Powertrain, generic · Transmission

P0707 Transmission Range Sensor A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Signal wire shorted to ground (chafing at the transmission case)
Sensor faulty internally
Sensor supply missing (5 V reference, fuse)
Connector corroded or oil in the connector

Symptoms

  • 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

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission range sensorsensor wiringtransmission control module

Related codes

P0705P0706P0708P0709P2802P0642

References: law.cornell.edu, gsi.ext.gm.com, newtonnet.co.uk, saabwisonline.com.