P0705: Transmission Range Sensor Circuit Malfunction (PRNDL Input)
The Transmission Range Sensor (Neutral Safety Switch / PRNDL switch) informs the ECM/TCM what gear position the shifter is in. P0705 occurs when the switch reports an invalid combination (e.g. signaling both Reverse and Drive simultaneously).
Driveability & Safety Advisory
Vehicle may refuse to engage starter motor (No-Crank) or transmission will default to 3rd gear.
Official Manufacturer TSB Advisories
Factory Condition: Park/Neutral position switch contacts corrode from road salt and water intrusion.
Physical Component Location & Service Access
Mounted on the outside of the transmission case where the manual shift linkage connects.
Electrical Specifications & Live PID Benchmarks
Scan Tool Live Data Targets
Digital Multimeter (DMM) Specs
Documented Model-Specific Case Studies
Root Cause: Lead frame transmission range sensor failure.
Verified Fix: Replace lead frame assembly.
Technician Inspection & Testing Workflow
Observe gear indicator on dash while moving shifter.
Check if vehicle cranks in Neutral.
Test switch continuity on transmission case.
Recommended Diagnostic Tools & Verified Parts
BlueDriver Bluetooth Pro OBDII Scan Tool
Wireless sensor telemetry & enhanced diagnostics (Engine, ABS, Airbag). Delivers verified vehicle repair reports.
Autel AutoLink AL519 / AL319 OBD2 Scanner
Color screen standalone scanner. One-click I/M emissions readiness status, freeze-frame data, live DTC reset.
AstroAI Digital Multimeter 6000 Counts TRMS
Auto-ranging multimeter for measuring sensor pin resistance (ohms), live DC bias voltage, and circuit continuity per OEM specs.
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Cost Breakdown
Tools & Parts Matrix
Diagnostic Questions & Answers
Why won't my car start until I jiggle the shifter in Neutral?
This is the classic symptom of a worn Transmission Range Sensor whose Park contacts have worn out.