2014 GMC Sierra K15 — Full Specifications
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The 2014 GMC Sierra K15 is a pickup offered with 3 engines (4.3L 6-cyl, 5.3L 8-cyl, 6.2L 8-cyl). Its most fuel-efficient configuration returns around 23 mpg (UK) / 19 mpg (US EPA) combined, with 20–23 mpg (UK) across all configurations. Owners often keep a GMC Sierra K15 workshop manual to hand for servicing and repairs.
Related listing: see also the 2014 GMC Sierra page for the base Sierra listing, which may cover additional engines and body styles.
Compared with the 2013 GMC Sierra K15: Fuel economy improves from 20 to 23 mpg (UK) combined on the most efficient configuration. No longer listed: 4.8L 8-cyl. The overall NHTSA rating moves from 4★ to 5★.
Full Specifications
| Engine (most efficient) | 4.3L 6-cyl |
|---|---|
| Engine options | 4.3L 6-cyl · 5.3L 8-cyl · 6.2L 8-cyl |
| Transmission (most efficient) | Automatic 6-spd |
| Fuel Type | Regular Gasoline |
| Powertrain | Conventional |
| Drive | 4-Wheel Drive |
| Body Style | Pickup |
| Fuel Economy (UK) | 23 combined / 20 urban / 26 extra-urban mpg |
| Fuel Economy (US EPA) | 19 combined / 17 city / 22 highway mpg |
| CO₂ Emissions | 295 g/km |
| EPA Greenhouse Gas Score | 4 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $3,550 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 3 configurations for the 2014 GMC Sierra K15 across 3 engines (4.3L 6-cyl, 5.3L 8-cyl, 6.2L 8-cyl). Combined fuel economy ranges from 17 to 19 mpg (US), or 20 to 23 mpg (UK), depending on engine, transmission and drive. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 4.3L 6-cyl | Automatic 6-spd | 4-Wheel Drive | 23 | 19 (17/22) | 295 | $3,550 |
| 5.3L 8-cyl | Automatic 6-spd | 4-Wheel Drive | 22 | 18 (16/22) | 304 | $3,700 |
| 6.2L 8-cyl | Automatic 6-spd | 4-Wheel Drive | 20 | 17 (14/20) | 333 | $3,950 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
Owner Essentials for the 2014 GMC Sierra K15
Running Costs: 2014 GMC Sierra K15
Covering around 8,000 miles a year in a 2014 GMC Sierra K15 at 23 mpg combined, expect roughly 1,581 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $3,550 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Only need this car occasionally? See our buy vs rent comparison.
2014 GMC Sierra K15 Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists 9 safety recall campaigns that include the 2014 GMC Sierra K15 (as of 6 October 2026). Most affected areas: Seat belts (2), Service brakes (2), Air bags (2). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Seat belts — campaign 21V245000, reported 8 April 2021. Risk: A broken pretensioner cable reduces the effectiveness of the driver's seat belt, increasing the risk of injury.
- Service brakes — campaign 19V761000, reported 24 October 2019. Risk: Unintended activation of the driveline-protection system will cause unintended braking on the wheel on the opposite side of the failed sensor, causing the vehicle to pull to one side unexpectedly, increasing…
- Service brakes — campaign 19V645000, reported 6 September 2019. Risk: As the vacuum level drops, the brake assist decreases, increasing braking effort, extending the distance required to stop the vehicle, thereby increasing the risk of a crash.
- Equipment — campaign 18V267000, reported 26 April 2018. Risk: In the event of a fire, if the fire extinguisher does not function properly, it can increase the risk of injury.
Showing the 4 most recent of 9 campaigns.
Owners have filed 859 complaints with NHTSA about the 2014 GMC Sierra K15. The most-reported areas are Exterior lighting (212), Steering (162), Service brakes (143). Complaints include 29 reported crashes, 9 reported fires, 24 reported injuries, 1 reported death. That is well above the median of 304 complaints across the 9 GMC Sierra K15 model years in our data.
Used-buyer checklist for the 2014 GMC Sierra K15
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Lighting (212 owner complaints) — Check every exterior light works and look for moisture inside the lamp housings.
- Steering (162 owner complaints) — Check for play, noise or heavy steering, and ask whether any steering recall work was done.
- Brakes (2 recall campaigns · 143 owner complaints) — Brake firmly from speed and look for pulling, vibration or a soft pedal; ask for brake service history.
- Electrical system (138 owner complaints) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
Source: US NHTSA recall and consumer-complaint databases, retrieved 6 October 2026. Complaints are unverified owner reports, not confirmed defects. Check any vehicle by VIN at nhtsa.gov/recalls, and see our guide to checking a used car for recalls.
How It Compares
How does the GMC Sierra K15 compare to similar pickups? For context, pickups in our database average around 25 mpg (UK) combined — this model's 23 mpg figure is 2 mpg below that average. Its 295 g/km CO₂ figure is 12 g/km higher than the 283 g/km average for pickups on this site. This comparison is based on 264 pickups in our dataset.
GMC models in our database average about 26 mpg (UK) combined on their most efficient configuration; the 2014 GMC Sierra K15's 23 mpg is 3 mpg below that make average. Its 295 g/km CO₂ figure is 23 g/km higher than the 272 g/km GMC average.
Of the 9 GMC Sierra K15 model years we cover, the 2014 is the most economical on its best configuration (23 mpg UK combined). See every GMC Sierra K15 year side by side.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2014 GMC Sierra K15
Frequently Asked Questions
What engine does the 2014 GMC Sierra K15 have?
EPA lists 3 engines for the 2014 GMC Sierra K15: 4.3L 6-cyl, 5.3L 8-cyl, 6.2L 8-cyl. The most fuel-efficient configuration pairs the 4.3L 6-cyl with a automatic 6-spd.
What is the fuel economy of the 2014 GMC Sierra K15?
The most efficient configuration returns around 23 mpg (UK) combined, or 19 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 20 to 23 mpg.
How much does the 2014 GMC Sierra K15 cost to fuel per year?
The US EPA estimates about $3,550 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
Does the 2014 GMC Sierra K15 have a good safety rating?
It holds an overall NHTSA rating of 5 stars, with 5 stars for frontal crash protection.
Does the 2014 GMC Sierra K15 have any recalls?
NHTSA lists 9 safety recall campaigns that include the 2014 GMC Sierra K15 (as of 6 October 2026). Most affected areas: Seat belts (2), Service brakes (2), Air bags (2). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
What are the most common problems reported for the 2014 GMC Sierra K15?
Among the 859 owner complaints filed with NHTSA, the most-reported areas are Exterior lighting (212 complaints), Steering (162 complaints), Service brakes (143 complaints). Complaints are unverified owner reports, not confirmed defects, and raw counts rise with how many cars were sold.
Is the GMC Sierra K15's fuel economy good for a pickup?
It returns around 23 mpg (UK) combined, against a same-body-style average of roughly 25 mpg among the pickups we track.