P2150 and P0302 after getting gas

67firebird455 · December 28, 2022

Wife drove across town (in the rain) in our 2015 Yukon XL Denali and after getting gas, made it about 1/4 mile, stopped at a light, then began to feel a vibration, and check engine light started flashing. She made it home, I scanned it and came up with the above codes.

I fired it up, cleared the codes, then the miss started again. We've got just under 120k on this thing. Are we thinking injector #2? Appreciate any insight!

rav3 · December 28, 2022

What are the Possible Causes of the Code P2150 Chevrolet?

Faulty Fuel Injector 2
Fuel Injector 2 harness is open or shorted
Fuel Injector 2 circuit poor electrical connection
Faulty Engine Control Module (ECM)

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. The ECM energizes each fuel injector by grounding the low control circuit of the fuel injector. The ECM monitors the status of the fuel injector circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel injector high voltage supply circuit is shorted to ground for greater than 2 s.

steelerdude15 · December 28, 2022

This may not solve the issue, but have you run any fuel system cleaners through the system? There could be sediment built up on the injectors. I’d try that first to see if it fixes the issue.

67firebird455 · December 28, 2022

Thanks @steelerdude15 and @rav3 for taking the time to respond. I drove it over to a friend's to hook up to his scanner, and although the check engine light was on, it was fine until it got to temp, then a dead hole, flashing check engine light, and traction control light. Cylinder 2 misfires were incrementing, so sounds electrical. Going to pull the intake and try and locate some injectors tomorrow, inspecting the injector harnesses while it's apart, and cleaning the intake while it's off.

I reminded the wife we should've pulled the trigger on that 02 SS camaro I found for my soon-to-be-licensed son. We could've had a backup car other than my 67 in this rain!

Thanks again guys.

67firebird455 · December 29, 2022

Tonight, we removed the intake, fuel lines, one rail and set of injectors. I ordered new OEM injectors, fuel rails, high pressure fuel line, and injector harnesses since I'd rather not open this thing up again if I can avoid it. Since this is a 2015, there are no small boots and the end of the damn injectors were nearly seized to the head, so I ordered two seal kits from GM also. PB blaster certainly helps to loosen things up, but this job is miserable, especially when it's the wife's car.

Stonewood · December 29, 2022

Keep us posted after the repair is complete. I'm certain you're not the only one to perform this type of maintenance on their GM engine.

movario · December 30, 2022

Keep in mind that you need a special tool for the PTFE seals of the injectors.

And pay attention to not bend the fuel line, even with the special tools it was a hard task to get this rail off.

newdude · December 30, 2022

55 minutes ago, movario said:

Keep in mind that you need a special tool for the PTFE seals of the injectors.

And pay attention to not bend the fuel line, even with the special tools it was a hard task to get this rail off.

If OP is getting new injectors, the seals are already installed on them.

67firebird455 · January 5, 2023

Well, we got the injectors swapped with new rails, high pressure lines, both injection harnesses, and intake gaskets... No more misfires, but, the dreaded P219A and P219B now. Seems to drive fine, but after a couple of drive cycles, both DTCs pop up.

Edited January 5, 2023 by 67firebird455

67firebird455 · January 5, 2023

https://photos.app.goo.gl/JzSSGkQApDTGk6FW9

That purge valve seems awwwwfulllll loose. Everything upstream looks good except that. I've got a sneaky suspicion the wrong bolt is in that valve. Going to replace it and give it a shot.

67firebird455 · January 5, 2023

Got a new purge valve (it came with a bolt), inspected the end of the hose, and reset codes. Now after two drive cycles I've got P219B. I may need to bust out HP Tuners and reset fuel trims after all the nonsense.

Stonewood · January 7, 2023

Why does everything have to be so troublesome?

67firebird455 · January 7, 2023

HAHAHA that's what I'm saying. Reset fuel trims, still get random P219A and/or P219B. Injector balancing is off, so I can nearly guarantee you these are fake GM injectors (they look and feel legit). Ordered rail removal tools, and 8 genuine GM injectors from rockauto along with another set of replacement fuel lines. We'll give it another go next week I guess.

KARNUT · January 7, 2023

I’ve been kinda following this thread. The thing that keeps popping into my head is did anyone check for bad gas. After all one the first sentences was. After my wife got gas. I’ve gotten bad gas and fuel before. The vehicles were old enough that I just dumped the fuel added cleaner. And it cleared up. I figured it was obvious enough that it was the first thing checked. I must have just missed it.

Edited January 7, 2023 by KARNUT

Stonewood · January 7, 2023

Continue to keep us updated. I applaud you for doing this work yourself. I wouldn't dare trying to do this type of work on my 2018. Naturally, things would snowball out of control for me. This is how things roll for me.