Very limited while driving in the dark cause head lights go off and can’t drive in the rain or snow cause wipers turn off not save for my family and I and other drivers on the road Thai all happen, After the dealer (Lithia Chevrolet of Redding, CA) performed GM recall programming on the Serial Data Gateway Module (SDGM) and related software updates, my truck began having serious electrical…
2024 Chevrolet Silverado HD electrical problems
moderate 48 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Complaints
48
Recalls
0
Avg fix
$850
1fire
When does it fail?
Of the 48 electrical complaints filed for the 2024 Chevrolet Silverado HD, 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
Of the 6 model years of Chevrolet Silverado HD we track for electrical problems, this one carries the most owner complaints on file — 48.
Electrical accounts for 36% of every owner complaint on file for this vehicle — the dominant problem area across 7 categories tracked.
The failure pattern owners describe
The dominant complaint across these 46 narratives is intermittent loss of trailer brakes on 2024 Silverado HD trucks while towing. Owners report the integrated brake controller repeatedly displays "check trailer wiring," "trailer brakes disconnected," or "service trailer brakes" messages—sometimes 30 to 40 times per drive—even with firmly seated connectors and dielectric grease applied. When the warning appears, trailer brakes simply do not work, forcing the truck's brakes to handle both truck and trailer weight, a dangerous scenario especially on steep grades or emergency stops. The same trailers work fine on Ford and Dodge trucks or on older Silverado models (2021, 2023), pointing to a truck defect.
GM issued service bulletin #6379278 acknowledging the issue stems from trailer solar panels backfeeding voltage into the brake module when the trailer battery charges higher than the truck's battery, triggering an internal shutdown. Disconnecting solar panels eliminates the problem, but not all trailers have easily removable panels. Dealer responses vary wildly: some blame the trailer, some blame LED lights, some claim nothing is wrong even after the failure is reproduced on-site, and some suggest a $200 aftermarket adapter is the "fix."
Separate electrical failures appear across the fleet: flickering exterior and interior lights immediately after SDGM recall work, instrument clusters going blank, headlights shutting off during night driving, turn signals entering hyperflash mode and becoming inoperative, and loss of audible alerts. One owner's truck lost communication with the brake system control module and engine control module eleven times according to dealership printouts. Owners consistently report dealerships cannot or will not replicate these faults and refuse warranty repairs when they cannot duplicate the problem on demand, despite video documentation and multiple service records.
Same Chevrolet Silverado HD electrical reports on nearby years: 2021 · 2022 · 2023
Failure modes owners describe
Intermittent Trailer Brake Module Disconnection
The integrated trailer brake controller intermittently fails to recognize the connected trailer or loses connection while towing, displaying messages like 'check trailer wiring,' 'trailer brakes disconnected,' or 'service trailer brakes.' When disconnected, trailer brakes become inoperative. The issue occurs repeatedly during a single drive (30-40 times reported) and recurs across multiple drives. Occurs with standard 7-pin 12-volt connectors and affects multiple trailers with the same truck, but the same trailers work fine on other vehicles (Ford, Dodge, 2021 or 2023 Silverado models).
When: Intermittent; onset typically within first weeks to months of ownership; occurs at various speeds and mileages (reports range from 55 miles to 63,500 miles). Often worse during mid-morning to evening hours during long towing runs.
Symptoms owners cite: Dashboard warning 'check trailer wiring'; Dashboard warning 'trailer brakes disconnected'; Dashboard warning 'service trailer brakes'; Trailer brakes fail to engage when warning is active; Warnings disappear intermittently, system shows 'trailer connected' and brakes resume; Cycle repeats multiple times per drive
Codes mentioned: Trailer brake control module fault, Communication loss between truck and trailer
Repairs/costs cited: Trailer control module replacement attempted on multiple vehicles without resolution. GM bulletin document #6379278 addresses solar panel backfeed issue but no fix provided. Non-GM aftermarket brake controllers mentioned as solution by some owners. Disconnecting solar panels from trailer eliminates issue in cases with solar-equipped trailers.
Recalls/TSBs owners mention: GM issued service bulletin document #6379278 stating trailer battery charger (solar panel) causes backfeed when trailer battery voltage exceeds truck battery voltage, triggering brake module shutdown. Interim workaround: disconnect trailer solar panels. Dealer response inconsistent: some blamed trailer, some blamed LED lights, some said no defect found, some recommended aftermarket adapters ($200). GM refused buyback in at least one case despite multiple service visits and attorney involvement.
Trailer Brake Gain Adjustment Failure
The trailer brake controller periodically fails to allow adjustment of brake gain (sensitivity) while towing. The driver cannot increase gain to adequately stop heavy loads, creating a loss of braking capability. Issue occurs with multiple trailers and persists after multiple brake controller component replacements. No other vehicles pulling the same trailers experience this problem.
When: Intermittent; occurs during operation on interstate and mountain roads with heavy-load towing. Reported as occurring since original purchase of vehicle.
Symptoms owners cite: Unable to adjust trailer brake gain during towing; Loss of ability to stop vehicle effectively with heavy trailers; Nearly caused accidents on interstate and mountain descents
Repairs/costs cited: Multiple brake controller component replacements performed by dealerships without fixing the issue. Owner documented problem on video but dealership and manufacturer unable to resolve.
Recalls/TSBs owners mention: Dealers blamed trailer and claimed no defect in truck. Manufacturer did not provide assistance. No recall or service bulletin found in narratives for this specific failure mode.
Lighting Flicker After Recall Programming
Following SDGM (Serial Data Gateway Module) recall reprogramming and software updates, exterior lights, interior lights, and trailer lights began flickering on and off while driving. Windshield wipers also pause or stop momentarily during flicker events. Headlights go completely off in darkness; wipers shut off in rain or snow. None of these issues existed before the recall work.
When: Onset immediately after SDGM recall programming and software update performed at dealership. Occurring during low-light driving and precipitation conditions.
Symptoms owners cite: Exterior lights flicker on/off while driving; Interior lights flicker on/off while driving; Trailer lights flicker on/off while driving; Headlights go off during night driving; Windshield wipers pause or stop momentarily during flicker; Wipers shut off during rain or snow; Affects trailer braking/lighting circuits
Codes mentioned: Serial Data Gateway Module (SDGM) communication fault
Repairs/costs cited: Appears to be module reset or corrupted calibration from recall reprogramming. Dealer refuses to accept responsibility, stating recall is 'closed.' Truck deemed unsafe to operate at night or in wet conditions.
Recalls/TSBs owners mention: GM has reported to NHTSA hundreds of field complaints about flickering headlamps on 2024 trucks and identified lighting flicker as a safety defect. Owner has active GM case opened for this issue.
Turn Signal Hyperflash and Inoperability
When operating turn signals, the vehicle displays 'Check Right Front Turn Lamp' or 'Check Left Front Turn Lamp' error messages. The turn signal then enters a rapid 'hyperflash' state indicating a fault and becomes non-functional. Turn signal only resumes normal operation after vehicle is shut off and restarted. Issue occurs intermittently.
When: Intermittent; occurs when turn signals are operated.
Symptoms owners cite: Error message 'Check Right Front Turn Lamp' or 'Check Left Front Turn Lamp'; Turn signal enters hyperflash mode; Turn signal rendered non-functional during error state; Requires vehicle restart to clear error and restore function
Repairs/costs cited: Dealer reflashed computer with latest software; problem persisted. Dealer indicated issue is software-related, not turn signal hardware failure.
Recalls/TSBs owners mention: No recall or TSB identified in narratives. Dealer advised software issue rather than hardware defect.
Park Assist Error Message
Error message 'Park Assist Blocked See Owner's Manual' displays intermittently on the instrument cluster. Message persists after multiple dealership repair attempts. Related to faulty backup camera or assistance equipment, increasing accident risk while backing up.
When: Onset shortly after purchase (July 2, 2023). Continued intermittently through complaint date. Vehicle in shop 61 days out of 18 days of ownership.
Symptoms owners cite: Intermittent 'Park Assist Blocked' error message on dash
Repairs/costs cited: Dealership attempted repair but issue unresolved. Vehicle in shop extended periods without resolution.
Recalls/TSBs owners mention: No effective repair provided. Owner pursued lemon law claim and buyback; GM initially refused buyback.
Key Not Found Warning During Driving
Error message 'Key Not Found' appears on the instrument cluster while driving at normal highway speed (50 mph reported), indicating a loss of keyless authentication. Occurred twice. Creates significant confusion and safety concern.
When: Intermittent; one report during 50 mph highway driving.
Symptoms owners cite: Dashboard warning 'Key Not Found' during operation at 50 mph
Repairs/costs cited: Dealership indicated issue was fixed with software update.
Recalls/TSBs owners mention: Software update applied by dealer.
Loss of Audio and Audible Alerts
Audible alerts fail to operate as needed. Door chime fails to sound when doors are opened or seatbelt is unlatched. No warning light illuminates with audio failure. Intermittent loss of audio system functionality.
When: Intermittent; occurring while vehicle stationary, being driven, and while parked. Reported at approximately 7,400 miles.
Symptoms owners cite: Audible chime fails when doors opened; Audible chime fails when seatbelt unlatched; Intermittent loss of audio system; No warning light illumination during failure
Repairs/costs cited: Diagnosed as intermittent loss of audio; vehicle not repaired.
Recalls/TSBs owners mention: Manufacturer referred contact to NHTSA Hotline to report failure.
Instrument Cluster Malfunctions
Instrument cluster screen goes blank or blinks on and off, displaying 'Service Instrument Cluster' message. Loss of all speed, fuel remaining, warning indicators, and gauge displays. Driver unable to determine vehicle performance or status. In one case, cluster completely stopped working after software recall work with replacement on backorder.
When: Intermittent and persistent. One case immediately following software recall work.
Symptoms owners cite: Screen blinking on and off; Display of 'Service Instrument Cluster' message; Loss of speed indicator; Loss of fuel indicator; Loss of warning lights and gauges; Inability to determine gear selection
Repairs/costs cited: In one case, software recall work completed but did not fix issue. Replacement cluster on backorder.
Recalls/TSBs owners mention: No immediate resolution in narratives.
Parasitic Battery Drain and System Malfunctions
Batteries are drawn down by parasitic electrical drain. Tailgate will not operate from outside truck controls. Infotainment system malfunctions. Lights flash periodically. Issue occurs repeatedly.
When: Occurred twice within one month. Issue recurring.
Symptoms owners cite: Battery drain (parasitic draw); Tailgate inoperative from external controls; Infotainment system malfunction; Lights flashing periodically
Repairs/costs cited: Owner replaced both batteries with Napa batteries after first occurrence, but issue recurred within one month. Dealer investigation ongoing.
Recalls/TSBs owners mention: Dealer diagnostics ongoing.
Continuous Check Engine Light and Limp Mode
Check engine light illuminates continuously and vehicle enters limp mode operation, severely limiting drivability. Vehicle cannot be driven daily and spends majority of time at dealership for software updates and computer repairs.
When: Recurring; ongoing issue requiring multiple dealership visits for updates.
Symptoms owners cite: Check engine light on continuously; Vehicle enters limp mode; Severely reduced drivability; Frequent need for computer/software updates
Repairs/costs cited: Issue attributed to computer/software problems rather than equipment failure. Requires repeated software updates and dealer service.
Recalls/TSBs owners mention: Software updates provided by GM, but issue persists across multiple visits.
Tailgate Latch Failure and Unintended Dropout
Power tailgate drops unintentionally while vehicle is in operation or parked. Tailgate opens and closes by itself without user input. Despite recall completion on tailgate latch, failures continue. No warning system alerts driver to tailgate position change.
When: Occurs during driving and when parked. Can occur at any time without warning.
Symptoms owners cite: Tailgate drops unintentionally during operation; Tailgate opens and closes by itself; No warning system for tailgate position change; No audible or visual alert when tailgate opens
Repairs/costs cited: Recall for tailgate latch completed; issue persists. One case involved tailgate dropping onto trailer tongue, causing damage. Owner questions effectiveness of recall repair.
Recalls/TSBs owners mention: Recall completed but failure persists. No warning system added.
Synthesized from 48 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 7 most recent
On July 1st, 2023, I purchased a 2024 Chevrolet Silverado 2500 from Orielly Chevrolet in Tucson, Arizona. On July 2nd, 2023, an error message popped up on the dash, “Park Assist Blocked See Owner’s Manual”. It continued to happen on and off til this very day. The dealership "attempted" to fix the issue, but it obviously hasn't been resolved. Due to equipment being faulty, the chances of an…
The contact owns a 2024 Chevrolet Silverado 2500. The contact stated that while hauling a travel trailer at various speeds, the check trailer wiring warning message intermittently flashed on the instrument panel. The contact had taken the vehicle and the travel trailer to the respective dealers; however, neither dealer were able to determine the cause of the failure. Upon investigation, the…
The integrate trailer brake control system malfunctions when a trailer equipped with solar panels is hooked up. I recently rented a newer travel trailer and kept on getting a warning that the brake control system was disengaging. Every 30-60 seconds the system would connect and the quickly disconnect. I troubleshooted by hooking up a trailer without solar and the brake controller worked as…
The GM brake controller will disconnect with the trailer being pulled. You get a message on the information center that the brake controller has lost connection with the trailer or no trailer brakes are available, something to that effect. This has happened up to 5 times in one day. You never know when this will happen. Pulling a 7,000lb trailer and not knowing when you will have 'no brakes'…
Instrument Cluster screen blinking On/Off and showing "Service Instrument Cluster" message. Lost all indications of speed, warnings, gauges, gear selection. Could not tell if vehicle was performing correctly. All sensors appeared to be working, but indications to driver missing.
I kept getting “check trailer wiring” messages followed by a “trailer disconnected” message while towing a trailer and the trailer brakes would not engage. The trailer would “reconnect” and then “disconnect” constantly while driving. I lost my trailer brakes while trying to brake down a hill. Not having working trailer brakes is extremely dangerous.
Had electrical trouble with your 2024 Chevrolet Silverado HD?
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 electrical problem on the 2024 Chevrolet Silverado HD?
It's a documented issue but not catastrophic. 48 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Based on the 48 complaints filed, electrical issues most often appear around 15,486 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $850 for electrical 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 electrical?
No active recalls currently cover electrical 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/2024/Chevrolet/Silverado HD.
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.