Powertrain, generic · Transmission

P0887 TCM Power Relay Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Some gearboxes draw their power through a relay, such as the transmission control relay in Chrysler's fuse box that feeds the solenoids. P0885 to P0887 cover the coil control of that relay, P0888 to P0892 its sense line, which reads back the switched output and compares it with the command. A dead relay leaves all solenoids without power, so the gearbox drops into its hydraulic emergency gear. P0887 means the coil control line sits high: a short to voltage or voltage present despite the command. FCA's 948TE nine-speed in the 2014–15 Cherokee, Chrysler 200 and Ram ProMaster City stored it with MIL, and three bulletins cured it with a gearbox module reflash, so an over-sensitive detection can cause it too.

Likely causes

Gearbox module software (FCA 948TE)
Control wire shorted to voltage
Relay faulty
Gearbox module faulty

Symptoms

  • MIL on
  • Shift problems or limp mode

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–500
Time0.5–2 h

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

Parts involved

transmission relayrelay wiringfusetransmission control module

Related codes

P0885P0886P0891P0700

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.