Transmission intermittent issue?

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Jul 8, 2022 | 06:55 AM

Spankstangs1999

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Transmission intermittent issue?

I have a 2005 Chevy Silverado 1500. I bought the truck with a freshly rebuilt bulldog transmission truck ran fine for a few thousand miles until I started pulling my boat. So early in the morning on the way to the boat ramp truck runs fine. Now leaving the boat ramp the truck starts in 3rd gear I believe and has no power it will slowly creep in rpm with pedal to floor until it shifts to 4th. It only does this from a dead stop. Truck has no trans codes. Just some rear o2 codes where do I start?

Jul 8, 2022 | 07:56 AM

bbond105

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From: Poplarville, MS

Start with the O2 codes. These codes could be throwing the trans into limp mode.

Last edited by bbond105; Jul 8, 2022 at 08:02 AM.

Jul 8, 2022 | 07:18 PM

Spankstangs1999

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Thanks, going to trouble shoot the o2 codes then go from there.

Jul 9, 2022 | 09:16 AM

mrvedit

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Starting in 3rd sounds like limp mode,, but then you get codes and it won't shift to 4th.
Any chance water got into e.g. the trans connector while unload/loading the boat?

Jul 9, 2022 | 10:34 AM

Spankstangs1999

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Rear tires never touch water. O2 codes are p0060 and p0161 it's bank 2 sensor 2. Going to look into it more today. From my understanding these o2s are on trans power.

Jul 11, 2022 | 04:46 PM

Spankstangs1999

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A rear o2 was bad, replaced that. Also the shift linkage was on incorrect, fixed that. I didn't realize but the shifter wouldn't go down to 1 it does now. Taking boat to river tonight which is half distance I usually travel to go offshore but should be a good test.

Jul 11, 2022 | 10:07 PM

Spankstangs1999

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Ok truck is doing same thing but now I'm getting both knock sensor low frequency codes again. I just replaced both sensors with ac Delco part and wire harness not long before I started towing. Ughhh. Am I able to just get them tuned out ? Or did I over tighten them my 1/2" torque wrench didn't go low enough.