GMC Savana Diesel DPF Failure Causing Black Exhaust

Had the same symptoms on a 2009 GMC Sierra diesel with comparable mileage. The exhaust back pressure sensor failure created similar warning lights and black smoke issues. Vehicle diagnostics confirmed the sensor was sending incorrect readings to the engine control module, preventing proper DPF regeneration cycles. The exhaust system problem required immediate attention because: Continued driving risks DPF damage, Engine performance becomes increasingly compromised, Fuel consumption increases significantly, Further damage to other emission control components possible The repair involved: Complete diagnostics scan, Replacement of faulty pressure sensor, Cleaning of DPF system, Reset of engine management system, Test drive to confirm proper regeneration cycle This was a serious issue requiring specialized diagnostic equipment and expertise with diesel emission systems. The symptoms worsen quickly if left unaddressed, potentially leading to complete DPF failure. The repair process took two full working days to complete properly. The black smoke during acceleration is a clear indicator that the exhaust system is not functioning correctly, matching exactly what happened with my Sierra before repair.

Thanks so much for sharing your experience with the GMC Sierra. Just wanted to check back since your exhaust sensor troubles sounded identical to what I encountered with my Savana. The back pressure issues and black smoke had me really worried. My auto repair shop confirmed similar emission control problems last week. Has everything worked properly since your repair? Also curious what the total cost ended up being, helps to know what to expect when I take mine in. Currently debating between two specialized diesel shops since my regular mechanic seems out of his depth with these DPF issues.

Just to follow up, happy to report everything has worked flawlessly since getting the exhaust back pressure sensor replaced. The repair cost came to 245 Euro total, which included the new sensor, labor, and a complete vehicle diagnostics check. The emission control system now functions perfectly with no more black smoke or warning lights. The DPF regeneration cycles complete normally, and fuel economy has improved noticeably. Getting a shop that really understands diesel emission systems made all the difference in properly diagnosing and fixing the pressure sensor malfunction. The repair was absolutely worth it to prevent potential damage to other components. Finding a specialist who properly understands exhaust system diagnostics is crucial, they should have the right equipment to properly test the back pressure readings and verify the fix. My advice would be to get it done soon at whichever specialized shop you choose. These sensor issues tend to cascade into bigger problems if left unchecked.

Since getting the repair done at the diesel specialist shop last month, I wanted to share how it went. The shop diagnosed the exact same exhaust sensor issue you mentioned. The vehicle diagnostics confirmed a faulty back pressure sensor that was causing the DPF regeneration failures. The repair took about a day and a half. They replaced the sensor, cleaned the entire exhaust system, and reset the engine performance settings. Total cost came to 290 Euro, which seemed fair given the specialized work involved. The black smoke is completely gone now and the engine warning light finally cleared. Vehicle emissions are back to normal and fuel economy has improved significantly. Really glad I went with a shop that properly understood diesel emission control systems rather than sticking with my regular mechanic who seemed unsure about the problem. Thanks again for helping me identify the issue. Having someone confirm the same symptoms gave me confidence to get it properly repaired before any major damage occurred.