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9 Posts
Hey everybody. I'll start by saying I have a 2017 Chevy Colorado Diesel with about 140k miles, and no more warranty on it. A week before Thanksgiving I was driving home and the CEL light came on and not too long after the first Limp Mode warning:
Emissions System
Look in Owners Manual
175 Miles Until Your Speed Is Limited to 65 MPH
I call my mechanic who say's they are booked 3 weeks out. I make an appointment and figure I can still get around for a few weeks at 65MPH. However, when I get through the 175 mile countdown another window shows up and this time it says: 90 Miles Until Your Speed Is Limited to 55 MPH. So I think, well I guess I can just stay off the highways until my appointment. When that 90 miles ran out I get the stupidest thing I've ever seen in a vehicle: 75 Miles Until Your Speed Is Limited to 4 (YES, 4!) MPH. Unreal.
So, I decide to call Chevy dealership and see if I can get an appointment sooner than my mechanic. They tell me they can take a look at it the Fri/Sat after Thanksgiving. I say great and spend $200 to rent a car for a couple days. I drop my truck off to them and they pull the code from the CEL (which I had already done as well), and they say one of the NOx sensors needs to be replaced. I say ok, I figured as much and they go to work on it. Once they replace it they call me and say they are having a hard time clearing the CEL light and end up keeping my truck for 2-3 more days to try and get it to clear. Eventually after some Regen they were able to clear it.
I get my truck back and it seems to be fixed but later that week as I'm about 65 miles from my house on the highway no CEL light comes on but I get the dreaded 'Emissions System' warning on my dash. However, this time it goes straight to '75 Miles Until Your Speed Is Limited to 4 MPH' and starts limiting my speed to 55 mph while I was going 75 on the highway. No warning this time just immediately limited to the 55 MPH. I am able to get off the highway and take back roads home with just enough miles left to get it back to the shop.
I explain to them what happened and they say their diesel guy is on vacation for a week. They gave me a loaner which was nice and when he got back he called me and said that after talking to some GM techs they recommended that both NOx sensors be replaced at the same time and that could solve the issue. Also, to check the DEF Quality which was clear. So another $800 for the 2nd sensor to be installed and off I go.
Truck runs fine for almost 2 weeks and yesterday, 150 miles from home, CEL light comes on and the initial '175 miles...Until 65MPH' warning comes on again. What in the hell is wrong with this damn DEF system?!
Has anyone had this same exact issue/sequence of events? I'm so frustrated and rely heavily on reliable truck to haul and drive long distances. I'm probably going to end up bringing it back to the dealership but if anyone has any ideas as to what might be causing it I'd love to hear it before I do so I can give them some info as to where maybe the problem lies.
I loved my truck up until these past 2 months. Now I never want a modern diesel again. Unfortunately I can't afford to get a new vehicle currently.
Emissions System
Look in Owners Manual
175 Miles Until Your Speed Is Limited to 65 MPH
I call my mechanic who say's they are booked 3 weeks out. I make an appointment and figure I can still get around for a few weeks at 65MPH. However, when I get through the 175 mile countdown another window shows up and this time it says: 90 Miles Until Your Speed Is Limited to 55 MPH. So I think, well I guess I can just stay off the highways until my appointment. When that 90 miles ran out I get the stupidest thing I've ever seen in a vehicle: 75 Miles Until Your Speed Is Limited to 4 (YES, 4!) MPH. Unreal.
So, I decide to call Chevy dealership and see if I can get an appointment sooner than my mechanic. They tell me they can take a look at it the Fri/Sat after Thanksgiving. I say great and spend $200 to rent a car for a couple days. I drop my truck off to them and they pull the code from the CEL (which I had already done as well), and they say one of the NOx sensors needs to be replaced. I say ok, I figured as much and they go to work on it. Once they replace it they call me and say they are having a hard time clearing the CEL light and end up keeping my truck for 2-3 more days to try and get it to clear. Eventually after some Regen they were able to clear it.
I get my truck back and it seems to be fixed but later that week as I'm about 65 miles from my house on the highway no CEL light comes on but I get the dreaded 'Emissions System' warning on my dash. However, this time it goes straight to '75 Miles Until Your Speed Is Limited to 4 MPH' and starts limiting my speed to 55 mph while I was going 75 on the highway. No warning this time just immediately limited to the 55 MPH. I am able to get off the highway and take back roads home with just enough miles left to get it back to the shop.
I explain to them what happened and they say their diesel guy is on vacation for a week. They gave me a loaner which was nice and when he got back he called me and said that after talking to some GM techs they recommended that both NOx sensors be replaced at the same time and that could solve the issue. Also, to check the DEF Quality which was clear. So another $800 for the 2nd sensor to be installed and off I go.
Truck runs fine for almost 2 weeks and yesterday, 150 miles from home, CEL light comes on and the initial '175 miles...Until 65MPH' warning comes on again. What in the hell is wrong with this damn DEF system?!
Has anyone had this same exact issue/sequence of events? I'm so frustrated and rely heavily on reliable truck to haul and drive long distances. I'm probably going to end up bringing it back to the dealership but if anyone has any ideas as to what might be causing it I'd love to hear it before I do so I can give them some info as to where maybe the problem lies.
I loved my truck up until these past 2 months. Now I never want a modern diesel again. Unfortunately I can't afford to get a new vehicle currently.