Transmission Range Sensor Circuit Malfunction (PRNDL Input)
What does P0705 mean?
The P0705 code means the vehicle's onboard diagnostic system has detected: Transmission Range Sensor Circuit Malfunction (PRNDL Input). This is a critical severity code.
Common Symptoms
- Check Engine Light illuminated
- Incorrect gear displayed on dashboard
- Transmission shifts erratically
- Vehicle may not start
- Reverse lights may not work
Probable Causes (Ranked by Likelihood)
- Faulty transmission range sensor (neutral safety switch) Very High
- Misadjusted range sensor or shift linkage High
- Damaged range sensor wiring or connector Moderate
- TCM range sensor input circuit fault Low
Step-by-Step Diagnostic Procedure
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Shift through all positions and monitor the range sensor PID on a scan tool
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Inspect the range sensor connector on the transmission for corrosion
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Check range sensor adjustment -- it may have slipped out of position
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Measure range sensor resistance or voltage in each position
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Inspect the shift cable or linkage for looseness or wear
Frequently Asked Questions
Can I drive with code P0705?
Drive short distances only with extreme caution. The TCM may not know what gear is selected, leading to unpredictable shifting.
What is the transmission range sensor?
The transmission range sensor (also called neutral safety switch) tells the TCM which gear position the shift lever is in. It is critical for proper gear selection and starting.
Can a loose shift cable cause P0705?
Yes. A stretched or loose shift cable can cause the range sensor to be misaligned with the actual shift lever position.