Exhaust particulate filter (EPF).
I'm unclear what happens if you are unable to complete the regeneration of the EPF. The dealer and GMs customer service claim that when the "Cleaning Exhaust Filter Continue Driving” appears on DIC, "you must" continue driving until the regeneration cycle is complete or a Diagnostic Trouble Code will be created, requiring service at the dealer to remedy. My reply was let's get this straight -- a regeneration starts 5 minutes before I arrive at work and GM expects me to continue driving for 20-30 minutes to complete the regeneration. GMs reply is yes the regeneration must be completed. I've come across some wording on a mechanics reference document that says if the first regeneration is interrupted a second warning will appear on the DIC after restart, stating, "Cleaning Exhaust Filter Must Continue Driving” message is displayed, and that if the regeneration is not allowed to complete after this notice a Diagnostic trouble code will then be created. I would appreciate some clarification from owners. Has anyone failed to complete the first regen announcement or both and what are the ramifications. Thank you.
01--17-2017
So I guess nothing has changed in the 20 plus years since I've owned a GM product. The manual that describes the 2.8 and its operation is worthless. Owners are not having the regeneration warnings displayed on the DIC, as described, and "Customer Service" can only repeat the apparent misinformation in the Duramax Supplement. CS is offshore and its been difficult getting them to understand the questions I have about the 2.8 let alone provide an answer. They have given me completely different answers to the same question in different phone calls, and refuse to provide a link to substantiate their answers. As I've told CS, I don't expect you to have the answers to my questions, but I do expect you to forward the questions to an appropriate department in GM and then provide an answer. They refuse or are unable to reach out within the corporation for answers to question that should be addressed in the manual. So my best option is reach out to owners of the 2.8.
Below, if you are further interested are excerpts from the Duramax supplement provided with the vehicle, describing what should happen when a regeneration is taking place.
Cleaning the DPF (Exhaust Filter) (From pg. 6 of Duramax Diesel supplement that comes w the vehicle.)
While the DPF cleaning is automatically controlled by the engine computer, the vehicle will need to operate continuously until the message is no longer displayed.
The engine computer has been designed to continuously monitor the condition of the DPF. When the engine computer detects that the DPF is nearly full of particulates and that the vehicle is not being operated in a manner that would allow effective automatic DPF cleaning, the Driver Information Center (DIC) will display a message. (Pg. 7)
Diesel Particulate Filter
Messages (from pg. 23)
CLEANING EXHAUST FILTER CONTINUE DRIVING (4-Cylinder Pickups and Uplevel 8-Cylinder Pickups) or DIESEL PARTIC FILTER IS FULL CONTINUE DRIVING (Base Level 8-Cylinder Pickups) or CLEANING EXHAUST FILTER KEEP DRIVING UNTIL MESSAGE IS CLEARED (Vans)
This message will appear on the DIC when an exhaust particulate filter cleaning is required. To clean the filter, drive the vehicle above 50 km/h (30 mph) until the warning message goes off. This will take about 30 minutes.
If the filter is not cleaned, the malfunction indicator lamp will come on and the ENGINE POWER IS REDUCED message will be displayed. Vehicle performance will be limited. See Diesel Particulate Filter 0 38.
I'm unclear what happens if you are unable to complete the regeneration of the EPF. The dealer and GMs customer service claim that when the "Cleaning Exhaust Filter Continue Driving” appears on DIC, "you must" continue driving until the regeneration cycle is complete or a Diagnostic Trouble Code will be created, requiring service at the dealer to remedy. My reply was let's get this straight -- a regeneration starts 5 minutes before I arrive at work and GM expects me to continue driving for 20-30 minutes to complete the regeneration. GMs reply is yes the regeneration must be completed. I've come across some wording on a mechanics reference document that says if the first regeneration is interrupted a second warning will appear on the DIC after restart, stating, "Cleaning Exhaust Filter Must Continue Driving” message is displayed, and that if the regeneration is not allowed to complete after this notice a Diagnostic trouble code will then be created. I would appreciate some clarification from owners. Has anyone failed to complete the first regen announcement or both and what are the ramifications. Thank you.
01--17-2017
So I guess nothing has changed in the 20 plus years since I've owned a GM product. The manual that describes the 2.8 and its operation is worthless. Owners are not having the regeneration warnings displayed on the DIC, as described, and "Customer Service" can only repeat the apparent misinformation in the Duramax Supplement. CS is offshore and its been difficult getting them to understand the questions I have about the 2.8 let alone provide an answer. They have given me completely different answers to the same question in different phone calls, and refuse to provide a link to substantiate their answers. As I've told CS, I don't expect you to have the answers to my questions, but I do expect you to forward the questions to an appropriate department in GM and then provide an answer. They refuse or are unable to reach out within the corporation for answers to question that should be addressed in the manual. So my best option is reach out to owners of the 2.8.
Below, if you are further interested are excerpts from the Duramax supplement provided with the vehicle, describing what should happen when a regeneration is taking place.
Cleaning the DPF (Exhaust Filter) (From pg. 6 of Duramax Diesel supplement that comes w the vehicle.)
While the DPF cleaning is automatically controlled by the engine computer, the vehicle will need to operate continuously until the message is no longer displayed.
The engine computer has been designed to continuously monitor the condition of the DPF. When the engine computer detects that the DPF is nearly full of particulates and that the vehicle is not being operated in a manner that would allow effective automatic DPF cleaning, the Driver Information Center (DIC) will display a message. (Pg. 7)
Diesel Particulate Filter
Messages (from pg. 23)
CLEANING EXHAUST FILTER CONTINUE DRIVING (4-Cylinder Pickups and Uplevel 8-Cylinder Pickups) or DIESEL PARTIC FILTER IS FULL CONTINUE DRIVING (Base Level 8-Cylinder Pickups) or CLEANING EXHAUST FILTER KEEP DRIVING UNTIL MESSAGE IS CLEARED (Vans)
This message will appear on the DIC when an exhaust particulate filter cleaning is required. To clean the filter, drive the vehicle above 50 km/h (30 mph) until the warning message goes off. This will take about 30 minutes.
If the filter is not cleaned, the malfunction indicator lamp will come on and the ENGINE POWER IS REDUCED message will be displayed. Vehicle performance will be limited. See Diesel Particulate Filter 0 38.