P0614 ECM/TCM Incompatible

P0614 indicates ECM and TCM incompatibility. The engine and transmission controllers are not agreeing on calibration, identification, communication, or vehicle configuration.

Code details

Generic OBD-II · P0

System: Computer
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace mechanical transmission parts for P0614 until module compatibility and programming are corrected.

Symptoms of P0614

Check-engine light, sometimes with several unrelated codes at once.
Warning lights, a no-start, or intermittent electrical faults.
Communication or module-reset problems on a scan tool.

Common causes of P0614

Low battery voltage, poor grounds, corroded connectors, or blown fuses.
Wiring or network (CAN bus) faults between modules.
A module software/programming issue, or rarely a failed controller.

Useful checks before replacing parts

Compare ECM and TCM part numbers, VIN data, calibration levels, option coding, communication status, immobilizer data, and recent module replacement history.
Inspect CAN network faults, power and ground stability, programming records, mismatch codes in other modules, and configuration values in both controllers.
Perform required programming, relearn, or setup procedures only after confirming both modules are correct for the vehicle.

Related OBD-II codes

These nearby computer entries can help compare wording and pin down the fault area.