P0708 — Transmission Range Sensor Circuit High Input
Drivable short-term, but fix now to avoid damage.
What P0708 means
This code means the transmission range sensor circuit is sending a signal voltage that's too high, often due to a short to power or a high-resistance connection. Because the sensor reports your shifter position, a high signal can confuse the computer about which gear is selected. Typical repairs involve fixing the wiring or connectors and, if needed, replacing the range sensor.
Common symptoms
- Check engine light is on
- Gear indicator shows the wrong gear
- Harsh or incorrect shifting
- Engine may not crank in Park or Neutral
- Transmission falls into limp mode
Common causes
- Short to power in the sensor wiring
- High-resistance or corroded connection
- Open ground in the sensor circuit
- Faulty transmission range sensor
- Failing transmission control module
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0708 code?
It's best to limit driving. A high sensor signal can cause incorrect shifting or starting problems, so have it diagnosed before depending on the car.
How much does it cost to fix a P0708 code?
Wiring or connector repairs may cost $100 to $250. Replacing the range sensor with diagnosis typically runs $300 to $500.
Is a P0708 code serious?
Yes. Like other range sensor codes, it affects gear selection and starting, which are safety concerns, so it should be addressed promptly.
What does high input mean for P0708?
High input means the sensor's signal voltage climbed above the normal range, usually from a short to power or a corroded, high-resistance connection. The computer can't trust the gear reading and sets the code.