ECU testing and diagnostics in South Wales

A suspected engine control unit fault needs investigation before a replacement is ordered. Llandow Tuning offers ECU fault analysis and bench testing, with the approach chosen for the vehicle, control unit and symptoms.

For an unresolved running problem, see engine diagnostics and fault finding. If the engine will not start, our starting-fault assessment considers the vehicle before assuming the ECU is defective.

Which problems can we investigate?

Contact us about loss of communication with the engine ECU, a suspected internal fault, problems following a software update, or a control unit that needs checking as part of a repair or custom build. We work with several platforms, including VAG, Ford and BMW; compatibility must be checked for the exact unit.

A fault code or communication error alone does not establish that the ECU has failed. The vehicle's power supply, wiring and connected components may need checking as part of the diagnosis. If the cause is unclear, our vehicle fault assessment is a useful starting point.

Vehicle testing or bench testing?

Testing on the vehicle lets us consider the ECU alongside the systems it controls. Bench testing isolates the unit for suitable checks and, where supported, simulation of vehicle conditions. The available tests depend on the ECU hardware and software.

Bench testing may not reproduce a fault that occurs only on the vehicle. Include logs and the conditions in which the fault appears so we can explain what the test can establish.

Repair, replacement and programming

Following investigation, the next step may be a wiring repair, further testing, ECU repair or a compatible replacement. Replacement modules can also require coding and programming. Testing does not automatically include these separate jobs.

What determines the cost?

Contact us before removing or posting the ECU. We will confirm the supported test, components required and quotation.