P0708Transmission Range Sensor A Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The transmission range sensor (selector or multifunction switch, PRNDL) reports the selected range; it may be a multi-contact switch with a bit pattern per position, an analog sensor with two opposing voltages adding up to 5 V, or a contactless PWM sensor. Its second channel has its own codes (P2801–P2805). P0708 means the sensor A signal is too high – a short to voltage or, depending on the circuit, an open line pulled up. GM's T87A transmission module flags a PWM duty cycle above 91.2 % for 1.8 s within 2.25 s, lamp in the first trip; Ford flags a duty cycle above 90 %, an analog sensor above 4.8 V for 5 s, a dual-analog channel above 4.84 V for 200 ms, and explicitly an open circuit on its digital sensor (all switches open, e.g. unplugged); Saab's 9-5 (9650) above 4.87 V for 100 ms twice, with 2nd gear held and a restart interlock.
- What you may notice
- Check engine and/or transmission warning lamp
- Transmission limp mode, fixed gear, harsh shifts
- Starting problems in P/N or start interlock
- Wrong gear indication, reversing light not working
- Likely causes
- LikelySensor connector off or signal/ground wire open
- PossibleSignal wire shorted to voltage
- PossibleSensor faulty internally
- RarePoor sensor or transmission ground
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.