P0707Transmission Range Sensor A Circuit Low
- 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). P0707 means the sensor A signal is too low – usually a short to ground or lost supply. GM's T87A transmission module flags a PWM duty cycle below 8.8 % for 0.5 s within 1.5 s, with the lamp in the first trip; Ford flags a duty cycle below 10 %, an analog sensor below 0.2 V for 5 s or a dual-analog channel below 0.127 V for 200 ms; Saab's 9-5 (9650) below 0.127 V for 100 ms twice. 'Low' refers to the signal, not to a gear.
- 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
- LikelySignal wire shorted to ground (chafing at the transmission case)
- PossibleSensor faulty internally
- PossibleSensor supply missing (5 V reference, fuse)
- RareConnector corroded or oil in the connector
- 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.