Transmission Range Sensor Circuit High Input
The transmission range sensor is reporting a higher input than expected.
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What it means (plain English)
The transmission range sensor tells the computer what gear the transmission is in, and it's saying it's receiving too high of a signal, which can mess up shifting.
What the computer is actually seeing
The transmission control module (TCM) expects a voltage range of about 0.5V to 4.5V from the range sensor based on gear selection. If it sees over 4.5V, it sets the P0708 code.
What a healthy reading looks like
Input voltage should be between 0.5V (Park) and 4.5V (Low).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the wiring and connectors for damage, corrosion, or loose connections to the transmission range sensor (first check).
- 2Using a multimeter, measure the voltage at the transmission range sensor connector. Expected voltage range is 0.5V to 4.5V (decision point: if voltage is above 4.5V, go to next step).
- 3Inspect the transmission range sensor itself for faults. If defective, replace the sensor (decision point: if sensor is good, suspect the TCM).
- 4Check TCM operation and integrity; use a scanner to read live data for other related transmission codes (decision point: if no faults found, update or replace TCM if defective).
Common causes
- Faulty transmission range sensor
- Damaged wiring to the sensor
- Corroded connectors
- Faulty transmission control module (TCM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's better to avoid driving until fixed, as shifting may become erratic, risking engine and transmission damage.
What other symptoms might I notice?
You may experience erratic shifting, a flashing check engine light, or transmission slipping.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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