Universal (All Makes) Vehicle (OBD-II)
Severity:Common Causes
- map[cause:Failed transmission range sensor stuck in the high voltage state]
- map[cause:Open circuit in the sensor A signal wire causing voltage to float high]
- map[cause:Misaligned transmission range sensor — common after transmission service]
- map[cause:Damaged wiring between the sensor and TCM]
- map[cause:Fluid contamination inside the sensor connector]
How to Fix It
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Check the gear position indicator on the dash — does it match the actual gear selected?
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Inspect the transmission range sensor connector for corrosion or fluid contamination.
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Test sensor A circuit voltage in each gear position — compare to expected values.
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Check the sensor alignment — adjust if it was recently disturbed during service.
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Replace the transmission range sensor if voltage is consistently abnormal.
Frequently Asked Questions
Will the car start if the range sensor is bad?
It depends on the failure mode. If the TCM thinks the car is in gear, the neutral safety switch won't allow starting. You may need to wiggle the shifter to find a position where the car will start.
Is the range sensor the same as the neutral safety switch?
Yes, on most vehicles they are the same component or integrated together. The sensor reports gear position, and the neutral safety function is built into that logic.
How much does a transmission range sensor cost?
Usually $30–$120 for the part. Installation is typically 1–2 hours. Proper alignment after replacement is essential to avoid further codes.