Our vehicle’s horn beeped and a message on the dash said vehicle not in park. I copied the following from your web site and am requesting an update: General Motors has acknowledged the "Shift to Park" issue through several Technical Service Bulletins (TSBs). While there hasn't been a formal safety recall for this specific shifter issue as of early 2026, a class-action lawsuit has been filed alleging one is needed.
The worst 2018 GMC Acadia problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Transmission164
- Electrical110
- Engine37
- Driver assistance26
- Steering24
- Brakes22
- Fuel system10
- Acceleration5
- Seats5
- Suspension5
- Seat belts4
- Wheels4
- Lights2
- Airbags1
- Body1
- Visibility1
Specific symptoms reported on the 2018 GMC Acadia
Battery drain 14Won't shift 12Check engine light 11Loss of power 7Jerking 6Transmission failure 6
Trouble codes owners of the 2018 GMC Acadia mention
P0128 4
Recalls 2
Fuel system, gasoline: delivery: fuel pump
- What is wrong
- General Motors LLC (GM) is recalling certain 2015-2018 GMC Canyon, 2016-2017 Buick Envision, 2016-2018 Chevrolet Colorado and Malibu, 2017-2018 GMC Acadia, 2018 Buick LaCrosse, Cadillac ATS, Chevrolet Equinox, and GMC Terrain vehicles. The high pressure fuel pump may detach from its mounting flange, possibly resulting in the pump damaging the high pressure fuel line.
- Risk
- A damaged fuel line can create a fuel leak, increasing the risk of a fire.
- Remedy
- GM will notify owners, and dealers will replace the high pressure fuel pump, and high pressure fuel pipe, free of charge. The recall began July 2, 2018. Owners may contact Buick customer service at 1‑800‑521‑7300, Cadillac customer service at 1‑800‑458‑8006, Chevrolet customer service at 1‑800‑222‑1020, or GMC customer service at 1‑800‑462‑8782. GM's number for this recall is 18188.
Recall number 18V358000 · Recall details
Power train: driveline: driveshaft
- What is wrong
- General Motors LLC (GM) is recalling certain 2018 Chevrolet Equinox and GMC Terrain vehicles and 2017-2018 GMC Acadia vehicles. The right front intermediate driveshaft may fracture and separate while driving.
- Risk
- If the front right intermediate drive shaft assembly separates while driving, the vehicle will lose propulsion, increasing the risk of a crash. If the assembly separates while parked on a grade, without the park brake engaged, the vehicle may move unintentionally, increasing the risk of a vehicle roll-away.
- Remedy
- GM will notify owners, and dealers will replace the right front intermediate drive shaft assembly, free of charge. The recall began August 25, 2017. Owners may contact GMC customer service at 1‑800‑462‑8782 or Chevrolet customer service at 1‑800‑222‑1020. GM's number for this recall is 17329.
Recall number 17V516000 · Recall details
Technical service bulletins for the 2018 GMC Acadia 1,071
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- This service bulletin provides information about GM Accessories
- This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
- This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
- PI to help diagnose A/C concern
- This preliminary information communicates information about how to determine if a wheel and tires size...
- This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a...
- This Preliminary Information communication provides information to the technician about vehicles that have...
- New Vehicle Monitoring Programs Section in IVH
- This Preliminary information communicates a possible issue with an engine timing chain, gear or crankshaft...
- This Preliminary Information communication provides information to the technician about vehicles that have...
2018 GMC Acadia fuel economy
Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.
| Engine | Drive | City | Highway | Combined |
|---|---|---|---|---|
| 2.5L 4‑cyl | FWD | 21 | 26 | 23 |
| 2.5L 4‑cyl | AWD | 21 | 25 | 23 |
| 3.6L 6‑cyl | FWD | 18 | 25 | 21 |
| 3.6L 6‑cyl | AWD | 17 | 25 | 20 |
What 2018 GMC Acadia owners say
Most recent owner complaints, unedited.
Steering assist warning comes on when I start the car and then the engine fan starts up very loudly and code PO128. My car has 48,000 miles and is a 2018. I am seeing this is a known issue and should be part of a recall so I want to know if it’s covered.
The contact owns a 2018 GMC Acadia. The contact stated that after parking the vehicle inside the garage, shifting to park(P) and turning off the vehicle, the vehicle suddenly rolled backwards approximately 3 feet. The contact stated that the failure had occurred on several occasions and the vehicle only moved backwards. During one failure, the vehicle almost struck a pedestrian walking behind it. The vehicle was taken to the dealer on several occasions, but no fault codes were retrieved and the vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 45,000.
I get error electric Steering assist reduced or unavailable drive with care at around 84234 miles on my car . Upon looking up problem on Internet it has to do with the Thermostat. I also found where Gm has a bulletin N252508350 which only seems to cover certain vehicles with the same problem. This seems to happen at all different miles driven on vehicles. I don't see how Gm can get away with only fixing certain vehicles with this safety problem when it shuts down the electric steering assist . This problem from what I can find on the internet is common to all years from 2017 up in Acadia with the 3.6L engine . The Thermostats seem to be defective and I feel Gm needs to address this problem for all of these vehicles . Not just for there special bulletin N252508350 which covers some vehicles in 2021with 3.6L engines. If the engine design was like the old engines and easy to replace the Thermostat by just taking out 2 bolts , I would say no problem I will replace it .But when you have to take half the Engine apart just to replace a 20.00 part that is defective that affects the steering of the vehicle, they need to have a safety recall.
The contact owns a 2018 GMC Acadia. The contact stated that while driving at an undisclosed speed, the power steering message was displayed, and the check engine warning light illuminated. In addition, the temperature gauge remained at zero. The dealer was contacted by phone and made aware of the failure. The vehicle was taken to the dealer, where it was diagnosed with a failed high-pressure fuel pump. The contact was informed that the high-pressure fuel pump needed to be replaced. The contact referenced an unknown recall; however, the VIN was not associated with a recall related to the failure. The manufacturer was contacted by phone and made aware of the failure. The contact was advised to contact the federal safety agency Hotline to report the failure. The failure mileage was approximately 112,300.
Urgent code going off due to thermostat not being red gauge is stuck
The car will frequently but not always fail to shut off when the start/stop button is pushed while in Park. The message "shift to park" come up on the display and a yellow light comes on in the button. I have to restart the engine and it often takes as many as 10 attempts to finally shut off the engine. Between each attempt I have to shift the transmission out of park and back into park. This has been happening for more than a month.
I’m getting a shift to park on my dash after it’s already in park. This causes the break to get stuck when driving.
I am unknown of what the issue is with the seatbelts on all seats will not properly lock.
The contact owns a 2018 GMC Acadia. The contact stated that while parking the vehicle, the gear shifter was shifted into park(P); however, the message “Shift to Park” was displayed. The gear shifter was moved back and forth, then shifted into park (P) before the proper gear was recognized. The vehicle was taken to the dealer, and the gear shifter was replaced, but the failure reoccurred. The vehicle was taken back to the dealer, and the gear shifter, switch, and harness were replaced. The manufacturer was made aware of the failure. The failure mileage was 10,000.
Compare the 2018 GMC Acadia
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Other model years
20072008200920102011201220132014201520162017201820192020202120222023202420252026
Questions about the 2018 GMC Acadia
Is the 2018 GMC Acadia reliable?
Owners have filed 399 complaints about the 2018 GMC Acadia, 1.3 times a typical Acadia model year.
What is the 2018 GMC Acadia year score?
The 2018 GMC Acadia scores 64 out of 100 (average). The score compares it with the other model years of the GMC Acadia: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2018 GMC Acadia?
Transmission and drivetrain, with 164 complaints, typically around 37,000 miles. Next is electrical (110).
How many recalls does the 2018 GMC Acadia have?
2 recalls, covering fuel system, gasoline and power train.
What gas mileage does the 2018 GMC Acadia get?
Official estimates for the 2018 GMC Acadia range from 20 to 23 mpg combined. The most efficient version (2.5L 4-cyl, FWD) gets 21 city and 26 highway.
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