GENERAL MOTORS 2014-2015 GMC SIERRA, GMC SIERRA 1500: SOME VEHICLES ARE EXPERIENCING POOR HEADLIGHT PERFORMANCE WHEN DRIVING IN RURAL DARK AREAS. UPDATED 1/22/16.
full bulletin at NHTSA ↗2015 GMC Sierra lighting problems
moderate 112 complaints filed with NHTSA · avg repair $250 · see lighting across all vehicles →
Failure mileage
Complaints
112
Recalls
0
Avg fix
$250
When does it fail?
Of the 112 lighting complaints filed for the 2015 GMC Sierra, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 112 lighting complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Among the 11 model years of GMC Sierra in our records for lighting problems, this one ranks #2 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering lighting on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
GMC/CHEVROLET: THE HEADLIGHTS ON SOME SNOW PLOW EQUIPMENT BECOMES INOPERATIVE AFTER SWITCHING FROM FACTORY TO SNOW PLOW USAGE. MODEL 2014 SILVERADO 1500, 2014 SILVERADO, 2014 SIERRA 1500, 2015 SIERRA.
full bulletin at NHTSA ↗GENERAL MOTORS 2014-2015 GMC SIERRA, GMC SIERRA 1500: INFORMATION REGARDING POOR HEADLIGHT PERFORMANCE WHEN DRIVING IN VERY DARK RURAL AREAS.
full bulletin at NHTSA ↗This Preliminary Information communication provides information to the technician about vehicles that have installed an aftermarket bed cap or topper may question where they can wire in the center high mounted stop light for the cap or topper. Provisions for the center high mounted stop light have been provided at the Rear Body Junction Block (X63A) connector X6 terminal 1.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of 2015 GMC Sierras consistently describe projector-style headlights as dangerously inadequate for night driving. Low-beam visibility is limited to 30–50 feet, with a narrow, focused pattern and almost no spillage to the sides of the road. High beams illuminate treetops and signs instead of the road surface. The single-bulb design (one halogen filament serving both low and high) creates an impossible trade-off: aim for safe low-beam distance and high beams point skyward; adjust for road-level high beams and low beams become unusable.
Lateral illumination is nearly absent—owners cannot see road edges, curves, or side hazards without fog lights. Rain and wet conditions render the lights nearly invisible. Owners report nearly hitting wildlife, pedestrians, and obstacles; some pulled off roads multiple times. GM issued Technical Service Bulletin #PIT5374 (bulb upgrade and BCM voltage increase) that dealers cite as the fix, but owners report marginal improvement only—many still call the truck unsafe to drive at night. The manufacturer redesigned the headlights starting in 2016 with HID lights, tacitly confirming awareness of the defect. Aftermarket LED or HID replacements ($300–$1,000) are widely reported to work well. A separate third-brake-light gasket failure has been documented, allowing water into the cabin and causing mold and interior damage; repairs cost thousands, with GM offering limited assistance to out-of-warranty owners.
Same GMC Sierra lighting reports on nearby years: 2014
Failure modes owners describe
Inadequate low beam illumination
Projector-style headlights fail to deliver sufficient light output on low beam, limiting visibility to 30–50 feet or less. Owners report dim, narrow beam patterns with poor lateral coverage and inability to see road edges, side hazards, or far enough ahead for safe braking. Problem persists across rural roads, dark areas, and highway speeds.
When: Present from purchase and across all mileage ranges (290 miles through 106,000 miles); reported consistently across multiple model years 2015 and earlier Sierra 1500s
Symptoms owners cite: Dim illumination on low beam; Visibility limited to 30–50 feet or less ahead; Narrow, focused beam with little lateral spillage; Poor visibility on road edges and curves; Inability to see wildlife, pedestrians, or side hazards; Inadequate illumination in rain and fog
Repairs/costs cited: TSB #PIT5374 / PIT5374B: bulb replacement with VOLSA HIR bulbs and BCM reprogramming to increase voltage; reported marginal improvement only. Owners cite costs of $149–$200 for TSB work. Many owners report aftermarket LED/HID replacements ($300–$1,000) more effective than factory fix.
Recalls/TSBs owners mention: TSB #PIT5374 / PIT5374B issued for bulb upgrade and BCM voltage adjustment; GM later redesigned headlights for 2016 Sierra (HID lights); some owners report receiving confidential settlements of $200–$900 with NDA requirements; most dealer and GM customer service responses cite 'working as designed' or acknowledge no further remedy available; no factory recall issued.
Inadequate high beam illumination and beam aiming issues
High beams illuminate trees and sky rather than road surface, providing little forward illumination benefit. Single-bulb design (one halogen filament for both low and high) creates a no-win adjustment scenario: aiming for adequate low beam results in high beams pointing skyward; adjusting for road-level high beams leaves low beams dangerously dim.
When: Present from purchase; reported across all mileage ranges
Symptoms owners cite: High beams shine upward into tree tops and signs; High beams provide minimal road surface illumination; Asymmetrical beam aiming (driver-side vs. passenger-side inconsistency noted); No meaningful improvement in visibility when switching from low to high beam; High beams point straight out or too high on lateral axis
Repairs/costs cited: Dealer adjustments to headlight aim yield little improvement. Some owners cite BCM reprogramming as part of TSB response but report continued poor high-beam performance.
Recalls/TSBs owners mention: TSB #PIT5374 includes aim adjustment; dealers report inability to resolve issue; GM cites design as factory specification; 2016+ models use different HID design, indicating GM awareness of problem.
Poor lateral (side) illumination
Projector headlights produce a focused straight-ahead beam with almost no light spilling to left and right sides of the road. Owners cannot see road edges, curves, or side hazards (wildlife, pedestrians, obstacles) without fog lights.
When: Present from purchase; problematic on curves, rural roads, and when turning
Symptoms owners cite: No illumination to sides of road; Unable to see around curves until straightened out; Dangerous blind spots when turning; Cannot see wildlife or pedestrians on road shoulders; Fog lights required to see laterally; Sharp cutoff line preventing view of road edges and small rises 20–30 feet ahead
Repairs/costs cited: Fog lights cited as necessary supplement for safe lateral visibility; upgrading to aftermarket lights reported to restore side illumination.
Recalls/TSBs owners mention: No factory fix; TSB does not address lateral coverage deficiency; 2016+ HID redesign includes improved lateral illumination, confirming GM knowledge of issue.
Severe degradation in rain and wet conditions
Headlight performance drops significantly in rain, fog, or snow, reducing already-poor illumination to nearly zero. Owners report lights become nearly invisible and driving feels unsafe or impossible.
When: Occurs during wet weather or rain events
Symptoms owners cite: Lights appear to be off during rain; Minimal to no visible illumination in rain or snow; Severe visibility loss in wet conditions; Fog and mist exacerbate dimness
Repairs/costs cited: TSB bulb upgrade provides no improvement in wet conditions. Owners resort to fog lights or avoid night driving in rain.
Recalls/TSBs owners mention: No specific remedy offered; TSB does not address wet-condition performance.
Third brake light gasket failure causing interior water intrusion
Gasket seal on the third (center high-mounted) brake light fails, allowing rainwater to enter the truck cabin. Water damage affects headliner, carpet, insulation, and interior trim; mold and musty odors persist.
When: Failures noted; duration and timing of leak unknown until visible water damage and odor detection (one owner detected issue around 5+ weeks of parking).
Symptoms owners cite: Water entry into cabin through third brake light; Wet headliner and carpet on passenger-side floor; Interior insulation saturation; Mold and persistent musty odor; Extensive interior contamination requiring removal of seats, carpet, and insulation
Repairs/costs cited: Dealer diagnosis confirmed gasket failure. One owner cited repair estimate of $4,500–$5,000 for full restoration (headliner, carpet, insulation replacement); GM offered $585 partial assistance, leaving ~$1,300 shortfall for owner out of warranty.
Recalls/TSBs owners mention: Limited goodwill assistance ($585 on $4,500–$5,000 repair); vehicle out of factory warranty; GM case manager attempted to negotiate additional assistance but no full remedy documented.
Asymmetrical right-side headlight and fog light dimming
Right-side headlight and fog light operate dimmer than left-side counterpart. Associated with erroneous right-turn signal error message in instrument cluster (fast blinking, error light) despite bulb functioning and not being blown.
When: Occurs both stationary and in motion
Symptoms owners cite: Right headlight and fog light dim compared to left; Right turn signal shows error message in cluster; Fast blinking of turn signal indicator; Turn signal bulb appears functional but generates false error code
Repairs/costs cited: Not specified in narrative; issue not resolved by owner.
Synthesized from 112 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
Tl* the contact owns a 2015 GMC sierra. While driving 30 MPH, the headlights were dim and the contact could not view the road properly. The contact was concerned for his safety. The failure recurred multiple times. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The VIN was not available. The approximate failure mileage was 12,500.
Headlights are so dim, (high and low beam), that they should be considered a serious safety issue.
Tl* the contact owns a 2015 GMC sierra 1500. The contact stated that the headlights were very dim making it difficult to view the road while driving at night. The contact stated that the vehicle was taken to varney Buick GMC Mazda (260 hogan rd, bangor, me 04401) where the bulbs were replaced under a technical service bulletin however, the bulb replacement failed to fix the failure. The contact…
Headlights are not safe to be used in the dark. Driving on curvy, hilly roads is very dangerous. Can not see well. High beams barely different from low beams. Live in town so this was first time out on road at night. Scary. Can't imagine what it would have been like in rain or snow storm.
Had lighting trouble with your 2015 GMC Sierra?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the lighting problem on the 2015 GMC Sierra?
It's a documented issue but not catastrophic. 112 complaints have been filed. Repairs average $250 and most owners catch it before it causes a breakdown.
At what mileage does the lighting typically fail?
Across the 43 complaints that reported odometer mileage, most lighting failures cluster between 3,000 and 30,000 miles, with the median around 12,000. A quarter of owners report trouble before 3,000; a quarter make it past 30,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $250 for lighting repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to lighting?
No active recalls currently cover lighting issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2015/GMC/Sierra.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.