2017 GMC Sierra 2500 HD Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2017 GMC Sierra 2500 HD and How to Fix Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
80% chance it's the
Oil System Components
0%
20% chance it's the
Engine Gaskets
The most common reasons a 2017 GMC Sierra 2500 HD is leaking oil are oil system component failure and leaking engine gaskets.
  • Oil System Components: A worn or damaged oil pump or filter can lead to low oil pressure, resulting in inadequate lubrication and potential engine damage.
  • Engine Gaskets: A worn or damaged engine gasket can lead to oil or coolant leaks, resulting in engine overheating or loss of lubrication.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2017 GMC Sierra 2500 HD is leaking oil?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Oil pans don't wear out or break like other parts, they generally only need to be replaced because of external damage from an accident or an improperly tightened drain plug. The main symptom you will experience is an oil leak underneath the engine of your car. The oil that leaks from a damaged oil pan will range from dark brown to dark black. If the leak is large enough or occurs for long enough the oil level will be low enough to turn the oil pressure or low oil level warning light on.

An oil leak may be noted on the ground where the vehicle is parked. However, many vehicles have plastic trays underneath the engine that may catch leaking oil and conceal the leak. In such cases, a low oil level, a burning oil smell, or even smoke from oil burning in the engine bay may be noted.

»MORE: Signs of a bad oil pan gasket

A bad oil level sensor may cause a false reading of the engine oil level. The oil level warning light may illuminate even when the oil level (checked manually) is within an acceptable range. The warning light may also come on and off intermittently if the sensor is faulty. An error code may be sent to the PCM and a check engine light may come on the dashboard as well if the sensor is bad.

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

What are the steps to diagnose and fix an oil leak in a 2017 GMC Sierra 2500 HD?

To effectively diagnose and fix an oil leak in your 2017 GMC Sierra 2500 HD, start by identifying the source of the leak. Begin by inspecting the undercarriage of the vehicle, paying close attention to common leak points such as the oil pan, oil filter, and valve cover gaskets. Once you have pinpointed the leak, check the oil levels to confirm that they are within the recommended range, as low oil levels can indicate a significant leak that requires immediate attention. Next, examine the gaskets and seals for any signs of wear or damage; replacing faulty components is crucial to preventing future leaks. Additionally, ensure that all fasteners related to the oil system are properly tightened, as loose bolts can contribute to leaks. If you discover any damaged parts, such as the oil pan or filter, consider replacing them to resolve the issue. After making repairs, clean the engine area to facilitate monitoring for any new leaks, and keep an eye on oil levels to ensure that the problem has been fully addressed. By following this structured diagnostic approach, you can effectively manage and repair oil leaks, ensuring the longevity and performance of your vehicle.

What are the common causes of oil leaks in a 2017 GMC Sierra 2500 HD?

When dealing with oil leaks in a 2017 GMC Sierra 2500 HD, it's crucial to understand the common culprits that may be at play. One frequent issue is a worn or damaged oil pan gasket, which can deteriorate over time and lead to significant leaks. Additionally, valve cover gaskets are another common source of leaks, as they can also wear out and fail to create a proper seal. The oil filter housing gasket is yet another potential problem area; if this gasket fails, it can result in oil escaping from the housing. Furthermore, the rear main seal, located at the back of the engine, is known to develop leaks as the vehicle ages. Lastly, oil cooler line leaks can occur, particularly in older models, where the lines transporting oil to and from the cooler may corrode or become loose. Addressing these issues promptly is essential not only for maintaining engine performance but also for preventing further damage. Regular inspections and maintenance can help you catch these leaks early, ensuring your GMC Sierra remains in optimal condition.

How urgent is it to address the oil leak in a 2017 GMC Sierra 2500 HD?

Addressing an oil leak in your 2017 GMC Sierra 2500 HD should be a priority, as the severity of the leak can significantly impact your vehicle's performance and safety. A minor leak may seem manageable, but even small issues can escalate quickly, leading to major engine damage if not resolved. Oil plays a crucial role in lubricating engine components and preventing overheating; thus, neglecting a leak can result in increased friction and potential engine failure. Additionally, oil leaks pose environmental risks, as they can contaminate soil and water sources, making prompt repairs essential not only for your vehicle but also for the environment. Furthermore, oil spills can create hazardous driving conditions, increasing the likelihood of accidents. Therefore, regardless of the leak's initial severity, it is advisable to address any oil leak promptly to safeguard your engine, protect the environment, and ensure safe driving conditions.

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