Jump to content

Electrical/Headlight Issues After Delete

73556085455
 Share

Recommended Posts

73556085455 New Member

73556085455

Posted
Posted

Hey everyone, I’m having some weird electrical problems with my 2021 GMC 3500 Denali and hoping someone out there might have dealt with something like this before.

 

Background
I just had my truck deleted (DPF/EGR) recently. Everything ran fine at first, but right after the delete, I started getting a bunch of issues related to my headlights and turn signals.

 

What’s happening

  • My left turn signal blinks super fast and stays stuck on sometimes

  • My left headlight is mostly dead except for one small LED

  • When I turn on the left signal, my right headlight will blink

  • I’m also getting a “Service Charging System” warning

  • The shop that did the delete said it was due to a bit of condensation inside the left headlight and told me to replace the whole assembly

  • But I don’t buy that condensation was minimal, and the timing lines up exactly with the delete work

 

What I’ve done so far

  • Visual inspection of the headlight, no heavy moisture or obvious damage

  • Checked connections, nothing seemed loose or corroded

  • Haven’t replaced any fuses or swapped parts yet

 

I’m not super confident it’s a headlight failure, more likely something electrical got messed with during the delete. Has anyone else had similar issues? Any ideas on what to check next?

Another JR Senior Enthusiast

Another JR

Posted
Posted (edited)

I can’t imagine the delete itself done properly causing those lighting issues, but if they disconnected things to do the work they could have caused it by not getting everything reconnected the same way. Maybe ask if they can tell you what wiring they disturbed in doing the work. If they won’t tell you, try looking in the areas they would have worked. I would especially look for loose or disconnected grounds.  

Edited by Another JR
73556085455 New Member

73556085455

Posted
  • Author
Posted
1 hour ago, Another JR said:

I can’t imagine the delete itself done properly causing those lighting issues, but if they disconnected things to do the work they could have caused it by not getting everything reconnected the same way. Maybe ask if they can tell you what wiring they disturbed in doing the work. If they won’t tell you, try looking in the areas they would have worked. I would especially look for loose or disconnected grounds.  

I took it back the day after the delete when I noticed the issue and they basically told me to kick rocks and to buy a new headlight

newdude Senior Enthusiast

newdude

Posted
Posted
5 hours ago, 73556085455 said:

Hey everyone, I’m having some weird electrical problems with my 2021 GMC 3500 Denali and hoping someone out there might have dealt with something like this before.

 

Background
I just had my truck deleted (DPF/EGR) recently. Everything ran fine at first, but right after the delete, I started getting a bunch of issues related to my headlights and turn signals.

 

What’s happening

  • My left turn signal blinks super fast and stays stuck on sometimes

  • My left headlight is mostly dead except for one small LED

  • When I turn on the left signal, my right headlight will blink

  • I’m also getting a “Service Charging System” warning

  • The shop that did the delete said it was due to a bit of condensation inside the left headlight and told me to replace the whole assembly

  • But I don’t buy that condensation was minimal, and the timing lines up exactly with the delete work

 

What I’ve done so far

  • Visual inspection of the headlight, no heavy moisture or obvious damage

  • Checked connections, nothing seemed loose or corroded

  • Haven’t replaced any fuses or swapped parts yet

 

I’m not super confident it’s a headlight failure, more likely something electrical got messed with during the delete. Has anyone else had similar issues? Any ideas on what to check next?

 

 

Any codes?  Need something to scan all the modules.  

  • 3 weeks later...
silveradosid Senior Enthusiast

silveradosid

Posted
Posted

it is probably the light, our 2021 3500 denali started having problems with the left headlight. the module that control the headlight is mounted on the bottom of the light and had water in it. there no cracks, so i dont know how the water got in. the fix is to replace the headlight. i did find later that you can buy the module separate on ebay

  • 4 weeks later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • JohnRoy
      2020 Sierra 2500 windows rolling down

      By JohnRoy · Posted

      Hey thanks yall for the info. It apparently was the key fob - the "reserve" key fob works just fine. Yall were all over it. Great input! JRD
    • PunchT37
      Wow I'm in a pickle. (Broke down truck) and a story.

      By PunchT37 · Posted

      I just bought one of these.   https://www.topdon.us/collections/diagnostic-tools/products/artidiag-pro   Yeah, it`s got a cable. $250/year after 2 years. Do I want more? Yep. But, I`m not working any more and can`t afford a whirlpool in my tool box.
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Why don't I have a good scanner? I've always wanted one when I've needed one.   My latest reading says I don't need to do a relearn on the ckp sensor on a 1995 with OBD 1.5. The relearn is prescribed for the later-model 1995's which shipped with actual OBD II when GM completed the transition in prep for the 1996 MY. I need to confirm that. Did you know forums are disappearing? Knuckleheads on Facebook... it's not the same. It's just not.   So, scanners. Again, shooting myself in the foot for having eBayed my Snap On MT2500 "brick" with all the adapters. Not that I couldn't buy another but those are getting quite old, and mine wasn't new enough to work on 2000's vehicles.   Damn it (as I'm scanning my email between paragraphs here). Did you know there's a 2000 Jimmy 2-door on BaT that's ending this morning? It's local. I want it. 14k miles. Absolutely beautiful.   Back to scanners. MT2500's are old. Solus, now that could be a contender. There's a ~2008 Verus with a system error that's basically new in box for cheap. Hmm...I'm not sure about a scanner that runs an archaic version of windows (95 or CE, I can't tell).   I want the ability to reset and rotate TPMS, test individual modules, bleed ABS, electronic parking brake controls for servicing brakes, relearn procedures and other bidirectional controls.   Snap On does an MT2600. It's a new model as of last year, marketed as their "entry" scanner. Entry? Only where $1900 gets you through the doorway plus, I'm guessing, $1000/year if you wish to keep it current. So goes scan tools actually designed for production environments. Want decent products with excellent support, you pay for it.   Everyone is raving about Autels and TopDons and Foxconns and all these newer brands that are selling the $500 "prosumer" scanners for backyard hacks like me. They're tempting...honestly. Updates are cheaper, base prices are remarkably cheaper... And you get to deal with bugs and translation whoopsies and, well, just don't use it on anything expensive, OK? Having a dealer replace an ECU because it needs to be re-imaged after an adventure in scanning is no joke. But I think most people are getting by OK with these units.   eBay on a scratch-and-sniff pro-model oldie, a shiny new TopDon, or???   God dang it, I can't stop looking at this Jimmy. I'm ready! I'll Bring The TRailer! It's beautiful.
    • Texasdeere
      What have you done to your K2 today?

      By Texasdeere · Posted

      I removed the OE running boards.  It looked so much better.  I wish I took them off a long time ago.     I had to put something back on for my wife.  I wanted Westin Sure Grip Running Boards but they are very pricey, like $600 plus.  I was going to go with the Ionic 41's like I had on the 2019 Silverado but went with Westin Outlaw Drop Steps instead, about $200 cheaper.  They are sturdy and functional but not super crazy about the look, but it works.  
    • Atlas
      Gas Prices

      By Atlas · Posted

      It's all a crock of 💩

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...