Powertrain, generic · Transmission

P0791 Intermediate Shaft Speed Sensor A Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The intermediate shaft speed sensor measures a shaft between input and output – a countershaft on Toyota's U760 six-speed, the intermediate shaft behind the overdrive set on Ford's 5R110W. Together with turbine and output speed it lets the module check each gear stage and control clutch slip. Ford uses P0791 as its only intermediate shaft code, for 'no or too little signal': while the vehicle drives under power (turbine at least 1500 rpm, output at least 650 rpm or 15 mph), the sensor reports below 250 rpm for 5 s – in the 2012 and 2020–23 summaries, with MIL. A Toyota bulletin for the U760 (Highlander, Venza, Camry 2009–10) replaces the countershaft sensor for P0791/P0793. GM's 10-speed has two such sensors but uses its own codes. Limp mode and harsh shifts follow.

Likely causes

Intermediate shaft speed sensor faulty
Connector or wire at the transmission (oil, corrosion, chafing)
Reluctor wheel damaged or debris on the sensor
Control module

Symptoms

  • Check engine light
  • Limp mode or fixed gear
  • Harsh or delayed shifts
  • Follow-up pressure control codes (Toyota)

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–600
Time1.5–3 h

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

Parts involved

intermediate shaft speed sensorsensor wiringtransmission control module

Related codes

P0792P0793P0794P0715P0720P0796

References: newtonnet.co.uk, fordservicecontent.com, http:.