2.8L Duramax Customer is Upset - P20E8 Diag and Repair

Customer states service exhaust fluid system message. He went to another shop first, they diagnosed the fault as being a faulty DPF diesel particulate filter which I had just replaced for a code P2002 13,000 miles ago.
Diagnostics leads to P20E8 code and reductant DEF fluid pump replacement.
Chevy Colorado GMC Canyon
#mechanic #cars #professional #tipsandtricks #engine #automotive #knowledge #diesel

[@davebullock3517]

Great video! It’s a shame no one was smart enough to put a drain into the DEF tank.

[@DadsGarageDiagnosticSpecialist]

Thank you!

[@davebullock3517]

@@DadsGarageDiagnosticSpecialist, what’s your opinion on these 2.8L Duramax engines? I’m looking at a 2016, with 120,000 miles, I know it’s close to timing belt change.

[@DadsGarageDiagnosticSpecialist]

@@davebullock3517 the 2.8 L seems to hold up well. I’ve only seen minor problems with oil leaks or coolant leaks at the back of the cylinder head. The majority of the problems that I see with them are the DEF system and DPF system. If I were going to buy a 2016 and I was going to choose between the 2.8 L diesel with 6 speed transmission vs a 3.6 L gas with 8 speed transmission I would choose the 3.6 L gas engine simply for the lower cost of ownership maintenance and repair wise. When you’re driving the 2.8L has good low RPM torque, I think the gas V6 also has low end torque and is more fun to drive when you want to put the pedal down…. The gas engine also has better engine braking. Thanks.

[@davebullock3517]

@@DadsGarageDiagnosticSpecialist, emission system issue, sort of saw that coming. 😂 Thanks for your reply.

[@agoodneighborautorepair2176]

Very good information and explanation

[@DadsGarageDiagnosticSpecialist]

Thanks

[@golf25radioman]

I'm a new visitor to your channel. I don't have a diesel vehicle, but found your video interesting. Your diagnosis and repair was easy to follow, and educational. I was a GM mechanic, a very long time ago. Maybe that's why I find videos like yours interesting. Even though I'm never again going to work on them, I do find it fascinating to watch what it takes to nowadays. Thanks

[@DadsGarageDiagnosticSpecialist]

Thank you very much! Love the feedback.

[@ValleyCityPaintball]

Around 19:00 What fixed the new pump pressure from 1.7psi to 72psi? Also, does that metal piece at the end of the video stay in for install? Great video!

[@DadsGarageDiagnosticSpecialist]

Somebody came and talked to me while I was recording that part. There wasn’t anything wrong it was just the system doing a purge cycle. I mentioned that the injector was being pulsed on and off before building pressure, so all I did was wait another minute or so and it built the pressure and worked fine. And yes the little metal piece should come with the new pump and it’s supposed to be inside the fitting and stay inside. Thanks.

[@rotaryenginepete]

you can always siphon the DEF out prior to opening :)

[@DadsGarageDiagnosticSpecialist]

I might try that on the next one. These things are not designed to be friendly to the person working on them unfortunately. Thanks.

[@Bill6mo]

What’s name of that tool used to remove ring

[@DadsGarageDiagnosticSpecialist]

J-45722 Fuel Sender Lock Ring Wrench Thanks.

[@ronmalyk]

what part number of pump needs to just be replaced? from the bulletin. I've got a 2016 2.8 canyon any chance you could send me that bulletin? thanks for the video

[@DadsGarageDiagnosticSpecialist]

Part number has been updated multiple times so your best chance is to call the dealer. Thanks.

[@ronaldnielson8591]

Nice presentation. What software were you using?

[@DadsGarageDiagnosticSpecialist]

Thank you. I was using factory GDS2 scan tool hardware and software.

[@michaelslattery2121]

Not gonna mention the leak?

[@DadsGarageDiagnosticSpecialist]

@@michaelslattery2121 what leak?

[@michaelslattery2121]

​@@DadsGarageDiagnosticSpecialistat 6:00 when you remove the cover above the spare, there is a clear and steady drip.

[@DadsGarageDiagnosticSpecialist]

@@michaelslattery2121 I had the exhaust fluid hose disconnected at that point so the drip was coming from the pump about to be removed. Thanks.

[@gpretired2846]

where can i get that tool for the DEF pump ring?

[@DadsGarageDiagnosticSpecialist]

Try searching for J-45722 Fuel Sender Lock Ring Wrench. Should be available somewhere online…. Definitely not possible without the tool. Thanks.

[@DomManInT1]

Best way to lube a seal is with fish oil.

[@DadsGarageDiagnosticSpecialist]

Thanks for sharing the tip.

[@DomManInT1]

@@DadsGarageDiagnosticSpecialist Dad jokes for the win!

[@daveshepherd4342]

I sea what you did there

[@zackdiaz1388]

Has anyone got a code P2047 or P10D1? Truck was left out for a day and night didn’t know the temperature was going to drop to 10 degrees and below.

[@DadsGarageDiagnosticSpecialist]

I have replaced an exhaust fluid injector before for a P2047 due to incorrect resistance values. Also there is an ECM programming update to solve P10D1 so I would do that first. Thanks.

[@vepo2341]

@DadsGarageDiagnosticSpecialist Hi! Did you ever worked on diesel Duramax with code P026D? If yes, do you know what was the issue? If not, thank you anyway for taking the time to answer my question!

[@DadsGarageDiagnosticSpecialist]

P026D can have many causes. Replace the fuel filter and check for metal contamination. Thanks.

[@vepo2341]

@@DadsGarageDiagnosticSpecialist Will do, even though the filter has 91% to go, but I will try it. Thank you! Anything else I should check as well?

[@DadsGarageDiagnosticSpecialist]

@vepo2341 P026D usually means there is too much fuel flowing through the fuel injectors for some reason. Most likely wear or contamination… there might be an ECM reprogramming that can be done to reduce the frequency of P026D, but the first thing I would do is take a fuel sample and check for metal contamination. Erase the code and it will likely not come back for a long time.

[@vepo2341]

@@DadsGarageDiagnosticSpecialist Hi! Thank you for all the pointers, you gave me! I caved in and set appt with local Chevy. Just called them and they informed me, that one of the NOx sensors were bad. They did not specified which one, but I will ask tomorrow when I will go pickup the truck. They also let me know, it was covered under powertrain warranty :-o which makes me really happy!

[@DadsGarageDiagnosticSpecialist]

@@vepo2341 I have been seeing NOx sensor number 2 failures most often. Thanks.

[@danielb-c9100]

H

[@DadsGarageDiagnosticSpecialist]

Hello again. Thanks.