Major electrical problems

[1999 White C5 Coupe]

Thank you all for your input guys! I will try all these out and I will put my findings on here.

Any update?

 

[Horscotta]

Yes. So I tested the battery. It was reading 12.5 volts then I started it and it was ready 14.4? I believe. So the battery is fine. I’m taking it to a shop next week. So they can properly diagnose it. I was going to replace the throttle body unit but the only place I’ve found a good one is the dealership and it’s non refundable. It’s a $250 part so I’m gonna save that money and use it towards the diagnostic.

 

[Horscotta]

I also checked wire harnesses, alternator, alternator wires, and all that tested well and looked completely fine. I’m still only getting codes for the throttle/pedal sensor. (Low voltage)
P2122
P2127
The truck starts fine. Runs fine. I just have very weak pedal response.
I bought a whole new gas pedal from AutoZone, and when I installed it, my rpms shot up immediately and the error codes didn’t go away so I returned it and put back the original pedal.

 

[HDRam]

Did you put the original headlights back in?

 

[Horscotta]

No. I haven’t had original headlights in them in a while. I took out the LED’s and started it but I was still getting the same error codes and engine light/ electrical light

 

[Daw14]

horses and water

 

[Horscotta]

Update:
Trucks now at the dealer. They swapped out the whole gas pedal and the issue is still there. They are further diagnosing the problem

 

[Horscotta]

I now need a powertrain control module. Item from the dealership is on super back order. They don’t even know an ETA of when it will be available. Anyone know where I can get a trustworthy one? Aka not eBay.

 

[Mister Luck]

I now need a powertrain control module. Item from the dealership is on super back order. They don’t even know an ETA of when it will be available. Anyone know where I can get a trustworthy one? Aka not eBay.

A closing fix on this ?

 

[Horscotta]

@Mister Luck
No. I’m still having problems. I’m going to swap about headlight bulbs and turn signal bulbs that I swapped for LED’s. I’ll comment back when I get my findings.

Im still getting a bunch of codes but the truck itself is running completely fine.

 

[Mister Luck]

@Mister Luck
No. I’m still having problems. I’m going to swap about headlight bulbs and turn signal bulbs that I swapped for LED’s. I’ll comment back when I get my findings.

Im still getting a bunch of codes but the truck itself is running completely fine.

Like Custom Parts? Get ready for Custom Problems!

Customer installed aftermarket LED headlight and fog lamp bulbs. Now body modules are shutting down.

m.youtube.com

 

[Horscotta]

I just put in the new LED’s (with a higher wattage output ) and all codes went away. We’ll see if that actually fixed the problem when I drive to work tomorrow!

 

[Horscotta]

So far so good with higher wattage headlights!

 

[indept]

So far so good with higher wattage headlights!

It might not be the higher wattage that fixed it. Some of the cheaper LED headlights put high frequency noise on the DC line which could cause false codes. Better quality LEDs have better "filters" on their driver circuits. Years ago I had a Grand Cherokee WJ that I bought cheap ones for and it put a lot of noise on the radio. Bought better LEDs and problem solved.
You get what you paid for.

 

[Horscotta]

Lesson learned! It did cause my pcm to fail though, and my throttle position sensor. Unless it was just a coincidence but yeah. Damn cheap bulbs caused all these issues! Thanks to everyone who chimed in! Appreciate your help