General Motors has issued a service update for certain 2021 Chevy Silverado HD and 2021 GMC Sierra HD pickups that may have been delivered with a damaged diesel nitrogen oxide sensor.
The problem: in affected trucks, the 6.6L L5P V8 Duramax diesel engine may have a damaged nitrogen oxide sensor connector wire.
The hazards: a nitrogen oxide sensor is used to monitor the level of nitrogen oxide being emitted by a diesel vehicle to ensure compliance with state and federal emissions regulations. A damaged or faulty nitrogen oxide sensor can cause the vehicle to produce fault codes and can also result in a warning light illuminating on the instrument cluster. GM did not say what kind of issues owners of vehicles affected by this particular problem can expect, however.
The fix: dealers are instructed to replace the ‘Position 2’ nitrogen oxide sensor in affected vehicles. These repairs will be done at no cost to the vehicle owner.
Affected components: nitrogen oxide sensor (Position 2)
Affected vehicles:
- 2020 GMC Sierra HD (with 6.6L L5P Duramax diesel engine)
- 2020 Chevy Silverado HD (with 6.6L L5P Duramax diesel engine)
Next steps: GM will notify owners of affected vehicles and instruct them to make an appointment with their dealership. Owners can also use the contact information below to reach out to Chevy or GMC customer service with any questions or concerns they may have. This service update will expire at the end of the GM New Vehicle Limited Warranty Period for affected vehicles, which is valid for up to three years or 36,000 miles.
Contacts:
- GM Customer Satisfaction Program number: N212318850
- Chevrolet Customer Service: 1-800-222-1020
- GMC Customer Service: 1-800-462-8782
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Comments
piss poor training or QC how else do yo go breaking wires.
ok just blame it on some assembly worker who signs his paycheck with an X
Sounds like another pud recall
Two things that really concern me is ,
On my 2015 LTZ crew 3500 HD see 4×4 duramax
1 )is the very poor illumination of the headlights I can drive with my high beams on and nobody seems effected by it ,no one flashes their lights to tell me I’m blinding them.
2 )fuel pump is one of concern because they are prone to catastrophic failure
That being said I believe there should be a recall
I’ve complained about the poor headlight distance on my 2015 tahoe for years very poor low beams I drive on highbeams mostly to see far enough ahead to see dangers
Hello Randy,
Have you reached out to your local dealer about your concerns? I happen to work at a GM dealer here in Vermont and we have changed out the bulbs under a service bulletin number PIT5374.
Have a good day.
Does that apply to 18s also?
Hello Budlar,
I am not aware of this particular concern on the 18’s.
May I say that all TSB’s are posted where everyone can see them. When we are notified of a TSB at the dealership I can usually find it within a day or so posted online for EVERYONE who wishes to do a little research.
Have a good day.
Thanks you have a good day also
Bob ,no I haven’t but I will now that I know
That something can be done about it , and I thank you for the heads up
Bob , I think the best bulbs are HID especially in projection beam headlights
Randy,
You are most welcome for the tip.
I might say that what we are seeing here in the northeast is that HID have their own problems when it comes to driving in a snowstorm. If the temps are just right and the snow is heavy/wet the snow will build up on the front of the trucks effectively blocking the headlights. HID’s do not seem to produce enough heat to melt the snow. Having been in this business since the late 70’s I have seen many new technologies developed. Many I do not agree with. HID is one of them. If you search you will find another problem in 2016’s and up is with condensation within the lamp housing. There is a TSB for this as well. We see it every spring and fall with big temp swings. The only reason HID’s exist in my view is styling. Sealed beams controlled the design portion of the front ends of vehicles in the past.
Have a great evening.
I thought LED’s were cold and not suitable for projection beam headlights because of light scatter, HID is 50 amp and burn with an arc and they have start up ballasts I thought they would be hot but you seem to know what is best , I did put some sylvania bulbs in , they were about 60.00 bucks it helped only a little but I’ll contact Bosak Chevrolet in Chesterton Indiana on Monday and inquire about the TSB , thanks again
Is there a bigger diesel moter than the 6.6 in the works for the 3500HD pickups
Yes
No doubt the headlights suck and use cetane additive in the fuel to avoid the fuel pump issue.
I add Lucas upper cylinder lubricant to every fuel up and every 3,000 miles I add Amsoil fuel injector cleaner with cetane
lucas and amsoil make quality additives zmax also
I have found the best additives for my diesel fuel have been from John Deere and I have used them not only in tractors farm equipment but my diesel pickups and have never had a problem