Powertrain, generic · Transmission

P0886 TCM Power Relay Control Circuit Low

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. P0886 means the coil control line is shorted to ground or the driver reports a short, so the relay pulls in unintentionally or the driver shuts down. No maker documents the code; its neighbours P0885 and P0887 are documented by Ford and FCA.

Likely causes

Control wire chafed to ground
Relay coil shorted
Module driver faulty

Symptoms

  • MIL on
  • Limp mode possible
  • Relay does not click or stays pulled in

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–400
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

P0885P0887P0888P0890

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