This Preliminary Information communication advises the technician that vehicles with front seat Regular Production Option Codes A52, AZ3, or B3F may comment about low treble, or excessive bass from the front door speakers. This is a normal design characteristic for this seat configuration. These vehicles lack a subwoofer.
full bulletin at NHTSA ↗2015 GMC Sierra body problems
moderate 21 complaints filed with NHTSA · avg repair $1,500 · see body across all vehicles →
Failure mileage
Complaints
21
Recalls
0
Avg fix
$1,500
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering body 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.
This preliminary informational bulletin provides a procedure to replace a body plug to correct a body plugs vivible on vehicles equipped with 6 inch oval accessory chrome assist steps condition
full bulletin at NHTSA ↗This informational bulletin provides information on removing paint stains on the under side of protective shipping film
full bulletin at NHTSA ↗This Preliminary Information communication provides information to the technician about vehicles that have paint peeling from the anti-chip area. Technician should test another panel on a clean surface above room temperature. Technician will use a 2 inch wide piece of masking tape to the body, and pull upward quickly. If the paint flakes or peels away, the panel in question should be repaired.
full bulletin at NHTSA ↗This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that have remote start is inoperative, power lift-gate Regular Production Option Code (TB5) is inoperative with the ignition off, and vehicles equipped with the diesel engine, the blower motor may stay on after the engine is turned off. Technician may find Diagnostic Trouble Code P2537 set. Technician will need to Use a voltmeter and check circuit 5985 at the Engine Control Module and Transmission Control Module. If no or low voltage is found, use the wiring diagram in Service Information and perform normal circuit diagnosis.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2015 GMC Sierra has multiple design and manufacturing defects that owners are documenting. Paint adhesion is the most common complaint—factory paint doesn't stick to primer and peels off in sheets or chunks without impact damage. It happens on doors, roofs, and truck beds, sometimes within 3-5 years. Dealers acknowledge thin factory paint, but GM refuses warranty coverage.
Frame and component rust develops rapidly and severely—hose clamps in the engine bay corrode worse than vehicles twice as old. One owner's radiator hose clamp rusted completely through at 40,000 miles, dumping coolant. GM says surface rust isn't covered.
Water intrusion is another pattern. Roof-mounted antennas and third-brake light seals leak rainwater into the cabin. Rear seat metal rusts from the moisture. At least one owner's OnStar and navigation stopped working from water damage.
A design flaw lets mice enter the cabin air filter plenum through unscreened openings in the windshield wiper area. Mice nest in filters, saturating them with feces and dander. Owners clean filters repeatedly, but GM won't block the openings.
Additional issues include rear window spontaneous breakage, non-functional trailer brake due to cord weight, missing body mounts causing seat creaking, and peeling under-body coating exposing bare steel. Owners report GM's standard response is either denial or pointing to warranty expiration.
Same GMC Sierra body reports on nearby years: 2013 · 2014
Failure modes owners describe
Paint adhesion failure and peeling
Factory paint does not adhere properly to primer. Paint bubbles, blisters, peels, and falls off in chunks without prior damage. Occurs on doors, roof, truck bed, and other body panels. Paint failure can expose bare metal, allowing rust to develop beneath.
When: Varies; reported from under 5 years old to around 40,000 miles. Some owners noticed peeling after rain.
Symptoms owners cite: Paint bubbling and peeling; Paint flaking in sheets; Paint falling off in chunks; Visible primer showing through; Thin factory paint; Paint not adhering to primer; Clear coat flaking
Repairs/costs cited: Dealer body shops confirmed paint wasn't sticking to primer. One estimate cited $5,000 for repair; GM offered 40% coverage ($2,000), leaving owner responsible for $3,140. Most owners report GM refused warranty coverage, citing out-of-warranty status.
Recalls/TSBs owners mention: GM denied warranty coverage in multiple cases, stating paint defects were out of warranty.
Excessive surface rust on frame and engine components
Frame, suspension components, and engine bay hose clamps corrode severely and rapidly, even on vehicles regularly washed and garaged. Rust penetrates clamps used on critical systems. At least one radiator hose clamp rusted through completely, causing coolant loss.
When: At 24,000 to 40,000 miles; appears within first few years despite regular maintenance.
Symptoms owners cite: Heavy surface rust on frame; Rust on suspension components; Severe rust on hose clamps in engine bay; Rust worse than 9- to 10-year-old vehicles with higher mileage; Radiator hose clamp rusted through, causing coolant leak; Rust on rear seat metal from water intrusion
Repairs/costs cited: One owner had radiator hose clamp failure requiring hose replacement. Owners report dealer and GM responsibility unclear; rust damage not covered under warranty.
Recalls/TSBs owners mention: GM stated surface rust was not covered under warranty.
Water intrusion into cabin
Water leaks into the vehicle from roof-mounted antenna and third-brake light seal, causing dampness smell and rust damage to internal components. Electronics malfunction from water exposure.
When: Reported at 15,000 miles and within first few years of ownership.
Symptoms owners cite: Dampness smell inside cabin after rain; Water entering passenger side cabin; OnStar and navigation system malfunction; Rust on rear seat metal; Water damage to interior; Driver's seat creaking (possibly related to moisture damage)
Repairs/costs cited: Antenna replacement recommended by dealer; one owner replaced third-brake light seal with no resolution. No owner reports successful repair completion.
Recalls/TSBs owners mention: Manufacturer was notified in at least one case but no recall or design fix mentioned.
Cabin air filter contamination from rodent intrusion
Mice enter the cowl air plenum through unscreened openings in the plastic cover over the plenum near the windshield wiper area. Mice build nests on and in the cabin air filter, saturating it with dander and feces. Contaminants work through the filter into the cabin air, creating odor and potential respiratory hazard.
When: Multiple incidents within first 16 months of ownership reported.
Symptoms owners cite: Odor inside vehicle from mouse nesting and waste; Cabin air filter saturated with mouse dander and feces; Mice visible in cowl air plenum area; Health concern for people with respiratory conditions
Repairs/costs cited: Dealer replaced cabin filters and repaired damage at owner expense in some cases. No permanent screening or blocking of openings performed to prevent recurrence.
Recalls/TSBs owners mention: GM acknowledged with case number 711507394608 but took no corrective action. No design modification offered.
Rear window spontaneous failure
Rear windshield shattered while vehicle in normal operation. Defrosting system may have contributed; service bulletin N192265660 exists but does not apply to this vehicle.
When: One incident reported at approximately quarter mile from home.
Symptoms owners cite: Rear windshield shattered; Defrooster not functioning properly prior to breakage
Codes mentioned: N192265660
Repairs/costs cited: Owner mentions service bulletin N192265660 but vehicle not covered. No repair details provided.
Recalls/TSBs owners mention: Service bulletin N192265660 exists for this issue but does not cover this specific vehicle.
Trailer brake connector design defect
Trailer brake cord hangs due to its own weight, causing the connector to become nonfunctional. This renders the trailer unable to haul heavy materials and creates a safety hazard.
When: At 42,000 miles.
Symptoms owners cite: Trailer brake nonfunctional; Trailer brake fail message on instrument panel; Trailer unable to haul heavy materials; Safety hazard condition
Repairs/costs cited: Vehicle taken to dealer but not diagnosed or repaired.
Recalls/TSBs owners mention: Manufacturer was not made aware of this failure.
Missing body mount
Body mount missing under driver's side, causing vehicle body instability and structural creaking.
When: Observed during inspection; timing unclear.
Symptoms owners cite: Driver's seat creaks when making turns; Seat feels like it is about to come apart
Repairs/costs cited: Owner identified missing body mount during inspection but no repair details provided.
Under-body coating peeling
Protective under-body coating peels off on brand new truck, exposing steel and accelerating rust formation.
When: On brand new truck.
Symptoms owners cite: Under-body coating peeling; Steel completely exposed; Rusting of exposed steel
Synthesized from 21 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had body 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 body problem on the 2015 GMC Sierra?
It's a documented issue but not catastrophic. 21 complaints have been filed. Repairs average $1,500 and most owners catch it before it causes a breakdown.
At what mileage does the body typically fail?
Across the 15 complaints that reported odometer mileage, most body failures cluster between 15,000 and 77,000 miles, with the median around 36,000. A quarter of owners report trouble before 15,000; a quarter make it past 77,000. 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 $1,500 for body 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 body?
No active recalls currently cover body 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.