Powertrain, generic · Transmission

P0717 Input/Turbine Shaft Speed Sensor A Circuit No Signal

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The input or turbine shaft speed sensor – a Hall sensor with square-wave output or an inductive sensor with sine output – reports the speed behind the torque converter. With output and engine speed it gives the actual gear ratio, converter slip and shift timing. P0717 means there is practically no input speed signal although the vehicle is driving under power. GM's 2025 modules flag under 200 rpm for more than 4 s with torque applied, the 6T70 under 50 rpm for 5 s, the Allison 1000 under 61 rpm with output above 500 rpm; Ford under 200 rpm for 5–30 s; all after one trip. GM calls it 'circuit low voltage', but means missing frequency. On GM's 10-speed both input and output sensors share a supply – P0717 together with P0722 points to that supply rather than two sensors.

Likely causes

Speed sensor faulty (Hall IC or coil open or shorted)
Connector or harness corroded, chafed or loose pins (with internal sensors also the pass-through connector)
Metal debris on the sensor magnet or damaged reluctor wheel
Transmission module or its sensor supply faulty

Symptoms

  • Check engine and/or transmission warning lamp
  • Limp mode with fixed gear, harsh shifts
  • Torque converter clutch does not apply
  • Input speed shows 0 or implausible in the scan tool

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,500
Time1–8 h

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

Parts involved

input speed sensorsensor wiringtransmission control module

Related codes

P0715P0716P0718P0722P0700

References: saabwisonline.com, gsi.ext.gm.com, saabwisonline.com, fordservicecontent.com.