lundimpact1775

I would think evacuating fluid from that port is good, I definitely wouldn't drive it without refilling (I assume you mean you'd refill it first but just adding that). Once we add the dipstick can we just follow the markings on that as was done prior to the dipstick being eliminated in 2020? That's the question I'd like to have an answer to myself.

My hpfp blew at 91k miles, and the replacement hpfp failed on the electronic side at 92k. It certainly hurts in the confidence department, but now I'm still driving it and it's working, so far so good.

64, yes, it was the replacement pump. The pump itself did not fail but the electronic side of it, the regulator I'm told, decided to stop functioning, resulting in lost power to one Bank of cylinders. At least no injectors had to be re-done this time. Replaced hpfp again with GM part, have truck back, so far 150 miles no issue. Once again taking it on a road trip tomorrow, making sure I have my AAA account setup today. Plan for the worst hope for the best.

55 mph** not mpg

Well here's an update for anyone interested, picked up truck Thursday, 40 miles home. Drove it into town to gas up Friday morning, then headed out Saturday morning for a 250 mile road trip with a truck full of people. Stopped for lunch at mile 200, ate, hit the road. 55mpg cruising, same exact failure. Towed back to the shop that fixed it (luckily, passenger had AAA with 200 miles range). They offered a free loaner which I declined as I have a car too. They dissected it first thing Monday morning and said the new hpfp they installed had an internal fault in the regulator, causing it to misbehave. Another new hpfp in and picking up again tomorrow. I've lost so much confidence in my "road trip" rig at this point... Idk what to even do though besides keep driving it since this work is all under full warranty for 2 yrs/ 24k miles. My only solace at this point is the shop in question has committed to ensuring it stays on the road under their warranty.

Having a known reputable shop take care of it. Sure isn't cheap but I trust their work and how thorough they are.

I suppose that makes sense, hadn't considered it that way. We are replacing all 8 injectors anyway, and plugs since it's coming due soon. Should be all taken care of this week. I hate paying shop prices... But at this stage in my life I guess I can afford it and I probably would not have caught the failed injectors until after it was all back together. I did guesstimate the hpfp correctly anyway so that was worth a grin.

92k and some change on the clock. Bought it at 89k from a known reputable dealer. Needed something reliable with a crew cab and the normal size box, and did not want to break the bank. Hence buying a pre-owned unit with higher miles. My favorite and most reliable truck I ever owned was my 2010 1500 with 6.2 I bought it with 120k on the clock in 2013 which is very high for its age. Drove it until 2019 and 265k miles without a single hiccup.

Multiple stuck injectors and a failed high pressure fuel pump is the final verdict. I'm just astonished that those things could all fail spectacularly at once. Would have guessed one or the other.

Hi everyone. Heading home last Thursday from running some errands my 2020 L8T went into limp mode and then died while cruising 70mph. As I waited for a flatbed I attempted some starts, which resulted in crank crank Frank no start. Codes showing immediately at limp mode were p0089, p0304 and p228c. I'm hoping it's "just" the hpfp, but any input is appreciated and welcome. This is based on the p0089 and p228c faults, combined with the no start condition but I'm only guesstimating here. Current shop status is that every light on the dash is now lit up and they were able to start it but it misfired badly. Hope to have a final diagnosis later today.

Oh interesting, been a few years since I've had a power steering pump, I hadn't considered that. Thank you. I was going to say it's a sorry excuse for a trans cooler if that's what it is!

Forgot to add the picture

Hello, I've got a 2020 L8T and I'm trying to identify a part of the cooling system. Can anyone tell me what this pipe is? I have an external trans cooler rpo code listed on the build sheet (purchased truck used). I have a pipe in front of the radiator that is "finned" almost like a single row radiator. Looks like a trans fluid line in, through the "finned" section, curves back as a regular non-finned pipe and back to the condenser. Is this what they're calling an external trans cooler? Just a single section of finned pipe? By finned I mean it looks like a caterpillar, I guess would be the best way to describe it. Looked up the part number that is printed on the line going into it and it says trans oil cooler line, so I'm almost positive that's what it is. Can anyone verify?