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Stalling/RPM's surging, codes B0090, U1096 and U1041

Tiny
DUSTIN.ALEXANDER
  • MEMBER
  • 2002 GMC SONOMA
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 224,000 MILES
My truck is stalling and surging when put into gear I hit the gas and it will stall out but idles fine for the most part has little surges when in idle. Then if it doesn't stall the rpm's will shoot back up and jerk the truck forward then rpm's will surge again. I did some research online I'm thinking it is the TPS, these codes came up on my code reader : SRS B0090 active switch short to battery/ground that came up twice, U1041 loss of ECBM communication, and U1096 lost communication with instrument cluster. Thanks for your time and I hope you can figure it out from my description.
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Thursday, May 2nd, 2019 AT 7:39 AM

3 Replies

Tiny
HARRY P
  • MECHANIC
  • 2,291 POSTS
Hello and welcome to 2CarPros. Having owned a few S series trucks, I can tell you that it's probably the fuel pump, especially if it hasn't been replaced yet. If it hasn't been replaced, you've been on borrowed time since about 160,000 miles. The pump has enough to start the truck, then it loses pressure and can't do much more than idle it. What you need to do is go to the local auto parts place with a loan-a-tool program and borrow their fuel pressure test gauge. Under the hood, on the right (driver's side) towards the close to the firewall and nearer the top of the engine, is a valve on the fuel line. That's where you hook your gauge up. Turn the key on and see what it says. Now start the truck and observe the readings. If it's getting down under about 45 psi while idling, you'll have problems. Start there and we'll go from there.

Here's a general how-to guide on checking fuel pressure: https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

I've attached a picture showing you where the test valve should be.
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Thursday, May 2nd, 2019 AT 12:08 PM
Tiny
DUSTIN.ALEXANDER
  • MEMBER
  • 2 POSTS
The previous owner did replace the fuel pump. He only drove it no more then 10,000 kms in four months of owning it. I've owned it for about the same time and only putting about 6,000 kms on it so the new fuel pump should still be in good condition, I am still going to do what you said and test the fuel pressure I will let you know how I make out! Thanks for the help.
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Thursday, May 2nd, 2019 AT 12:29 PM
Tiny
HARRY P
  • MECHANIC
  • 2,291 POSTS
Yup no problem. I will say that the aftermarket pumps are junk. On my Blazer, I put one in and it almost lasted a year. The next one lasted six months. The next one lasted two weeks. The third one is still going after seven months, although I haven't driven it in two months.
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Friday, May 3rd, 2019 AT 5:44 AM

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