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 ↗2014 GMC Terrain electrical problems
moderate Owners of the 2014 GMC Terrain have filed 27 NHTSA complaints about the electrical, typically surfacing around 40,000 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
27
Recalls
0
Avg fix
$850
| Model year | electrical complaints |
|---|---|
| 2010 Terrain | 40 |
| 2011 Terrain | 23 |
| 2012 Terrain | 28 |
| 2013 Terrain | 16 |
| 2014 Terrain (this page) | 27 |
| 2015 Terrain | 25 |
| 2016 Terrain | 6 |
| 2017 Terrain | 6 |
| 2018 Terrain | 29 |
What stands out
Owners have filed 27 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.
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.
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 OnStar Module 2G Sunset Information.
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 2014 GMC Terrain shows a pattern of serious electrical failures across multiple systems. Owners report complete shutdown while driving—engine dying, headlights cutting out, computer crashing, and steering wheel locking at highway speeds. Some vehicles refuse to start, with locked steering wheels and no warning lights. Ignition keys get stuck and won't turn or come out, sometimes requiring battery disconnects to extract them.
The infotainment and dashboard systems fail repeatedly. Screens go black, radios cut out mid-drive, backup cameras freeze on, and audio controls become unresponsive. The forward collision warning system activates with nothing in front of the vehicle or fails to activate when cars are actually present—creating real accident hazards.
Multiple owners report diagnostic shops unable to pinpoint causes; some diagnostics throw no codes at all. One owner's garage found the ECM failed and parts are on GM hold due to a known issue, but the recall only covers 2018 models. Another owner's transmission warning light keeps coming back, even after disconnecting the battery to reset. Several vehicles have required engine replacement or sit in shops indefinitely waiting for unavailable parts. These are not minor glitches—they're safety-critical failures with no clear fixes.
Same GMC Terrain electrical reports on nearby years: 2011 · 2012 · 2013 · 2015
Failure modes owners describe
Complete electrical shutdown while driving
Engine shuts off, headlights cut out, computer system dies, and steering wheel locks while vehicle is in motion at highway speeds. Owner able to restart after cycling ignition.
When: 15,000 miles; 2,484 miles
Symptoms owners cite: engine stalled at 45-50 mph and 70 mph; headlights turned off; computer system shut down; gas indicator went to E; steering wheel began to lock up; reduced engine power and traction control warning lights illuminated
Repairs/costs cited: One case noted separated cable from motor that needed tightening; vehicle not repaired
No-start with locked steering wheel
Vehicle fails to start and steering wheel locks. Tow truck driver or mechanic able to restart vehicle after multiple attempts. Recurs intermittently with no warning lights.
When: Unknown mileage
Symptoms owners cite: failed to start; steering wheel was locked; no warning light illuminated
Repairs/costs cited: Tow truck driver restarted vehicle; no diagnosis or repair performed
Ignition key stuck or difficult to remove
Key becomes stuck in ignition and cannot be removed. In another case, key will not turn all the way out and requires disconnecting battery to extract. Gear shifter also sticks in park.
When: 56,000 miles; unknown mileage
Symptoms owners cite: key stuck in ignition unable to remove; key will not turn all the way when shifting from drive to park; gear shifter sticks in park; key extremely hard to turn in reverse or drive
Repairs/costs cited: Ignition switch likely at fault per dealer diagnosis; no repair performed in first case
Intermittent no-start with no diagnostic codes
Vehicle fails to start without warning lights. Cranks up after several hours of sitting. Diagnostic testing throws no codes. Battery and fuses test fine.
When: Unknown mileage
Symptoms owners cite: would not start; no lights came on dash as warning
Repairs/costs cited: Diagnostic run with no codes thrown
ECM failure and parts unavailability
Vehicle will not start; garage diagnoses ECM failure. GM has a hold on sale and install of the part due to known issue affecting multiple model years. Recall exists only for 2018 models, leaving 2014 owners without remedy.
When: Unknown mileage
Symptoms owners cite: car would not start
Repairs/costs cited: ECM replacement needed but part unavailable; vehicle sits at garage indefinitely
Recalls/TSBs owners mention: Recall issued for 2018 GMC Terrain ECM only; no recall for 2014
Infotainment system freezing and blackout
Touchscreen freezes or goes black intermittently, rendering audio controls unusable. Backup camera remains stuck on even while driving forward. Climate controls still operable but display is dark.
When: Unknown mileage
Symptoms owners cite: infotainment system freezes; screen goes black; cannot use audio controls; backup camera stuck on while driving forward
Dashboard and radio flickering and shutting off while driving
Dashboard lights, radio, and backup camera cut on and off intermittently during normal driving and reversing. Components work sporadically.
When: Unknown mileage
Symptoms owners cite: dashboard and radio flicker on and off; majority of time stays off; backup camera works when it feels like it; radio and dashboard lights cut off while driving; camera shuts off while backing up
Forward collision warning system false activation
Collision warning system activates with no vehicles present in front or opposing lanes. Happens intermittently; owner disables system due to hazard potential. In another case, system fails to activate when vehicles are actually present.
When: 30,125 miles; unknown mileage
Symptoms owners cite: crash warning light illuminated intermittently; vehicle decelerated and brakes engaged independently; collision warning system activated with no vehicles in sight; forward collision alert comes on when nothing is in front; won't come on when car is in front
Horn failure due to blown fuse
Horn fails to work while driving. Dealer diagnoses blown fuse caused by electrical short.
When: 30,885 miles
Symptoms owners cite: horn failed to work
Repairs/costs cited: Fuse replaced due to short
All service engine lights illuminated with drivability loss
All service engine warning lights illuminate simultaneously. Vehicle de-accelerates to limp mode. Dealership unable to duplicate problem or find cause on diagnostic testing.
When: Unknown mileage
Symptoms owners cite: all service engine lights displayed; car de-accelerated
Repairs/costs cited: No problem found in diagnostic testing
Ignition key gets extremely hot with AC on
Ignition key becomes very hot to touch when air conditioner is running while driving. Does not occur when truck is idling. Reported to dealership.
When: Unknown mileage
Symptoms owners cite: ignition key gets extremely hot while driving with AC on; does not happen if truck is idling
Audio system, alert button, and audible notifications failure
Multiple audio-related systems fail completely: radio, Onstar button, seatbelt chime, turn signal sound, blinker chime, and other audible notifications stop working.
When: Unknown mileage
Symptoms owners cite: nothing works anymore; sound that controls onstar, seatbelt, blinker, turning signal, chime, and other notifications not working
Engine failure and catastrophic shutdown while driving
Vehicle cuts off and will not restart while driving on city streets. Requires towing to dealer. In one case, dealer diagnosis indicated engine requires replacement.
When: Unknown mileage
Symptoms owners cite: car cut off and will not start; car started making a noise and cut off and did not start
Repairs/costs cited: One case required new engine per dealer
Synthesized from 27 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had electrical trouble with your 2014 GMC Terrain?
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 2014 GMC Terrain?
It's a documented issue but not catastrophic. 27 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 18 complaints that reported odometer mileage, most electrical failures cluster between 20,000 and 86,000 miles, with the median around 40,000. A quarter of owners report trouble before 20,000; a quarter make it past 86,000. 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/2014/GMC/Terrain.
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.