Powertrain, generic · Transmission

P087A Clutch Position Sensor B Circuit

Check engine lightOn

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

Clutch position sensor B reports the position of the second clutch or its actuator, the counterpart of sensor A (P0805 ff). The only documented user is Ford's dry DPS6 dual clutch in Fiesta and Focus: clutch B, for reverse and the even gears, is moved by a three-phase motor whose Hall sensors give its position, and the gearbox module drives it through an internal motor driver. Ford sets P087A for a fault in that internal driver; wiring faults of the motor have their own codes (P090A, P090C, P090D). Ford's warranty extension 19N07 covers replacing the gearbox module when it is the cause, which is common here. Clutch B can then no longer be controlled safely.

Likely causes

Gearbox module faulty internally (motor driver)

Water or corrosion at the gearbox module connector

Clutch B motor or its wiring faulty

Weak supply to the gearbox module

Symptoms

MIL or transmission warning on
Jerky take-off or shifts
Reverse or even gears missing, limp mode

Repair estimate

DifficultyHardWorkshop job

Parts and labour€400–1,300

Time1–2.5 h

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

Parts involved

clutch position sensorclutch actuator motorsensor wiringtransmission control module

Related codes

P0805 P087B P087E P090A P090C P090D

References: newtonnet.co.uk, static.nhtsa.gov.