A faulty ECM/PCM or TCM (both sources). A programming error, or TCM software that needs updating (both sources). Open or shorted wiring or connectors, including the CAN network harness (both sources list wiring). A failed power supply to the ECM or TCM, such as a fuse or relay (OBD-Codes.com). A poor control module ground (OBD-Codes.com).

Replace blown fuses or faulty relays in the module power supply. Repair poor grounds and damaged wiring or connectors. Update or reprogram the TCM or ECM/PCM software (RepairPal lists a TCM software update). Replace the faulty ECM/PCM or TCM, then program it to the vehicle (only after power, ground and wiring check out).

P0614🔧 Engine and transmission computers (ECM/TCM)Stop and fix promptly

P0614: ECM/TCM Incompatible (Meaning, Causes, Fixes)

Q: What does P0614 mean?

P0614 means the engine control module (ECM) and the transmission control module (TCM) don't agree with each other: the computer has found a compatibility problem between them. You may notice harsh or erratic shifting, stalling, a no-start or a speedometer that stops working. OBD-Codes.com says that, unlike most codes, P0614 is usually caused by a faulty computer or a programming (software) error, though power, ground and network wiring problems should be ruled out first. Many vehicles combine the ECM and TCM into one powertrain control module (PCM); others keep them separate. OBD-Codes.com explains that each time the ignition is turned on, the modules run self-tests and use the controller area network (CAN, the wiring the computers use to talk to each other) to check that they are interacting properly. If a discrepancy in ECM/TCM compatibility is found, P0614 is stored and the check engine light may come on, sometimes only after several failure cycles. RepairPal describes it more briefly: the code sets when the engine control module detects an incorrect signal related to the TCM, which controls the automatic transmission. The code is generic to OBD-II vehicles (1996 and newer); OBD-Codes.com names Ford, VW, Nissan, Volvo, Mazda and Audi among the makes that use it, and search interest shows people looking it up for Audi and Nissan, so check technical service bulletins (TSBs) for your vehicle.

Q: Can I keep driving with P0614?

Stop and fix promptly. Get it checked soon. RepairPal rates P0614 'Urgent', meaning immediate action is needed, and OBD-Codes.com says internal control module codes must always be taken seriously because this one can cause drivability and automatic transmission problems, including stalling or a no-start. Avoid long trips until it's diagnosed.

Reviewed 2026-10-26 · Based on 2 cited source(s)

What P0614 means

Many vehicles combine the ECM and TCM into one powertrain control module (PCM); others keep them separate. OBD-Codes.com explains that each time the ignition is turned on, the modules run self-tests and use the controller area network (CAN, the wiring the computers use to talk to each other) to check that they are interacting properly. If a discrepancy in ECM/TCM compatibility is found, P0614 is stored and the check engine light may come on, sometimes only after several failure cycles. RepairPal describes it more briefly: the code sets when the engine control module detects an incorrect signal related to the TCM, which controls the automatic transmission. The code is generic to OBD-II vehicles (1996 and newer); OBD-Codes.com names Ford, VW, Nissan, Volvo, Mazda and Audi among the makes that use it, and search interest shows people looking it up for Audi and Nissan, so check technical service bulletins (TSBs) for your vehicle.

Severity: can I keep driving?

Stop and fix promptly

Get it checked soon. RepairPal rates P0614 'Urgent', meaning immediate action is needed, and OBD-Codes.com says internal control module codes must always be taken seriously because this one can cause drivability and automatic transmission problems, including stalling or a no-start. Avoid long trips until it's diagnosed.

Common symptoms

Transmission not shifting properly, including harsh or erratic shifts (both sources)
Engine drivability problems (OBD-Codes.com)
Engine stalls or won't start (OBD-Codes.com)
Speedometer or odometer not working or reading wrong (OBD-Codes.com)
Other ECM or TCM codes stored (OBD-Codes.com)

Likely causes

Roughly most to least common, based on the sources below. Your vehicle may differ.

A faulty ECM/PCM or TCM (both sources)
A programming error, or TCM software that needs updating (both sources)
Open or shorted wiring or connectors, including the CAN network harness (both sources list wiring)
A failed power supply to the ECM or TCM, such as a fuse or relay (OBD-Codes.com)
A poor control module ground (OBD-Codes.com)

Diagnostic steps you can do

⚠ Before you start

Work on a cool engine, parked on level ground with the parking brake set. Never work under a car supported only by a jack.

Read all stored codes and freeze frame data and write them down. OBD-Codes.com says any ECM/TCM power supply codes should be fixed before diagnosing P0614.
Ask whether the ECM, PCM or TCM was recently replaced, reprogrammed or tuned, since both sources point to programming as a cause.
Check the fuses and relays that power the engine and transmission computers using your vehicle's fuse chart.
Inspect the wiring, connectors and engine and chassis ground connections for corrosion, looseness or damage, and check the modules for signs of water, heat or collision damage.
Look up TSBs for your year, make, model and engine that mention P0614 or a software update. OBD-Codes.com says the right TSB can help a lot.

Typical fixes

Replace blown fuses or faulty relays in the module power supply
Repair poor grounds and damaged wiring or connectors
Update or reprogram the TCM or ECM/PCM software (RepairPal lists a TCM software update)
Replace the faulty ECM/PCM or TCM, then program it to the vehicle (only after power, ground and wiring check out)

Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.

🛠 When to call a pro

OBD-Codes.com's approach: clear the codes and test drive; if the PCM enters readiness mode the fault is intermittent and harder to find. Test controller fuses with the circuit loaded, check ground integrity with a DVOM, and inspect controllers for water, heat or collision damage (a water-damaged controller should be considered defective).
A replacement controller will need reprogramming. OBD-Codes.com says some reprogrammed controllers can be bought from aftermarket sources, while others can only be programmed by a dealer or other qualified shop.
The sources differ in detail: OBD-Codes.com describes a compatibility check between the ECM and TCM over the CAN network and lists power supply and ground faults as causes, while RepairPal gives a one-line description (an incorrect signal between the modules) and lists only PCM failure, TCM failure, TCM software and wiring. RepairPal names only shifting problems as a symptom; OBD-Codes.com adds stalling, no-start and speedometer problems.

Where to buy

Plain search links. Always match parts to your exact year, make, model and engine.

OBD2 scanners on Amazon Parts at Advance Auto Parts catalog at RockAuto

FAQs

Can I drive with P0614?

It's not recommended for long. RepairPal rates it 'Urgent', and OBD-Codes.com says it can cause drivability and transmission problems, including stalling or a no-start.

Does P0614 mean I need a new computer?

Possibly. OBD-Codes.com says that, unlike most codes, P0614 is likely caused by a defective controller or a programming error, but power supply, ground and wiring should be checked first, and RepairPal lists a TCM software update as one fix.

Can P0614 appear after replacing the ECM or TCM?

Both sources list programming or software as a cause, and OBD-Codes.com says a replacement controller must be reprogrammed to the vehicle, so a mismatched or unprogrammed module is a likely suspect after a swap.

Sources

Last reviewed 2026-10-26. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.