OBD-II Generic Error Code P0708: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P0708
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P0708 indicates a high voltage signal from the transmission range sensor (also known as the neutral safety switch). This sensor tells your vehicle's computer which gear (Park, Reverse, Neutral, Drive) is selected. A fault can cause shifting issues, no-start conditions, or incorrect gear indications.
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Tools You'll Need

How to Fix Error Code P0708

  1. Check Transmission Fluid Level and Condition

    Use caution: transmission fluid can be hot. Let engine cool if necessary.

  2. Inspect Wiring and Connectors

    Disconnect the battery negative terminal before working on electrical components.

  3. Test the Sensor with a Multimeter

  4. Replace the Transmission Range Sensor

    Ensure the vehicle is securely supported. Use jack stands if needed.

  5. Clear the Code and Test Drive

    If the code persists, further diagnosis may be needed for internal transmission issues.

Parts You May Need

Transmission Range Sensor (Neutral Safety Switch)
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OBD2 Scanner
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Transmission Range Sensor (Neutral Safety Switch)
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OBD2 Scanner
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Transmission Range Sensor (Neutral Safety Switch)
Check Price on Amazon
OBD2 Scanner
Check Price on Amazon
Transmission Range Sensor (Neutral Safety Switch)
Check Price on Amazon
OBD2 Scanner
Check Price on Amazon
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When to Call a Professional

If the code returns after sensor replacement, or if you have symptoms like harsh shifting, slipping, or transmission overheating, consult a professional mechanic. Internal transmission problems require specialized tools and expertise.

Frequently Asked Questions

Can I drive with error code P0708?
It is not recommended. A faulty transmission range sensor can cause incorrect gear selection, no-start conditions, or transmission damage. Have it diagnosed and repaired promptly.
What does 'Transmission range sensor circuit high' mean?
It means the voltage signal from the sensor is higher than normal. This could be due to a faulty sensor, wiring issue, or short circuit.
Is the transmission range sensor the same as the neutral safety switch?
Yes, the transmission range sensor is often called the neutral safety switch or inhibitor switch. It serves the same function in many vehicles.
How much does it cost to fix P0708?
If DIY, the sensor costs $30-$150 and basic tools. A mechanic might charge $100-$250 for diagnosis and replacement, depending on vehicle.
What other codes might appear with P0708?
Related codes include P0705 (range sensor circuit malfunction) and P0706 (range sensor circuit range/performance).

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