An electronic control unit (ECU) is any embedded system in automotive electronics that controls one or more of the electrical systems or subsystems in a vehicle.

Types of ECU include engine control module (ECM), Powertrain Control Module (PCM), Transmission Control Module (TCM), Brake Control Module (BCM or EBCM), Central Control Module (CCM), Body Control Module (BCM), Suspension Control Module (SCM), control unit, or control module. Taken together, these systems are sometimes referred to as the car’s computer (technically there is no single computer but multiple ones). Sometimes one assembly incorporates several of the individual control modules. In modern vehicles quantity of process controlled by control units, that makes driving more comfortable from one hand, but gives a trouble from other hand.

The EGR valve or Exhaust Gas Recirculation valve is also fitted with the aim of reducing emissions but if it is not kept clean can cause running issues and warning lights. This is because it carries Gases from the exhaust manifold back into the intake manifold whenever it is instructed to by the ECU, or on older vehicles just under certain running conditions. This means soot from the exhaust can and will build up, causing the valve to block up naturally which will cause warning lights or if left can cause the valve to stick open which will cause running issues.

EGR valve replacement is not as costly as DPF replacement but can be hassle and is a messy job, and similarly to the DPF is likely just to cause problems again in the future…why not just get rid of it. We often recommend on certain vehicles an EGR delete to compliment our remap anyway as it boosts throttle response and gets the vehicle in good health to make the most of all the new found power

The DPF or Diesel Particulate Filter is a filter fitted to diesel vehicles exhaust systems past 2009 under new ‘Euro 5’ standards that were introduced in an aim to reduce pollution. Unfortunately with vehicles that are not driven on long journeys often, the DPF can cause major issues as they don’t have a chance to regenerate and can block up if active regeneration instructed by the ECU doesn’t complete fully.

A warning light related to the DPF can be scary, as replacing the DPF can be very costly, and if your driving style doesn’t change you are likely to get problems again not to long after. We have alternative solutions which not only will fix the problem for good, but also give your vehicle a new burst of life.

TomTech Auto has advanced certified tools for reading and coding different types of electronic control units. Which provides secure and smooth process of programming original ECU or replacing for new or second hand parts