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P2127 Code Engine Power Reduced with Pedal Commander


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I hit the P2127 twice in the past week on my Sierra. GMC Service diagnosed it to a low voltage issue with the pedal assembly and replaced it. I have had the Pedal Commander since December and I don't think this would have caused issue with the pedal assembly. I tried the re-seating of the Pedal Commander before taking it in but it just returned with the same error code. Of course I removed the Pedal commander once I hit this issue the second time and before I took it into service. Has anyone hit an issue with the Pedal commander causing the pedal assembly to fail?

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Yes this is common. Pedal commander is junk. Sorry but you just can't cause that signal as they claim and not have a issue. There are ways to trick it to work but if the pcm ever relearns throttle position. It freaks out again. Onlybwhay to sonit right is tune. Then I can just adjust you torque management tables leave you adaptive and change you pe so you have 100% throttle at any rpm. It takes 5 to 10 minutes to do this but it stay in truck.

Sent from my SM-N960U using Tapatalk

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I just was in the service dept for 2 days. I have a 2018 Sierra SLT, 10,000. miles. I have had power steering go out 3 times and this last one was the engine went into protect mode. On-star report came back and said I lost stabile track and power brakes. It stayed like that for 24 hrs. This last time they removed the Pedal Commander and cleared codes. I have to say I'm getting pretty close to looking into a Lemon Law issue. I love my truck but this is ridiculous, could all this be because of that pedal box?   

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Easy solution. Take that pedal commander off and see if the problems continue. If the trouble continues make it's out before going to the dealer. Save yourself and the tech a lot of trouble.

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  • 3 months later...

I been running PC for about a year and recently it's been throwing the code and goes into limp mode. What's scarry about that is you loose throttle, no matter how hard you press it, nothing happens. I had to pull over, shut off the truck and clear code, then it's fine. 

 

I love the thing but can't have it throw codes every other day. I had been running the truck without it for few days now and throttle seems soooo slow. I gotten used to the PC feeling lol

 

I'm going to see if they have a software update available for it. 

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