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2022 Yukon Denali Headlights Flickering & DRL Issues

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James R. · rep 0 · May 22, 3:43 AM · 1 replies · solved · Question

Vehicle: 2022 GMC Yukon Denali

I'm having some weird electrical problems with the headlights on my 2022 GMC Yukon Denali. Both the main headlights and the daytime running lights (DRLs) have started flickering intermittently. It's not constant, but it happens enough to be noticeable and concerning, especially at night.

Sometimes, one DRL will just go out completely for a few minutes and then come back on. I've checked the connections I can see, but everything looks fine. Could this be a loose ground, a bad headlight module, or something with the BCM? It's a relatively new truck, so I'm surprised to be having these kinds of issues already.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:43 AM

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ClearTheCode admin answer:

Flickering headlights and DRL issues on a newer vehicle like your 2022 GMC Yukon Denali can be quite perplexing, as modern lighting systems are complex and often controlled by multiple modules.

Common Causes:

  1. Loose or Corroded Ground Connection: This is a very common cause of intermittent electrical issues. A poor ground can cause voltage fluctuations, leading to flickering.
  2. Faulty Headlight Assembly/LED Driver: Modern LED headlights often have integrated drivers or modules. If one of these components is failing, it can cause flickering or intermittent outages.
  3. Body Control Module (BCM) Issues: The BCM controls many electrical functions, including lighting. A software glitch or internal fault within the BCM could cause erratic headlight behavior.
  4. Wiring Harness Damage: While less likely on a newer vehicle, a pinched, chafed, or corroded wire in the headlight circuit could cause intermittent issues.
  5. Voltage Regulator/Alternator Issues: Although your primary concern is lighting, underlying voltage instability from the charging system could manifest as flickering lights. (Less likely if no other electrical issues are present).

Diagnostics & Next Steps:

  1. Visual Inspection: Carefully inspect the wiring harnesses leading to both headlight assemblies. Look for any signs of damage, corrosion, or loose connections. Check any accessible ground points related to the front lighting.
  2. Check for Technical Service Bulletins (TSBs): GMC may have issued TSBs for known lighting issues on your specific model year. A dealership can check this for you.
  3. Scan for Codes: Even without a check engine light, a professional scan tool can often pull 'B' (Body) codes from the BCM or other lighting modules that might indicate a fault.

When to See a Shop:

Given the complexity of modern vehicle electrical systems, especially with LED lighting and BCM integration, it's highly recommended to take your 2022 Yukon Denali to a GMC dealership or a specialized automotive electrical shop. They have the advanced diagnostic equipment to pinpoint the exact cause, whether it's a faulty headlight assembly, a wiring issue, or a BCM problem. Attempting to diagnose or repair these systems without proper tools can be challenging and potentially lead to further issues.

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