Defective glow plug control unit / glow time control unit? The info!

Recently updated on December 20, 2022 at 11:06 am

How do you actually recognize a defect? Preglow control unit/glow time control unit and what repairs and costs are pending? We have the most important information! As a compression-ignition engine, a diesel engine does not require any in comparison to Otto engines (= “gasoline”) spark to ignite the fuel-air mixture. Instead, diesel engines are included glow plugs equipped to ensure that the temperature in the combustion chamber is sufficiently high during a cold start. In many vehicle models, the glow plugs are controlled by a separate one Controller (preglow control unit/relay). In addition to an electrical control unit fault, possible triggers for a defect in the preheating control unit are also water ingress.

Signs of a defect!

Serious symptoms are obvious longer engine start or a poorly starting and smoking diesel engine. Also a vehicle operating at low temperatures no longer starts, as well as a uneven engine running are rated as typical symptoms. Other clues are a reinforced Nail after launch as well as one continuous or not at all the glow plug lamp lights up in the instrument cluster. What other problems can be mistaken for a damaged glow plug control module? During the workshop diagnosis, it must first be determined whether there is actually a defect in the glow plug control unit. Besides, he has to Fault memory be read out.

Because behind the signs mentioned above, there is also one broken glow plug can get stuck, the experts first have to deal with one resistance tester check the correct operation of all glow plugs. Of course, another defect in the electronics can also be responsible for the problem. This can, for example, be damage to the voltage supply from the control unit or to the cable between the glow plug control unit and the glow plugs. Both problems must be ruled out as the cause. And whether the Main inspection is passed despite a defective preheating control unit, that depends on whether there is one Error in error memory there or not. If so, the error is mostly Emissions relevant. With such a significant deficiency, it unfortunately comes as a result Not pass the main investigation.

Repair or replace glow plug control unit?

If the diagnosis speaks for a defective glow plug control unit, it can be replaced with a new one. Depending on how much effort is involved in procurement and the cost of new parts, it may also make sense to use one repair to consider. Another option would be used auto parts that geprüft sold. Incidentally, the effort required for the change depends extremely on the design of the engine. On some models, the glow plug control unit is located directly on the fuse box, while on other series it is necessary to laboriously dismantle other attachments. On some vehicles, the glow plug control unit sits approximately behind the intake manifold. Such a change can be around three hours take advantage of. Finally, the new control unit still has to be taught in for some types.

How much does a new glow plug control unit cost?

The material costs for a new part usually vary between 50 and 500 euros, which of course also depends on the vehicle model and the spare parts manufacturer. Well-known spare parts manufacturers include Bosch, Beru and Hitachi. As time expenditure between 15 minutes and 3 hours factored in. At an hourly rate of 100 euros, the labor costs amount to 25 to 300 euros. In addition, costs for the diagnostic effort must be calculated. Overall, the price range of the total costs is comparatively high and can 75 to 800 euros plus diagnostic costs, which are billed depending on the individual time required.

The following note is essential: For safety reasons, tuningblog recommends all repair, inspection and maintenance work exclusively to be carried out in a specialist workshop! Although our information is summarized to the best of our knowledge and belief, we cannot assume any liability for the content. All information is therefore "without guarantee".

Of course, that wasn't the end of it!

In this tuningblog category there are guides and instructions for common defects/repairs on the vehicle and for installing accessories/tuning parts. Our articles explain in a simple way common defects and the corresponding repairs, as well as explaining how the first signs of a defect become noticeable. In most cases, we also have initial clues to the repair instructions in our repair instructions approximate The costs of the pending repair are listed. The goal of our subcategory “Auto Repair Guide“ is to create a head start in knowledge for the next visit to the workshop with initial tips. This may save you from tedious troubleshooting and small things can perhaps be done directly on your own. The same applies, of course, to the installation of accessories/tuning parts. Here, too, we would like to help with the implementation with instructions and tips. There are many other posts on this as well. Below is an excerpt of the last and HERE there are all previous instructions:

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