Fault code lookup

PowertrainP0863

Caution

Severity: Caution - get it checked when you can

TCM Communication Circuit

31 brands affected · Generic SAE J2012 description.

Key terms: SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

This range normally covers the transmission control system, but some manufacturers use P07-P09 codes for unrelated functions (fuel pump control, air-mix motors, lighting or windows). Check the description before assuming it is a transmission fault.

2Common causes

  1. Low or dirty transmission fluid
  2. Faulty shift solenoid
  3. Faulty speed sensor
  4. Wiring or connector fault
  5. Internal transmission wear

3Can I drive?

Caution · drive with care

If the transmission slips, jerks, will not shift, or a transmission temperature warning is on, stop driving and let it cool: continuing can cause expensive damage. If the code names a different system (for example the fuel pump), treat it on its own terms; a fuel-pump control failure can stall the car, so have it checked before driving further. Otherwise drive gently to a workshop.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 31

BrandCodeDescriptionSystem
Ashok Leyland CVP0863TCM Communication Circuit SAEPowertrain
BAIC MotorP0863TCM Communication Circuit BrandPowertrain
Mercedes-BenzP0863TCM Communication Circuit SAEPowertrain
BYDP0863TCM Communication Circuit BrandPowertrain
CheryP0863Shift time solenoid valve BrandPowertrain
DaewooP0863TCM Communication Circuit BrandPowertrain
DFFSP0863TCM Communication Circuit BrandPowertrain
DFFXP0863TCM Communication Circuit BrandPowertrain
DFXKP0863TCM Communication Circuit BrandPowertrain
EOBDP0863TCM-viestintapiiri BrandPowertrain
GeelyP0863TCM Communication Circuit BrandPowertrain
GMP0863TCM Communication Circuit BrandPowertrain
Great WallP0863TCM Communication Circuit BrandPowertrain
HafeiP0863TCM Communication Circuit BrandPowertrain
HoldenP0863Transmission Control Module Communication Circuit BrandPowertrain
HondaP0863TCM Communication Circuit SAEPowertrain
HyundaiP0863TCM Communication Circuit SAEPowertrain
IsuzuP0863TCM Communication Circuit SAEPowertrain
Land RoverP0863Serial back-up line timeout BrandPowertrain
MaseratiP0863TCM Communication Circuit SAEPowertrain
MitsubishiP0863TCM Communication Circuit SAEPowertrain
NissanP0863TCM Communication Circuit SAEPowertrain
OpelP0863TCM Communication Circuit BrandPowertrain
PeugeotP0863TCM Communication Circuit SAEPowertrain
ProtonP0863TCM Communication Circuit SAEPowertrain
SaabP0863TCM Communication Circuit BrandPowertrain
MG (SAIC)P0863TCM Communication Circuit BrandPowertrain
SmartP0863TCM Communication Circuit SAEPowertrain
SuzukiP0863TCM Communication - Supervision Software Failure BrandPowertrain
TataP0863TCM Communication Circuit BrandPowertrain
ToyotaP0863TCM communication circuit BrandPowertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Related codes

  • P0860 Gear Shift Control Module A Communication Circuit
  • P0861 Gear Shift Control Module A Communication Circuit Low
  • P0862 Gear Shift Control Module A Communication Circuit High
  • P0864 TCM Communication Circuit Range/Performance
  • P0865 TCM Communication Circuit Low
  • P0866 TCM Communication Circuit High
  • P0867 Transmission Fluid Pressure
  • P0868 Transmission Fluid Pressure Low
  • P0869 Transmission Fluid Pressure High
  • P086A Gear N switch sensor open circuit
  • P086B Gear N position sensor/Gear N switch implausible
  • P086C Gear N position sensor/Gear N switch signal voltage is low

Browse Pxxx codes or P086xx codes.

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