2024 Silverado ZR2 2500 6.6L gas engine failure

[UWSkier]

11 hours ago, Eric.V said:

The idler arm and the pitman arm were replaced due to excessive wear. The steering feels like new and the steering wheel is finally straight!!! 

I wonder if mine is shot too.  If my truck is parked and the steering column is unlocked, I can move the wheel several degrees back and forth without any resistance.  All the precision of a 1978 Mack Truck in this ancient setup.

[Eric.V]

57 minutes ago, UWSkier said:

I wonder if mine is shot too.  If my truck is parked and the steering column is unlocked, I can move the wheel several degrees back and forth without any resistance.  All the precision of a 1978 Mack Truck in this ancient setup.

Definitely have it checked ! My dad's 24 AT4 HD is having similar chatter/vibration at very low speed turns in slippery surfaces. He's going to have his checked.  

[lundimpact1775]

On 1/3/2025 at 9:59 AM, Erik W said:

Just wanted to say thanks for posting this.  My 2024 gmc 3500 has been in the shop for nearly a month and they still cant figure out what’s wrong with it.  My truck just died, it starts back up and runs like crap again.  It has 9 different codes and if the dealer gets them cleared they come back on again.  My dealer communicates well and has told me that they have had request for support from GMC for weeks but hasn’t gotten a response yet. 

 

 

When my hpfp popped it exhibited the same symptoms. Died, started again extremely rough, every dash light was on and multiple codes. Observing the codes the two that stood out to me were both related to fuel system pressure. I noted this and discussed with the shop that I had it towed to. They confirmed my roadside diagnosis was correct- hpfp failure.

 

The fun really got extra fun when it happened again 3 days after it was replaced. Electrical failure the 2nd time due to faulty part from GM, as opposed to the original catastrophic mechanical failure. 

 

Anyway, something to consider. Take all those codes and see if 2-3 of them are related to fuel system pressure. 

[Pryme]

On 5/27/2025 at 9:17 PM, lundimpact1775 said:

 

 

When my hpfp popped it exhibited the same symptoms. Died, started again extremely rough, every dash light was on and multiple codes. Observing the codes the two that stood out to me were both related to fuel system pressure. I noted this and discussed with the shop that I had it towed to. They confirmed my roadside diagnosis was correct- hpfp failure.

 

The fun really got extra fun when it happened again 3 days after it was replaced. Electrical failure the 2nd time due to faulty part from GM, as opposed to the original catastrophic mechanical failure. 

 

Anyway, something to consider. Take all those codes and see if 2-3 of them are related to fuel system pressure. 

At how many miles did your hpfp go out? I wonder what the avg life is on it. The thing runs at like 2k psi. 

[lundimpact1775]

6 hours ago, Pryme said:

At how many miles did your hpfp go out? I wonder what the avg life is on it. The thing runs at like 2k psi. 

 

Popped at 92k miles. Better than the diesel flavor of this problem, but still cost me 3k in parts and labor. Took out the injectors with the forbidden glitter.