Common Symptoms
- Check Engine Light illuminated
- Vehicle will not start or crank
- Transmission will not shift out of park
- Erratic or harsh transmission shifting
- Speedometer or gear position display intermittent or incorrect
- Vehicle starts in gears other than park or neutral
Most Likely Root Causes
- Faulty transmission range sensor or neutral safety switch
- Misadjusted transmission range sensor linkage or bracket
- Damaged or corroded wiring harness at transmission range sensor connector
- Worn or damaged transmission shift linkage causing incorrect sensor position
- Failed transmission control module or internal wiring fault
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Component Location
The transmission range sensor is typically mounted on the side or top of the transmission housing near the manual shift shaft or valve body.
Manufacturer Notes
Some manufacturers require specific transmission range sensor relearning or adaptation procedures after replacement or adjustment to clear this code.
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Heavy-duty trucks often throw both OBD-II and J1939 faults simultaneously. AI Diesel Tech handles both protocols in a single guided session.
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