GM Duramax Diesel Fuel Pump Lawsuit Nears Settlement
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Back in May 2023, GM Authority reported that a lawsuit regarding Duramax fuel pumps had been filed against General Motors. With that in mind, it appears as though the Detroit-based automaker has reached a preliminary settlement.
According to a report from CarComplaints, the Duramax fuel pump lawsuit alleges that 2011 to 2016 Chevy Silverado HD and 2011 to 2016 GMC Sierra HD trucks equipped with the 6.6L V8 LML turbodiesel Duramax engine are dangerous to operate because the Bosch CP4 pumps can shut down the engine while driving.
It’s worth noting that General Motors denies all the allegations and denies the trucks are defective.
“Plaintiffs allege GM then charges consumers $10,000 to fix it, when it allegedly knows that ‘any such repair is futile because it will not actually fix the issue so long as the vehicle is being filled with U.S. diesel,'” the lawsuit reads.
Per the lawsuit, the Bosch CP4 fuel pumps fail from the use of American diesel fuel because the pumps are too fragile to manage U.S. diesel. As such, the plaintiffs claim that the pumps generate metal shavings which then destroy the fuel injection systems and eventually the Duramax engine as a whole.
In order to qualify for the settlement, owners must have purchased an affected pickup from a GM dealership after March 1st, 2010 in one of seven states, including California, Florida, Illinois, Iowa, New York, Pennsylvania or Texas.
Finally, reimbursements are available for owners who paid their own money for diesel fuel pump repairs. However, said repairs must’ve been for problems caused by fuel pump metal parts rubbing together, creating metal shavings, contaminating the Duramax fuel system, and causing catastrophic engine failure.
In addition, all current customers who own still affected pickups will receive prospective future warranty coverage for repairs performed at GM dealerships on the Bosch CP4 fuel pumps and related components. That being said, the future warranty will be limited, meaning that owners will still pay for 50 percent of the repair.
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Makes me want to buy the gasser.
This article makes it seem like only the original buyer can get this relief. Is that the case?
Why isn’t other states involved with this lawsuit? There is more trucks that have trouble with this issue.
Appears GM is willing to help some owners in partial fashion provided they live in the right state.
Makes me continue to wonder why I have owned GM vehicles since 1967, and currently own 3.
Dave’s Auto Center in Utah, a very respected YTube mechanic, offers CP3 pumps to replace the CP4. When, not if, the CP4 goes, it does indeed trash the entire fuel system, injectors and all, with metal shavings. Replacing it with the much more reliable CP3 eliminates GM’s “cost savings” (to them) and gives you a better pump that will not trash the fuel system if it fails. If I had a more current GM diesel with the CP4, I’d be making an appointment to spend 3-4 days in Utah (the replacement takes 2 days).
Water and fuel contaminants , change all your filters often ! power stroke uses the same pumps. Green new deal ! Ultra low sulfur fuels. Use a good additive in your fuel. Pay now or pay later.
I watch Dave and Miles all the time.
I’ll take my gas 6.6 all day. Good luck.
After a great experience with a 7.3L PowerStroke in a 2001 Ford, I’ve had horrible experiences with a 6.0 Ford and a 6.6 Duramax. I’ve since sworn off light duty diesels and am living with the minor shortcomings of a gas engine in favor of lower operating costs and zero problems. Whether it’s the low sulfur fuel or the enormous power these engines are generating, for me, the juice ain’t worth the squeeze.
Ulsd diesel us formula. You have to add diesel supplements to lubricate hpfp and other fi components. Blame it on us gvmt and refinery’s. Do not blame gm or bosch.
As much as you paid for your truck you can afford supplements. Or buy European fuel. Do your research . I use stanadyne performance formula an am approaching 130 k mi. Vw NCAA diesel with cp4.
Very nice that you have found the saving grace for your Truck.
But unless GM stated that you can’t use US diesel in your US Built, and US sold truck GM is not in the clear here.
Did anyone tell you, or is it in the manual that you can not use US fuel in your truck?
And before you ask, no I do not own a GM Diesel, my Denali, and High Country have both been 6.2 Gas motors.
And my comments are based on 6 years of bad experience with GM’s 8 speed transmission, another black stain on GM.
I concur @geo-3. Any decent validation plan would have included testing a new fuel pump using fuel possibly from every market that it would be sold into. If they new the US fuel contained fewer lubricants, then it should have been a high priority to use for endurance testing. I find it hard to believe that GM “missed” failures on a test bench when there is a 7% failure rate in the US. I’d put money on they had failures, threw a “fix” at it, and didn’t properly validate the fix due to production time constraints.
Hey Chuck! Do more research and don’t buy light duty diesels period.
It just happened to my 2016 gmc denali about 2 months ago. It suddenly died and it was the cp4 fuel pump. I had to pay close to $15k to switch Ober to cp3. I need to get my money back from gm asap.
Ive personally done a few of these ! Its not metal shavings its more like bronze glitter ! First warning sign is a wornky fuel gauge ! This is the glitter accumulating on the fuel level sender ! This is when you want to shut it down to save the injectors ! Everything else after pump replacement basically just needs to be cleaned !
yes blame it on gm and bosch not the oil companies the trucks are made for here not Europe
I just replaced my pump in my 2012 Duramax,it didn’t go bad ,I just replaced it for peace of mind,I didn’t want to get stranded in the middle of BFE.it cost me $4000 dollars.
It’s no a fuel issue it a fuel delivery issue. Without the proper fuel delivery to the cp4 it will eat it’s self because it’s getting to hot trying to suck and pull fuel. It’s a lift pump issue. Dodge knew this that’s why they did a recall on all 19-20 trucks with co4s the flash tune truck and put cp3s back on them. Because dodge can’t make a lift pump to save there lives. But there is several cases were people have a 19 or 20 with a cp4 no problem but they installed a airdog or fass and still running strong today. So it is a gm issue. Our Ford work truck has a cp4 it had 98k miles with no issues then all of a sudden it blew up come to find out the cp4 ate it self and ruined the hole fuel system guess what was out and not working anymore yup lift pump. Ford wants $35k to replace everything is a 2015 f350 c&c. Now we have a 2024 f350 c&c.
I’m a second generation Chevy owner, 1st was a New Vega (was a gift), 1998 Suburban, 2004 Suburban. Now looking at 2025 ZR2 Bison. But now, I see all the complaints about the 8 speed trannys with a couple of alleged fixes that do not resolve the complaints. Then problems with dents from force of water from car washes. Chevy’s recommendation, wash it by hand (sounds a lot like, just lump it). No 360 view and through the trailer view like the Silverado has. Low towing capacity, only two person trailer/campers. So not very family friendly. Feels like I’m being pushed toward Toyoya.
Dodgy mechanics using the wrong fluids destroy the 8 speed box there tried and tested at GM the problem fraudulent people destroying a good product it’s a ford biast run world be careful who you get to service your car that’s the truth
Sure. Buy a Toyota with the garbage TT V6 currently on a huge recall for engine failure. Great choice 🤣.
8spd’s are definitely not as robust as the 10spd, but are not as problematic as made out to be. Well over 180k on my close friends 2021 GMC SLE 5.3 with 8 spd and zero issues.
GM build amazing cars there let down by the components they order there parts from GM should Sue bosch
For sell faulty products with ford trucks you get a throw away sump and a plastic oil pump driven by a laky band GM are a way better company than the rest they make alot more cars
Actually the manual warns against use of any additive. Most of that snake oil carries the risk of helping water get past the separator/filter to where it can cause real damage. Likewise, many supposed lubricants have the potential to foul sensitive emissions equipment. I say blame EPA for strangling our diesels via restrictive emission standards AND blame gm for failing to equip a pump robust enough to survive our new “dry” fuel and it’s lack of lubricity.
What about all the other states? I’m in New Jersey and this is the exact problem I had with my diesel truck.
I just replaced my pump in my 2012 Duramax,it didn’t go bad ,I just replaced it for peace of mind,I didn’t want to get stranded in the middle of BFE.it cost me $4000 dollars.
Surprised anyone still has a cp4 running in their trucks.
How do you go about to put claim?
A year ago I replaced the dangerous CP4 with a Fleece CP3 conversion. The CP4 did not blow up but I did it for peace of mind. Shame on GM for not owning up their mistake. And as it stands now you have to be in the right state and had to pay for a repair out of your pocket. That still sucks as we spent good hard earned money for these trucks in all states and were not told about the low sulfur fuel problem when buying. GM should own up to it like Ram did. The least they could do is issue every owner with a CP4 pump a check for $3000.00. And not a credit towards a new vehicle.
The last paragraph says all current customers. So I assume that means everyone who owns them. Might be wrong.