P0614
ECM/TCM Incompatible
ECM / TCM / internal module
Generic OBD-II
High
What it means
P0614 means the engine control module (ECM) and transmission control module (TCM) report that they are not compatible — their identification or calibration doesn't match. It most often appears right after a module has been replaced or reprogrammed with the wrong software. The transmission may shift poorly or go into limp mode, and some vehicles will not start until the mismatch is corrected.
High
Can I keep driving? Have it diagnosed before driving far — the transmission may be stuck in a default gear or limp mode, and in some cases the engine won't start.
Common symptoms
What you'll notice
- Check-engine light on
- Transmission shifting problems or reduced-power (limp) mode
- Harsh, delayed, or missing shifts
- No-start or crank-no-start in some cases
Common causes
Most likely first
- Mismatched or incorrectly programmed ECM or TCM — often right after a module swap or reflashLikely
- Wrong part-number module installed for the vehicleCommon
- Communication wiring fault between the ECM and TCMCommon
- Corroded or loose module connectorsLess often
How to diagnose & fix
Work through it in order
- Verify the ECM and TCM part numbers and calibrations match the VIN — this is the usual cause after service.
- Reprogram/flash the module(s) to the correct software for the vehicle.
- Inspect the ECM-TCM communication (CAN) wiring and connectors.
- If the wrong module was fitted, install the correct one and program it. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0614?+
Not really. The transmission may default to a safe gear or limp mode, and some vehicles won't start. Get the module compatibility resolved first.
Can I just clear P0614?+
No — it returns immediately because the two modules still report as incompatible. The fix is correct programming or the right module, not clearing.
Related codes
Often seen with P0614
Read & clear P0614 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX