Likes
- Huge and extroverted presence, if that’s you’re thing.
- Immense hauling and towing capabilities
- Impressive towing cameras and vast range of available tech and features.
- Great variety of available models, including off-road-focused AT4
Used GMC Sierra 2500 review
2020 - 2023
Dislikes
- Many cabin pieces are obviously sourced from the less expensive Chevy Silverado 2500.
- Asks a premium in price in Australia and servicing can be a challenge.
- Questionable American build quality and access to spare parts.
- Can attract immense levels of negative attention, expect abuse.
Stuff you should know
- The GMC Sierra 2500HD is gaining popularity in Australia, especially in its premium AT4 and Denali trims. These higher-end versions offer a mix of luxury and off-road capability, catering to those looking for both status and comfort. Even the base model Sierra 2500HD strikes a balance between rugged utility and refinement, making it a solid choice for those needing serious hauling power without sacrificing comfort.
- Positioned as the middle sibling in the Sierra lineup, the 2500HD sits between the half-ton Sierra 1500 and the larger, more heavy-duty Sierra 3500HD. It provides an ideal option for those who need substantial towing and payload capabilities without the size of a truly enormous truck.
- The GMC Sierra 2500HD is available in five different body styles and offers two engine options: a 6.6L V8 petrol engine and a 6.6L Duramax turbo-diesel.
- The lineup also includes both pre- and post-2024 updates, along with eight different trim levels. The extensive list of options and equipment packages available makes the Sierra 2500HD one of the most customizable trucks in its segment, allowing buyers to tailor the vehicle to their specific needs.
- One of the standout features of the Sierra 2500HD is its spacious cabin, designed to comfortably accommodate both passengers and cargo. Whether you’re using it for work or leisure, the truck’s cabin offers plenty of room, ensuring comfort during long drives. This interior space is complemented by the truck’s exceptional hauling and towing capacities, typical of the heavy-duty truck class. For added convenience, the MultiPro tailgate offers a variety of configurations, making it easier to load and unload cargo.
- Despite its strengths, the GMC Sierra 2500HD does have some drawbacks. One of the biggest challenges for Australian buyers is the limited support network for GMC vehicles, which can make maintenance and servicing more difficult. Additionally, the ride quality can feel rough compared to other trucks in the segment, and visibility from the driver’s seat is somewhat limited. While the Sierra offers a range of technology, its in-cabin features fall short when compared to more tech-forward competitors in the segment.
- The current fourth generation of the GMC Sierra 2500HD was introduced in 2020, bringing a complete redesign that included updates to both technology and interior layout. With this redesign, the truck gained increased towing and hauling capacities, further solidifying its position in the heavy-duty market.
- The Sierra 2500HD shares its platform and dimensions with the Chevrolet Silverado 2500HD, offering roomy interiors, wide beds, and convenient built-in steps for accessing the cargo area. However, the Sierra sets itself apart with additional standard features and higher-quality interior materials, providing a more premium feel compared to its sibling.
- As with many American-made vehicles, there are ongoing concerns about the build quality and reliability of the GMC Sierra 2500HD. While the truck’s strong performance and capabilities are undeniable, buyers should be aware of potential long-term reliability issues that have historically affected some American brands. Understanding how the current generation holds up over time will be key for prospective buyers looking to invest in this heavy-duty truck, read on the learn more.
What goes wrong
Exterior
Rear Window
- Some owners have reported leaks from the rear window.
- While this issue can often be resolved with sealant, the necessity for a fix suggests a design or manufacturing oversight.
Daytime Running Lights
- Issues with daytime running lights burning out have been noted by a few owners.
- This may require the replacement of the light units or related components.
Mirrors
- The large mirrors on the Sierra 2500HD can shake, which might be attributed to their size or potential design flaws.
- There have been reports of electronic issues with the mirrors, including problems with actuators and lighting.
Lighting Issues
- If exterior lights flash intermittently every 10 seconds, owners should disconnect the truck’s batteries for a few minutes to reset the module.
- This often resolves the problem, but repeated occurrences might indicate a deeper issue.
Paint Quality
- Earlier models of the Sierra 2500HD experienced problems with paint chipping and marking easily
- This issue has been addressed in more recent models, which feature improved paint durability.
Interior
HVAC and Air Conditionin
- Problems with the HVAC system have been reported, particularly with the temperature and air delivery mode door actuators.
- Failure of these components can lead to expensive repairs, possibly requiring dashboard removal.
Electrical Gremlins
- Some owners have encountered sporadic electrical issues.
- It’s advisable to test all interior buttons and functions during a test drive to ensure everything operates correctly.
Speedometer and Gauges
- There have been reports of erratic behavior from the speedometer and other gauges.
- This issue can affect the accuracy of speed readings and other vital information.
Infotainment System
- Pre-2024 models of the Sierra 2500HD have been known to experience various issues with the infotainment system, including dropped phone connectivity (Apple CarPlay and Android Auto), screen glitches, freezing, or system failures.
- These problems are often resolved with software updates, though some owners have had to replace the entire infotainment system. The updated system has not been reported to have these issues.
Engines
6.6L Petrol V8 (L8T)
- The 6.6L petrol V8 engine features a robust cast iron block, enhancing durability.
- Some owners report occasional excessive oil consumption, though this issue is less prevalent compared to earlier 5.3L engines.
- As a direct injection engine, it is prone to carbon buildup, which can affect performance.
- It does not
Exterior
Rear Window
- Some owners have reported leaks from the rear window.
- While this issue can often be resolved with sealant, the necessity for a fix suggests a design or manufacturing oversight.
Daytime Running Lights
- Issues with daytime running lights burning out have been noted by a few owners.
- This may require the replacement of the light units or related components.
Mirrors
- The large mirrors on the Sierra 2500HD can shake, which might be attributed to their size or potential design flaws.
- There have been reports of electronic issues with the mirrors, including problems with actuators and lighting.
Lighting Issues
- If exterior lights flash intermittently every 10 seconds, owners should disconnect the truck’s batteries for a few minutes to reset the module.
- This often resolves the problem, but repeated occurrences might indicate a deeper issue.
Paint Quality
- Earlier models of the Sierra 2500HD experienced problems with paint chipping and marking easily
- This issue has been addressed in more recent models, which feature improved paint durability.
Interior
HVAC and Air Conditionin
- Problems with the HVAC system have been reported, particularly with the temperature and air delivery mode door actuators.
- Failure of these components can lead to expensive repairs, possibly requiring dashboard removal.
Electrical Gremlins
- Some owners have encountered sporadic electrical issues.
- It’s advisable to test all interior buttons and functions during a test drive to ensure everything operates correctly.
Speedometer and Gauges
- There have been reports of erratic behavior from the speedometer and other gauges.
- This issue can affect the accuracy of speed readings and other vital information.
Infotainment System
- Pre-2024 models of the Sierra 2500HD have been known to experience various issues with the infotainment system, including dropped phone connectivity (Apple CarPlay and Android Auto), screen glitches, freezing, or system failures.
- These problems are often resolved with software updates, though some owners have had to replace the entire infotainment system. The updated system has not been reported to have these issues.
Engines
6.6L Petrol V8 (L8T)
- The 6.6L petrol V8 engine features a robust cast iron block, enhancing durability.
- Some owners report occasional excessive oil consumption, though this issue is less prevalent compared to earlier 5.3L engines.
- As a direct injection engine, it is prone to carbon buildup, which can affect performance.
- It does not have Displacement On Demand technology, which helps avoid some reliability issues associated with older engines.
6.6L V8 Turbo Diesel (L5P)
- Issues such as rough idle and fuel consumption problems have been reported, leading to a recall for an ECU update.
- The global B electronics platform enables over-the-air updates but has led to problems where the truck becomes immobile during updates. This can be inconvenient given the truck’s large size.
- There have been electrical misfires due to poor injector connectors, which have been addressed by a recall.
- The MAP sensor often clogs, a common issue in modern diesels, primarily due to the EGR system. This clogging typically occurs after 20,000-30,000 km and is part of routine servicing.
- Crank pin failure and engine destruction have been reported but are not as widespread as some sources suggest. Problems often arise from improper installation of the harmonic balancer or front seal. This issue is more common in modified engines due to increased power demands.
Transmissions
Early 6-Speed Transmission
- Generally reliable if properly maintained, with regular servicing recommended.
- 10-Speed Transmission
- Co-developed by Ford and General Motors, not built by Allison as the badge might suggest.
- Some issues reported include problems with the valve body, oil pump, and clutch packs. Parts availability can be problematic, and service intervals are recommended every 40,000 km.
- Finding workshops equipped to service this heavy vehicle can be difficult in Australia.
Driving
- Some owners report harsh downshifts from 5th to 4th gear and occasional lurching when selecting park.
- Software updates or replacement of the transmission control module may resolve these issues, although some owners have had transmissions replaced under warranty.
Steering
- At certain angles, the steering can produce a clunking noise.
- This issue is often resolved with zip ties, according to recommendations from owner groups.
Adaptive Cruise Control
- The adaptive cruise control system can be overly aggressive in its calibration, affecting driving comfort.
General Driving Experience
In Australia, the Sierra 2500HD attracts significant attention, with reactions ranging from admiration to criticism. Despite its impressive capabilities, the truck can struggle with tight spaces, small roundabouts, and suburban streets. It is challenging to maneuver in metro areas and may not fit well in drive-throughs or tight parking spots, reflecting a contrast between its off-road prowess and urban practicality.
Exterior
Rear Window
- Some owners have reported leaks from the rear window.
- While this issue can often be resolved with sealant, the necessity for a fix suggests a design or manufacturing oversight.
Daytime Running Lights
- Issues with daytime running lights burning out have been noted by a few owners.
- This may require the replacement of the light units or related components.
Mirrors
- The large mirrors on the Sierra 2500HD can shake, which might be attributed to their size or potential design flaws.
- There have been reports of electronic issues with the mirrors, including problems with actuators and lighting.
Lighting Issues
- If exterior lights flash intermittently every 10 seconds, owners should disconnect the truck’s batteries for a few minutes to reset the module.
- This often resolves the problem, but repeated occurrences might indicate a deeper issue.
Paint Quality
- Earlier models of the Sierra 2500HD experienced problems with paint chipping and marking easily
- This issue has been addressed in more recent models, which feature improved paint durability.
Interior
HVAC and Air Conditionin
- Problems with the HVAC system have been reported, particularly with the temperature and air delivery mode door actuators.
- Failure of these components can lead to expensive repairs, possibly requiring dashboard removal.
Electrical Gremlins
- Some owners have encountered sporadic electrical issues.
- It’s advisable to test all interior buttons and functions during a test drive to ensure everything operates correctly.
Speedometer and Gauges
- There have been reports of erratic behavior from the speedometer and other gauges.
- This issue can affect the accuracy of speed readings and other vital information.
Infotainment System
- Pre-2024 models of the Sierra 2500HD have been known to experience various issues with the infotainment system, including dropped phone connectivity (Apple CarPlay and Android Auto), screen glitches, freezing, or system failures.
- These problems are often resolved with software updates, though some owners have had to replace the entire infotainment system. The updated system has not been reported to have these issues.
Engines
6.6L Petrol V8 (L8T)
- The 6.6L petrol V8 engine features a robust cast iron block, enhancing durability.
- Some owners report occasional excessive oil consumption, though this issue is less prevalent compared to earlier 5.3L engines.
- As a direct injection engine, it is prone to carbon buildup, which can affect performance.
- It does not have Displacement On Demand technology, which helps avoid some reliability issues associated with older engines.
6.6L V8 Turbo Diesel (L5P)
- Issues such as rough idle and fuel consumption problems have been reported, leading to a recall for an ECU update.
- The global B electronics platform enables over-the-air updates but has led to problems where the truck becomes immobile during updates. This can be inconvenient given the truck’s large size.
- There have been electrical misfires due to poor injector connectors, which have been addressed by a recall.
- The MAP sensor often clogs, a common issue in modern diesels, primarily due to the EGR system. This clogging typically occurs after 20,000-30,000 km and is part of routine servicing.
- Crank pin failure and engine destruction have been reported but are not as widespread as some sources suggest. Problems often arise from improper installation of the harmonic balancer or front seal. This issue is more common in modified engines due to increased power demands.
Transmissions
Early 6-Speed Transmission
- Generally reliable if properly maintained, with regular servicing recommended.
- 10-Speed Transmission
- Co-developed by Ford and General Motors, not built by Allison as the badge might suggest.
- Some issues reported include problems with the valve body, oil pump, and clutch packs. Parts availability can be problematic, and service intervals are recommended every 40,000 km.
- Finding workshops equipped to service this heavy vehicle can be difficult in Australia.
Driving
- Some owners report harsh downshifts from 5th to 4th gear and occasional lurching when selecting park.
- Software updates or replacement of the transmission control module may resolve these issues, although some owners have had transmissions replaced under warranty.
Steering
- At certain angles, the steering can produce a clunking noise.
- This issue is often resolved with zip ties, according to recommendations from owner groups.
Adaptive Cruise Control
- The adaptive cruise control system can be overly aggressive in its calibration, affecting driving comfort.
General Driving Experience
In Australia, the Sierra 2500HD attracts significant attention, with reactions ranging from admiration to criticism. Despite its impressive capabilities, the truck can struggle with tight spaces, small roundabouts, and suburban streets. It is challenging to maneuver in metro areas and may not fit well in drive-throughs or tight parking spots, reflecting a contrast between its off-road prowess and urban practicality.
Should you buy it?
Should you buy a GMC Sierra 2500 HD? If you genuinely need the towing capacity, load capability, space, and comfort all in one vehicle—and you’ve found one with a flawless history, plus all the import documentation and conversion requirements check out—then absolutely, go for it. Really, only a RAM or Silverado can match what the GMC offers, and each has its own pros and cons.
Even if you have no intention of using it for its designed purpose and you’re buying it for the novelty factor or just because it makes you feel good, sure, why not?
However, if you’re buying it purely because you want people to notice you and you’re fine admitting that, yes, people will definitely look at you in a 2500. But just be aware, it’s probably not because they think you’re cool—they’ll most likely think you’re a wanker.
Should you buy a GMC Sierra 2500 HD? If you genuinely need the towing capacity, load capability, space, and comfort all in one vehicle—and you’ve found one with a flawless history, plus all the import documentation and conversion requirements check out—then absolutely, go for it. Really, only a RAM or Silverado can match what the GMC offers, and each has its own pros and cons.
Even if you have no intention of using it for its designed purpose and you’re buying it for the novelty factor or just because it makes you feel good, sure, why not?
However, if you’re buying it purely because you want people to notice you and you’re fine admitting that, yes, people will definitely look at you in a 2500. But just be aware, it’s probably not because they think you’re cool—they’ll most likely think you’re a wanker.
Should you buy it?
Should you buy a GMC Sierra 2500 HD? If you genuinely need the towing capacity, load capability, space, and comfort all in one vehicle—and you’ve found one with a flawless history, plus all the import documentation and conversion requirements check out—then absolutely, go for it. Really, only a RAM or Silverado can match what the GMC offers, and each has its own pros and cons.
Even if you have no intention of using it for its designed purpose and you’re buying it for the novelty factor or just because it makes you feel good, sure, why not?
However, if you’re buying it purely because you want people to notice you and you’re fine admitting that, yes, people will definitely look at you in a 2500. But just be aware, it’s probably not because they think you’re cool—they’ll most likely think you’re a wanker.
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Disclaimer
Please note that pricing information is subject to fluctuations in the automotive market.
Information correct as of Sep 15, 2024.
The advice provided on this website is general advice only. It has been prepared without taking into account your objectives, financial situation or needs. Before acting on this advice, you should consider the appropriateness of the advice, having regard to your own objectives, financial situation and needs.
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