P0866 - TCM Communication Circuit High
P0866 is a generic powertrain diagnostic trouble code indicating TCM Communication Circuit High. It relates to the Transmission system.
DTC Breakdown (SAE J2012)
| System | Powertrain (P) |
| Type | Generic |
| Subsystem | Transmission |
| Fault Index | 66 |
| Standard | SAE J2012 / ISO 15031-6 |
What does diagnostic code P0866 mean?
The dtc/">diagnostic trouble code P0866 represents TCM Communication Circuit High. This standard generic code points to a monitored fault condition in the vehicle's Powertrain network.
Detailed diagnostic guides and specific fix procedures for code P0866 are currently being compiled. Always verify check engine warnings with a qualified mechanic.
Frequently Asked Questions about P0866
What does P0866 mean?
The diagnostic trouble code P0866 represents TCM Communication Circuit High. This standard generic code points to a monitored fault condition in the vehicle's Powertrain network.
What is the system for P0866?
The P0866 code is located in the vehicle's Powertrain network.