Monitor live data for PRNDL / range sensor values with scan tool while moving selector through positions
Measure voltage at PNP switch and at PCM connector (with harness disconnected) to find opens/shorts

Signal parameters

Reference voltage to sensor typically ~5 V (varies by manufacturer); check factory spec
PNP signal typically toggles between near 0 V and near reference voltage when in P or N
Continuity between PNP switch terminal and PCM input should be present when in P/N (or specific resistance per spec)
No high resistance on ground or power feed; expected less than a few ohms for ground continuity

Diagnostic algorithm

Confirm conditions: Clear codes and attempt to reproduce P1705 with KOEO and KOER. Record live PRNDL/range values.
Inspect: Visually check the PNP switch, shifter linkage, connectors, and wiring for damage or corrosion.
Verify mechanical: Put shifter in Park and Neutral; confirm detents and that the transmission is mechanically in Park/Neutral.
Backprobe and measure: With KEY ON, backprobe the PNP switch terminals and PCM input. Verify reference voltage, signal voltage change when moving selector to P/N, and a good ground.
Continuity/resistance: With ignition OFF, check continuity between PNP switch terminals and PCM pins, and measure switch resistance across terminals when in P/N per service manual.
Wiggle test: With engine off and scanner monitoring PRNDL data, wiggle harness and connectors to check for intermittent faults.
Repair wiring or connector faults: Repair open/short/corrosion. Replace PNP switch if it fails bench or in‑vehicle tests.
Relearn/clear codes: After repairs clear codes, perform KOEO/KOER checks and a road test to confirm code does not return.
If circuit and switch test good and code persists, consider module diagnostics: check PCM grounds/power and consult manufacturer service info for PCM/TCM testing or software updates.

Likely causes

Failed/contaminated PNP (park/neutral) switch
Open or shorted wiring at the PNP connector (common failure on harness near shifter)
Shift selector not fully engaging Park or Neutral
Blown fuse or poor ground affecting sensor reference

Fault status

⚠️ Status

PCM reports transmission range input does not indicate Park or Neutral during Key On (engine off or running). Starter inhibit or shift safety logic may be engaged; inspection of PNP switch, wiring, shifter position, and module inputs is required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours