VW Transporter Glow Plug System Warning Signs Alert

Had a similar issue with my 2019 VW Crafter diesel last winter. As someone with some car maintenance experience, I initially thought it was just a single faulty glow plug causing the cold start problems and engine misfire symptoms. The preheating lamp behavior and smoke during acceleration matched exactly what you described. After attempting basic troubleshooting, I took it to my workshop where they ran a complete diagnostic on the heating element system. Turned out the issue wasnt the glow plugs themselves, but a damaged cable connection to the control unit causing intermittent failures. The repair involved replacing the wiring harness and checking all connections. Total cost was 95€ and it completely resolved the problems, no more warning lights, smoother cold starts, and normal acceleration. Before proceeding with any repairs, could you share: Current mileage on your Transporter, When did these symptoms first appear, Does the smoke color appear black, white, or blue, Are there any specific weather conditions when the problem gets worse This information would help determine if youre dealing with the same root cause or potentially a different issue within the diesel engine system.

Last service was completed just 2 months ago at 26268km and the warning lights started appearing shortly after. The smoke appears distinctly white during acceleration and gets significantly worse in cold weather. The vehicle stalling has become more frequent over the past week, especially during morning starts. Thanks for sharing your experience. After reading your repair details, I suspect my control unit wiring might also be compromised. The symptoms match closely, though the smoke color differs from what I initially described. Will get the heating element system checked at the workshop based on your feedback. Would you recommend any specific diagnostic tests I should request when I take it in?

Thanks for providing those details about your Transporter. On my Crafter, the white smoke and cold weather connection ultimately pointed to a combination of issues beyond just the wiring. The diagnostic test I specifically requested focused on the complete glow plug system, both the control unit and individual glow plugs. This revealed that while the wiring was the primary culprit, two glow plugs had also failed due to the intermittent power supply. The vehicle stalling you mentioned wasnt part of my symptoms, which suggests you might be dealing with a slightly different scenario. Given that these issues started after your recent service, I recommend having them check: Full glow plug resistance testing, Control unit signal output measurement, Intake system inspection (as white smoke often indicates incomplete combustion), Fuel pressure testing Total diagnostic costs ran about 150€ in my case, but it was worth pinpointing the exact issue before replacing parts unnecessarily. The combination of white smoke and cold start problems seems more complex than my initial wiring issue, so a thorough check is essential. Since your mileage is relatively low, this might also be warranty-covered depending on your service history. The check engine light combined with these symptoms definitely warrants professional attention soon to prevent potential long-term engine damage.

Since youve provided that level of detail about the diagnostic process, Ill definitely request those specific tests when I take it in. The fact that your issue involved both wiring and failed glow plugs really opens my eyes to checking the entire system rather than just assuming its the control unit. The white smoke during cold starts and vehicle stalling is becoming a real concern, especially with the engine light staying on. Ill get it checked this week before risking any diesel engine damage. Good point about the warranty coverage, will check my service documentation before booking the diagnostic tests. Those testing costs sound reasonable given how complex these heating element systems can be. My car maintenance knowledge is fairly basic, so having a clear list of what to ask for at the workshop is incredibly helpful. Will update once I know what they find during the diagnostic process. Thanks for breaking down your experience so thoroughly. It really helps narrow down where to start with the troubleshooting process.