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P2135 code with 0300 0500 0600

SJ75

By SJ75
in 2000-2014 Silverado HD & Sierra HD

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SJ75 Enthusiast

SJ75

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2003 GMC sierra 2500HD 11 months ago on a very 8 degree cold morning I started out and it felt like it was under powered. Though it was cold, but shut down with the reduced power and check engine light. Would not restart. The throttle body was replaced. It still idled rough. I was told run fuel line cleaner through it a couple times and give it time to relearn. No other issues were present, but it did not work. back in late October another frigid cold snap hit. Did the exact same thing as soon as it got up to operating temp. Only this time it refired, engine had gotten warm before it went into reduced power. By mid morning even the check engine light went out. It was back to normal until christmas week. Another cold snap. I let it warm up before moving as usual. This time instead of the under powered feel, it felt like it was running over a wash board, then reduced power. It restarted And the check engine light did go out. Only this time at road speed it would occasionally run rough. As the day went on, that periodic rough miss fire got worse. The last turn onto the street home, it felt like i was in wrong gear of a standard shift 4 cyclinder engine and about to stall. It didnt but almost. I got in the drive and had codes P2135, 0300, 0500, and 0600 appear. Checked the wires, checked plugs, ground wires, connections, replaced the accelorator. but it still idles rough telling me it is still not fixed. Dealer just wants to change the throttle body. Already done earlier. I am going to clean the mass air sensor. I dont want to take it places and have them replace parts for two or three times what I can only for it to not be fixed. I did my best at detailing the issue. Where should I look for possible problems from here? thank you

Swimmer8366 Enthusiast

Swimmer8366

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Might help. Pigtails may be a problem probe them and see what voltage your at should be around same at pedal and than at throttle body sensor best of luck to ya if all good tthere I would check wires going to module or grounds

 

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SJ75 Enthusiast

SJ75

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Thank you for the replies. I have found that this being an early 2003 model, the iring isn't all that great. Would it be better to just replace the entire harness, then redue the test?

SJ75 Enthusiast

SJ75

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I did the tug test. seams the wires are not broke. Doesnt mean that a few strands are broke or broke somewhere else in the line.

  • 2 weeks later...

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