This service bulletin provides information for dealers/technicians on OnStar Module 2G Sunset Information.
full bulletin at NHTSA ↗2011 GMC Terrain electrical problems
moderate Owners of the 2011 GMC Terrain have filed 23 NHTSA complaints about the electrical, typically surfacing around 89,000 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
23
Recalls
0
Avg fix
$850
| Model year | electrical complaints |
|---|---|
| 2010 Terrain | 40 |
| 2011 Terrain (this page) | 23 |
| 2012 Terrain | 28 |
| 2013 Terrain | 16 |
| 2014 Terrain | 27 |
| 2015 Terrain | 25 |
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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 bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
full bulletin at NHTSA ↗This Preliminary information communicates a GM part number for reflective high temperature heat or insulating tape when repairing wiring harnesses.
full bulletin at NHTSA ↗This Preliminary Information communicates to the dealer the process for downloading or updating operating software for the Tire Pressure Monitor, Active Fuel Injector tester, multi media tester, PICO Scope, GR8 starting/charging tester and Vehicle Data Recorder tools, giving website address and step by step instructions to complete the update.
full bulletin at NHTSA ↗This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The dominant complaint across these 23 narratives is the 2011 Terrain randomly shutting off while driving—on the highway, in city traffic, at idle, during acceleration. Owners describe the engine dying without warning, sometimes at speeds of 35–70 mph, forcing them to pull over or nearly causing accidents. The vehicle restarts after stalling, but the problem recurs unpredictably. Dealerships have replaced cam sensors, throttle position sensors, O2 sensors, timing chains, and injectors multiple times on the same vehicles with no lasting fix.
Closely tied to stalling are sensor failures, especially cam position and throttle position sensors failing and needing repeated replacement. Multiple owners report six or more dealer visits for the same stalling issue with no resolution. One owner's service department contacted the manufacturer and was told they couldn't narrow it down.
Beyond stalling, owners cite excessive oil consumption requiring frequent top-ups, forcing some to pay for complete engine replacement out of pocket. Key and ignition system failures keep keys stuck in the ignition or prevent starting entirely. One owner experienced complete electrical shutdown with keys locked in the ignition and no way to recover power.
Phone system static on Bluetooth and OnStar worsens at highway speeds, rendering hands-free communication nearly useless. A sunroof water leak shorted the dashboard. Interior lights, wipers, and defroster controls fail intermittently. One vehicle caught fire. The automatic liftgate malfunctions with no obstruction detection, though related GM models have recalls for the same problem—the Terrain does not.
Same GMC Terrain electrical reports on nearby years: 2010 · 2012 · 2013 · 2014
Failure modes owners describe
Random stalling and loss of power
Engine shuts off without warning at any speed (highway, city, idle, low speed), sometimes entering reduced engine power mode. Vehicle restarts after stall. Some owners report stalling multiple times, others report it once or twice. Owners report close calls and near-accidents from sudden loss of power while driving.
When: As early as 4,100 miles; most commonly reported between 50k–120k miles; ongoing throughout ownership for many
Symptoms owners cite: Engine shuts off abruptly without warning; Reduced engine power mode activates; Check engine light may or may not illuminate; Vehicle restarts without issue after stall; Stalling at idle, during acceleration, or while driving at speed; Vehicle shakes or thumps when stalling occurs
Codes mentioned: P0420, P00013XX (cam position sensor codes), Generic check engine light (undiagnosed)
Repairs/costs cited: Dealerships have replaced sensors (cam, throttle position, O2 sensors multiple times), injectors, timing chain (51k miles reported), spark plugs, and various other engine components with limited or no success. Multiple visits to dealers (up to 5–6 times reported) with same issue recurring. Costs not always specified but repair efforts extensive. No lasting fix reported.
Recalls/TSBs owners mention: Dealership unable to replicate issue in many cases. Manufacturer contacted in some cases but unable to narrow down problem. No recall issued as of complaint dates. Some owners state dealer service department contacted manufacturer without resolution.
Sensor failures (cam position, throttle position, O2 sensors)
Multiple sensor failures reported, particularly cam position sensors and throttle position sensor. Owners cite repeated replacement of same sensors with recurring failure.
When: First occurrence around 3 months to 6 months after purchase; recurrence common within 6–12 months
Symptoms owners cite: Stalling and rough idle; Check engine light illumination; Hard or stalled shifting; Engine entering reduced power mode; Rough idling and shaking
Codes mentioned: P00013XX (cam position sensor codes), Sensor fault codes (not specified)
Repairs/costs cited: Cam position sensors replaced multiple times on same vehicle with recurring failure. Throttle position sensor replacement noted. O2 sensors replaced every time but codes do not clear. Dealership noted in one case that cam sensor needed changing again after 2 months.
Recalls/TSBs owners mention: Dealership performed recalls (owner notes recall should have fixed issue but did not). GM field engineer declared phone/infotainment system 'operated fine' in one case despite persistent issues; owner reports engineer made only 4-minute test call.
Excessive oil consumption
Engine burns or leaks oil at accelerated rates, requiring frequent top-ups between scheduled changes. One owner reports complete engine damage from oil starvation; another paid for engine replacement out of pocket.
When: Ongoing throughout ownership; at least one failure reported around 100k miles before recall expiration
Symptoms owners cite: Oil level drops rapidly between changes; Visible oil leaks underneath vehicle; Owner must add oil every 2–4 weeks despite recent change; Engine making noise attributed to low oil; Complete oil loss leading to engine shutdown (one report)
Repairs/costs cited: Oil changes performed every 3 months by one owner with continued consumption. One owner reports paying for complete engine replacement out of pocket when oil starvation damaged engine. Recall on oil consumption issue noted but expired for some owners.
Recalls/TSBs owners mention: Oil consumption recall mentioned; appears to have expired or not covered all vehicles in cluster.
Ignition and key system faults
Key release failure and starting issues where key becomes stuck in ignition or car fails to start. Requires multiple cycles to release key or start vehicle.
When: Ongoing problem reported by owners
Symptoms owners cite: Key will not release from ignition after parking; Car will not start on first attempt; Key requires multiple on/off cycles to release; Car requires multiple key cycles to start; In one case, vehicle lost all power with key stuck in ignition
Repairs/costs cited: Two different dealerships unable to duplicate despite occurring multiple times daily in one case. No permanent repair reported.
Recalls/TSBs owners mention: Dealerships unable to replicate; no fix applied.
Bluetooth and OnStar phone system static
Persistent static on Bluetooth and OnStar handsfree calls that worsens with vehicle speed. VCIM and microphone replaced twice with no lasting improvement.
When: Ongoing for 1.5 years reported in one complaint; progressive worsening over months
Symptoms owners cite: Static on Bluetooth calls; Static on OnStar calls; Static worsens as speed increases; nearly unusable at 70 mph; System operates static-free when vehicle is stationary; Caller on other end unable to hear person in vehicle clearly at highway speeds
Repairs/costs cited: Owner changed phones at least 4 times. VCIM (Wireless Control Module) and microphone replaced twice at dealership. Owner spent 'countless hundreds of dollars' on different phones.
Recalls/TSBs owners mention: GM customer service declared issue 'technology issue' and not their responsibility after 36k miles (end of bumper-to-bumper warranty). GM field engineer tested for less than 4 minutes, declared system 'operated fine,' but put 86 miles on vehicle and left it out of gas. GM refuses to work on issue after that determination.
Dashboard electrical short from sunroof water intrusion
Internal seal failure on sunroof allowed water to leak unobserved into vehicle body, flowing into dashboard and control panel where it shorted electrical components.
When: Timing not specified in narrative
Symptoms owners cite: Turn signal indicator eliminated; Radio and amplifier malfunction at maximum volume; General alarm system at maximum volume; Risk of airbag deployment due to water damage (did not occur in this case)
Repairs/costs cited: Interior of car removed and replaced; major components behind dashboard replaced. Airbags not replaced. Water traced to sunroof internal seal failure.
HVAC actuator/recirculation door noise
Tapping noise from behind mid-dash HVAC control unit when radio is turned on or defrost mode activated. Owner believes air recirculation door actuator activating unintentionally.
When: Ongoing; happens every time radio turned on or cold defrost engaged
Symptoms owners cite: Repetitive tap-tap-tap-tap noise from behind radio/HVAC control unit; Noise occurs when turning on radio with ignition off; Noise occurs when engaging defrost mode without A/C; Occurs at any speed or with no key in ignition; Owner suspects design defect in air recirculation door
Repairs/costs cited: Owner notes diagnosis and repair would require dashboard removal.
Transmission failure
Torque converter failure requiring replacement. Transmission issue not typical of earlier reported stalling (which is engine-related).
When: Around 120k miles
Symptoms owners cite: Transmission failure with no warning
Repairs/costs cited: Torque converter replacement cost approximately $3,500.
Automatic liftgate malfunction
Power liftgate opens, reaches top, then automatically closes halfway, pops back open to top, and fully closes—does not detect obstruction. Related models (Enclave, Traverse, Acadia, Outlook) have recalls for same issue; Terrain does not.
When: Ongoing issue
Symptoms owners cite: Liftgate closes automatically before reaching full open; Liftgate pops back open partway through closing; No obstruction detection; Erratic closing sequence
Recalls/TSBs owners mention: No recall issued for Terrain; related GM models (Enclave, Traverse, Acadia, Outlook) are under recall for same issue.
Electrical fire hazard
Vehicle caught fire due to unspecified electrical issue. Reported as single incident but raises serious safety concern.
When: Timing not specified
Symptoms owners cite: Vehicle caught fire
Complete vehicle loss of power and immobilization
Vehicle loses all electrical power, preventing starting and locking, with keys stuck in ignition. Mechanic diagnosed as 'computer failure' (vehicle computer not communicating). No successful repair identified.
When: After warranty expiration; at 89k miles reported in one case
Symptoms owners cite: Vehicle dies abruptly without warning; Complete loss of electrical power; Keys become stuck in ignition; Vehicle cannot be unlocked or started; Recurring every few weeks in one case
Repairs/costs cited: Mechanic spent $400 to diagnose 'computer failure' (vehicle computer not communicating to vehicle to 'work'). No repair solution found. AAA and independent mechanic tested battery multiple times; battery was not cause.
Interior lighting failures (shift indicator, wipers, defroster)
Intermittent failure of interior lighting, shift indicator, wipers, and defroster controls both at start and while driving.
When: Reported after timing chain replacement at 51k miles; ongoing
Symptoms owners cite: Shift indicator light not working; Interior lighting intermittent; Wiper controls not responding; Defroster not responding; Failures occur at startup and while driving
Repairs/costs cited: Owner notes not recalled and out of warranty.
Recalls/TSBs owners mention: GMC dealer stated not recalled and out of warranty.
Rear passenger light electrical fault
Recurring electrical shortage in rear passenger lights requiring repeated bulb replacement but issue persists.
When: Ongoing
Symptoms owners cite: Rear passenger lights not working; Bulbs burned out repeatedly; Electrical short suspected
Repairs/costs cited: Owner changed bulbs several times.
A/C compressor and condenser failure
Compressor and condenser require replacement. A/C had freon leak requiring recharge previous year.
When: 5 years after purchase
Symptoms owners cite: A/C not functioning; Freon leak (previous year); Compressor failure
Repairs/costs cited: Freon added one year prior; compressor and condenser replacement needed 5 years into ownership.
Steering lock engagement preventing vehicle start
Steering wheel locks up and cannot be released, preventing vehicle from starting. Issue persists across multiple key fob replacements, suggesting deeper electrical/security system problem.
When: Reported when key is 10+ years old; ongoing issue
Symptoms owners cite: Steering wheel locks and cannot be unlocked; Vehicle will not start when steering locked; Very difficult to unlock steering manually; Issue persists even after ordering new key fob
Repairs/costs cited: Owner ordered new key fob (cost not specified) but GM parts indicates GM has not sent replacement (5+ weeks delay noted).
Synthesized from 23 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 2011 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 2011 GMC Terrain?
It's a documented issue but not catastrophic. 23 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 17 complaints that reported odometer mileage, most electrical failures cluster between 50,000 and 130,000 miles, with the median around 89,000. A quarter of owners report trouble before 50,000; a quarter make it past 130,000. 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/2011/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.