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Discussion Starter #1 (Edited)
2017 Canyon diesel was new in May 2017. 6 times since then it has flipped the DEF and ENGINE codes and each time went to the dealership
1st - cleaned emission sensor
2nd - cleaned emission sensor
3rd - replaced sensor 2
4th - cleaned senor and did upgrade on system
5th - replaced sensor 1
6th - replaced DEF pump and heater system

Fingers crossed.

Well it continues

The truck ran 300 km and blew the DEF line and leaked all the DEF. No parts were available so the dealer took the line off a new 2018 on the lot. 200 km later it blew that line and leaked all the DEF fluid

1 month waiting for part. The part now has a new part number and is thought by Service to have been remanufactured. DEF injector replaced at this time.

2000 km later flipped all the codes again. This time they are replacing the catalytic converter and the DEF injector. They feel the catalytic converter may be saturated.

Local dealer has 4 diesel Canyons waiting for parts.
 

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Keep us informed please, a lot of folks (like me) watch these threads because this is a relatively new model/engine, and the whole DEF/DPF emissions setup has appeared to be rather sensitive to just a bout anything industry wide :(

Rant: The new electronics and emissions complexities have all but annihilated any hope of having that legendary lifespan, mileage, and trouble-free reputation of diesels of yore.

With that said: I bought a 2017 in 2/2017 and have had NO emissions issues yet but buy my fuel at stations here in the Northwest that cycle through a lot of it daily/weekly like Costco or Fred Myer's.
 

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What EKarlW said. Also, since the thread head is "DEF issues", here's mine. For the last ~3 weeks I've noticed ~4 times what seems to be dried DEF on the inside of my fillup lid, and on the body below it. FYI, it's my pic vehicle, a 2018 CCLB Z71. When I added a gallon ~1500 miles ago it didn't fill it, and my indicator shows that I have "enough" That is, not too full, not too empty. My lid is properly threaded. I'm going for my 2nd service next week and will try and get this solved. But is there anything that I can encourage them to check. My dealer is aways away and I want to avoid multiple trips while they just try stuff.

Thanks all
 

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My 2018 colorado was 4 months when some sensor went by the time they got the new one the particaler filter was plugged. Now it's sitting in the shop for 6 weeks and counting waiting for a DEF heating element. Gm located the part at least 3 weeks ago and the dealer ship is still waiting for it too come in
 

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I had the complete system replaced. The only part that was factory, was the tank/heater. My tech. told me that GM had a batch of feed lines (from tank to DEF) that were defective and the fix was to have them replaced. Once that was replaced, no issues (knocking on wood now!). Good luck with your truck:D Mac
 

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My 2018 colorado was 4 months when some sensor went by the time they got the new one the particaler filter was plugged. Now it's sitting in the shop for 6 weeks and counting waiting for a DEF heating element. Gm located the part at least 3 weeks ago and the dealer ship is still waiting for it too come in
The problem I can understand. The wait, not. Unless they're lending you a replacement in kind over that 6 weeks, I'd raise holy hell. Including Yelp, BBB, the Nextdoor site for the neighborhood of the dealer, and telling us the name of your dealer in this forum.
 

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The problem I can understand. The wait, not. Unless they're lending you a replacement in kind over that 6 weeks, I'd raise holy hell. Including Yelp, BBB, the Nextdoor site for the neighborhood of the dealer, and telling us the name of your dealer in this forum.
The deal is macintyre's in sydney nova scotia. The problem wasn't with them but they didn't do me any favors neither other than driving me up to the rental place. My biggest complaint is when GM.ca tells me they located the part and it still took almost a month to get it to my dealer. One story i got it was at another dealer in canada or US they didn't know (or wouldn't tell me) and GM had to get from them and ship it here. I think they had to wait for someone in mexico or china to make it first then send it
 
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