This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use for certain repairs, such as Wiring Harness Repairs.
full bulletin at NHTSA ↗2018 GMC Acadia electrical problems
moderate Owners of the 2018 GMC Acadia have filed 70 NHTSA complaints about the electrical, typically surfacing around 31,000 miles at roughly $850 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See electrical across all vehicles →
Failure mileage
Complaints
70
Recalls
0
Avg fix
$850
| Model year | electrical complaints |
|---|---|
| 2014 Acadia | 79 |
| 2015 Acadia | 29 |
| 2016 Acadia | 21 |
| 2017 Acadia | 143 |
| 2018 Acadia (this page) | 70 |
| 2019 Acadia | 70 |
| 2020 Acadia | 21 |
| 2021 Acadia | 28 |
| 2022 Acadia | 10 |
1crash
1fire
When does it fail?
Of the 70 electrical complaints filed for the 2018 GMC Acadia, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 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 70 electrical 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.
No new NHTSA electrical complaint has been filed on this vehicle in over 6 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical 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 service bulletin provides a repair procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated - DTC P3055 Set.
full bulletin at NHTSA ↗The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.
full bulletin at NHTSA ↗This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E4403, M4404, M4413, M6954, M6955, E4414, E4423, E4491, E4492, or E6961 and resolution information.
full bulletin at NHTSA ↗This service bulletin provides information to diagnose batteries that have set for a long period of time and/or cold weather climates and testing those batteries.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2018 GMC Acadia electrical system exhibits a dominant failure: the transmission does not recognize Park position. Owners put the vehicle in Park, press the stop button, and the dashboard displays "Shift to Park" with continuous beeping—even though the transmission is clearly parked. The engine shuts off but electrical systems stay live, draining batteries. Most owners must restart the vehicle repeatedly, shift through Drive or Reverse back to Park, and retry shutdown multiple times—sometimes taking 20+ attempts or 20 minutes in 100-degree heat. This happens intermittently or nearly every shutdown.
The defect recurs even after dealer repairs (shifter replacement, harness replacement, transmission control assembly replacement). Repair costs range $400–$2,000 out of warranty. GM issued technical service bulletins acknowledging the issue but has not issued a nationwide recall despite thousands of complaints and class action lawsuits. Owners report batteries dead and stranded multiple times; one replaced a battery at 13,013 miles due to this single defect.
Beyond Shift to Park, owners report random engine shutdowns while driving—loss of power steering and braking on highways—with no check engine light warning. One vehicle caught fire while parked with ignition on. Multiple sensor failures, StabiliTrak malfunction pulling the vehicle out of its lane at highway speeds, thermostat failures, and a factory PCM defect affecting power steering and AC round out the electrical and powertrain picture. No permanent solution exists for most failures.
Same GMC Acadia electrical reports on nearby years: 2016 · 2017 · 2019 · 2020 · 2021
Failure modes owners describe
Shift to Park detection failure
Transmission control module or shift position sensor fails to recognize that the transmission is actually in Park, preventing the vehicle from turning off fully and triggering repeated "Shift to Park" warning messages and audible alarms that drain the battery.
When: Typically between 12,000–65,000 miles; some owners report it recurring after dealer repair
Symptoms owners cite: "Shift to Park" error message displayed on dashboard even when transmission clearly in Park; Audible beeping/chiming alarm that continues even after engine shut off; Vehicle will not turn off completely; electrical systems remain active; Cannot lock vehicle doors while error persists; Requires multiple restarts and shifting between Drive/Reverse and Park before system recognizes Park; Temporary clearing by jiggling shifter or repeatedly cycling gears; Battery drain leading to dead batteries
Codes mentioned: TSB 19-NA-206, TSB 18-NA-297, PIT5616A
Repairs/costs cited: Dealers have replaced transmission control assembly, shift harness, parking assist module, shifter, and ignition switch. Repairs range $400–$2,000; some owners report recurrence within 2–3 months or 2 years post-repair. One owner paid $1,569 for shifter, harness, and parking assist module replacement at 12,000 miles. Repair costs $500–$900+ out of pocket for out-of-warranty vehicles.
Recalls/TSBs owners mention: GM issued TSBs 19-NA-206, 18-NA-297, and PIT5616A acknowledging the defect. No nationwide recall issued despite thousands of complaints and multiple class action lawsuits. Some owners report their VINs were not included in partial recalls despite having the identical issue. GM has not provided a permanent solution.
Random engine shutdown while driving
Engine shuts off without warning while driving on highways and city streets, creating loss of power steering and braking assist.
When: Occurred at undisclosed speeds and mileage
Symptoms owners cite: Engine randomly shuts off while driving at highway and city speeds; Loss of power steering assist; Loss of braking assist; No apparent check engine light warning prior to failure
Repairs/costs cited: Issue has not been fully diagnosed or resolved by service centers
Vehicle fire
Vehicle caught fire while parked in driveway with ignition on, igniting nearby tree and destroying garage and driveway. Fire consumed vehicle in under 5 minutes.
When: December 5, 2019; vehicle had been running with ignition on for approximately 2 minutes
Symptoms owners cite: Vehicle ignition left on while parked; Fire started under unknown electrical conditions; Fire spread rapidly and was not extinguishable with fire extinguisher
Repairs/costs cited: Vehicle was a total loss; no repair attempted
Recalls/TSBs owners mention: Owner reports recall existed for 2017–2018 GMC Acadia fire risk but received no notification letter, email, or phone call from GM
StabiliTrak malfunction with unintended lane correction
StabiliTrak system activates and sends "Service StabiliTrak" warning on dash while driving; system attempts to auto-correct vehicle path pulling vehicle out of lane at highway speeds without driver input or road curves.
When: While driving at 46 mph on straight street; also at highway speeds
Symptoms owners cite: "Service StabiliTrak" warning message appears and disappears on dashboard while in motion; System does not log event in diagnostics; Unintended auto-correction pulls vehicle out of lane on straight road; Occurs at multiple speeds and with different drivers; Side mirrors reset themselves unprompted; Memory seat function fails to move seat to preset position despite button activation
Repairs/costs cited: Dealership unable to identify cause; vehicle spent over 2 months in dealer service attempting repairs with multiple rental cars provided
Electrical sensor and warning light faults
Multiple electrical sensors fail; dashboard warning lights illuminate for non-existent conditions (e.g., liftgate warning when liftgate is closed); radio fails to operate; automatic door locks fail; dome light illuminates when doors are shut.
When: At approximately 200,000 miles and earlier mileages; symptoms began after purchase and continued throughout ownership
Symptoms owners cite: Rear liftgate warning light illuminates with liftgate closed; Liftgate fails to latch securely requiring bungy cord to secure; Dome light illuminates indicating doors open when doors are closed and secure; Radio fails to operate; Automatic door locks fail to engage; Various warning lights and sensor alerts appear repeatedly
Repairs/costs cited: Vehicle not diagnosed or repaired; sensor failure noted but remedy unavailable due to parts shortage
Battery drain and repeated battery replacement
Battery drains rapidly due to continuous electrical draw from Shift to Park failure and other electrical faults; owners forced to replace battery multiple times within short periods.
When: Throughout ownership; some owners replaced battery twice within a couple weeks; others report batteries lasting only 2–3 years
Symptoms owners cite: Battery drained to dead within hours or days; Vehicle stranded with dead battery; Battery appears to check good per dealer diagnostics despite repeated failures; Continuous electrical draw even when vehicle appears off
Repairs/costs cited: Owners report replacement battery costs; dealer states battery tests good despite repeated drain events
Engine acceleration stumble and loss of power
Engine shudders, stumbles, and loses power during acceleration without triggering check engine light; symptoms worsen over time creating highway safety concern.
When: At 29,000 miles
Symptoms owners cite: Shuddering and full loss of power during acceleration; Vehicle feels like it will stall on highway; No check engine light illuminated despite symptom severity
Repairs/costs cited: Dealership visited twice but unable to diagnose issue; owner requested battery replacement as precautionary measure under warranty; dealer confirmed alternator working
PCM defect causing multiple system failures
Powertrain control module contains factory defect that randomly triggers warning codes; causes loss of water temperature gauge, reduced power steering assist, and AC failure.
When: Defect existed from factory; discovered after 2 years of ownership
Symptoms owners cite: Water temperature gauge goes dark; Power steering wheel assistance reduced; AC stops working; Randomly triggered warning codes with no clear trigger
Repairs/costs cited: Requires PCM upgrade at owner expense
Recalls/TSBs owners mention: GM issued technical bulletin in 2018 but informed customers they must pay to upgrade defective PCM rather than initiating recall or warranty coverage
Remote start and keyless entry failures
Push-button start and remote key fob functions fail repeatedly; vehicle displays "Remote Device Not Detected" error and will not turn off via remote.
When: Intermittent; can occur multiple times during single outing
Symptoms owners cite: "Remote Device Not Detected" error appears on dashboard; Vehicle refuses to turn off when using remote button; Radio remains on after failed remote shutdown attempt; Multiple shutdown attempts required before vehicle finally powers down
Lane departure warning system non-functional
Lane detection safety system does not provide audible alerts when lane departure warning should activate.
When: Throughout ownership
Symptoms owners cite: Lane detection system active but provides no audible warning when needed
Thermostat and cooling system failure
Thermostat and cooling system fail prematurely; check engine light illuminates.
When: Within first 6 years of ownership; one owner experienced failure at 15,798 miles
Symptoms owners cite: Check engine light illuminates; Cooling system warnings displayed; Thermostat failure
Repairs/costs cited: Thermostat and cooling system replaced in 2024 by service center
Synthesized from 70 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 7 most recent
My 2018 acadia keeps giving error message "shift to park" , it has drained my battery twice I had to get new one. In order to shut off error, I have to restart ignition and move shifter to drive or reverse several times before error message to shut off. At times the vehicle still thinks it is on and then drains battery. I brought it in on september 2019 and the dealership replaced the harness…
Had to replace the shifter, harness, and parking assist module to the tune of $1569.00! When it was put into park the system would not acknowledge it was in park...therefore I could not lock the vehicle and an alarm kept going off. My Acadia only has 12,000 miles on it...NO excuse for having to replace those parts with or without a warranty! Dealership said I am not the only one this has happened…
I am getting a error message "shift to park" even when the vehicle is clearly in park. It drains the battery because you can't shut off the vehicle with the message. Have to jiggle the shifter after several attempts it may clear the message. Had one time I got out with the error message and the vehicle began to roll with no one in it even though the shifting area said "p" for park. And…
On december 5th 2019, I arrived home from work to take my son to his dr. Apt. I pulled into my driveway around 10:30am. I left the car on so my son wouldn't have to go into a cold car, being he way sick. I ran into my house where my mother was watching both my sons. I said to my mom, let me use the restroom quickly before I get his coat on. I was no more than 2 mins. As I stepped out the…
The car is put in park but the it doesn’t detect that it’s in park and won’t turn off. You can’t get out of your car because the won’t turn off. There were no errors before this. I get an error message that says shift to park. I have to shift the car into drive and then park several times to make the car turn register that it’s in park The dealership has not looked at my car. Nothing has ever…
I put the car in park, but the instrument panel reads "shift to park." the engine turns off, but the electrical system stays on because the car doesn't think it's actually in park. I have to turn the engine back on, shift to another gear, shift back to park, and turn the engine off to see if it registers that the car is in park. I've had to do this several times before the car actually registers…
The shift to park action required keeps popping up when I go to turn my car off. The car will be in park. I will have to turn the car on and off multiple times before the notification goes away and than im able to get out of the car.
Had electrical trouble with your 2018 GMC Acadia?
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 2018 GMC Acadia?
It's a documented issue but not catastrophic. 70 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?
Across the 30 complaints that reported odometer mileage, most electrical failures cluster between 26,000 and 39,000 miles, with the median around 31,000. A quarter of owners report trouble before 26,000; a quarter make it past 39,000. 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 $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/2018/GMC/Acadia.
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.