P0614

What it means

P0614 means the engine control module and the transmission control module are not compatible with each other. The control units compare identification, configuration or calibration data over the communication network, and set the code when the data does not match or is not accepted. It is often seen after a module has been replaced, reprogrammed or fitted from another vehicle.

Symptoms

• Malfunction indicator lamp on, and often a transmission warning lamp too
• Transmission stuck in a limp-home gear or harsh, erratic shifting
• Reduced engine power or torque limiting
• Poor or no communication with the transmission control module on a scan
• Engine may not start or may refuse to move off in some cases
• Gear selector position not displayed correctly on the dashboard

Possible causes

• Recently replaced or second-hand engine or transmission control module with the wrong part number, software or configuration for the vehiclelikely
• Replacement module not programmed, coded or adapted to the vehicle after fittinglikely
• Outdated or incorrect calibration or software in one of the modules, where the manufacturer has issued an updatepossible
• Communication network fault between modules, such as damaged wiring, poor connectors or corrosion on the data linespossible
• Low battery voltage or poor earth or power supply causing corrupted data or failed handshakes between modulespossible
• Internal fault in the engine or transmission control module corrupting its stored identification datarare

How to diagnose

1. Read all stored codes and freeze frame data from every module, noting any network or communication codes alongside P0614
2. Find out whether either control module, or the engine or transmission, has been replaced, repaired or reprogrammed recently
3. Check the part numbers and software or calibration versions of both modules against the manufacturer's data for the exact model, engine and gearbox
4. Test battery condition and charging voltage, and check the main power and earth connections to both modules
5. Inspect the wiring and connectors for both modules and the data network for damage, water ingress, corrosion or pin tension problems
6. Check the network is working by confirming that all modules respond to a scan and looking for lost communication codes
7. Check for manufacturer service bulletins or software updates relating to this code for the vehicle
8. After any repair, clear the codes and road test, then recheck that the code has not returned

How to fix

• Fit the correct control module for the vehicle's model, engine and gearbox specification
• Program, code or adapt the replacement module to the vehicle using the manufacturer's approved procedure
• Update the module software or calibration to the latest manufacturer release where an outdated version is the cause
• Repair damaged wiring, connectors or earths on the data network and power supplies
• Correct battery or charging system faults, then repeat any programming that failed
• Replace a faulty control module only after wiring, supply and programming causes have been ruled out

Can I keep driving?

Nearby codes

• P0613GenericTCM Processor
• P0615GenericStarter Relay A Circuit