Software Incompatibility with Throttle Actuator Control Module

Possible causes

• CommonThe throttle actuator control module replaced but never programmed or coded to this vehicle
• CommonUsed module fitted from a different vehicle or engine variant
• CommonSoftware update interrupted during programming
• CommonWrong part number for the engine variant
• CommonThrottle body replaced without the required adaptation or coding
• PossibleAftermarket tuning device altering what the module reports

What you might notice

• Reduced power - limp-home mode
• Engine will not rev beyond a low limit
• Warning light for reduced engine power
• Engine may not start
• Fault present since a repair

What to check, in order

1. Be aware that the vehicle will not deliver full power. Avoid overtaking, motorway slip roads and anything else that needs the car to respond.
2. Ask what was done. A throttle body or engine module replacement immediately before this appeared is the explanation.
3. Check whether a throttle adaptation was required and skipped after fitting.
4. Read the module's software and part numbers against the engine variant, not just the model.
5. Ask whether a tuning box or remap has been fitted. These are a real cause and are often not mentioned until asked directly.
6. This needs manufacturer-level programming rather than a replacement part.