2019 GMC Sierra 2500 HD Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2019 GMC Sierra 2500 HD and How to Address 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 2019 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 2019 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 initial steps to diagnose an oil leak in a 2019 GMC Sierra 2500 HD?

To effectively diagnose an oil leak in your 2019 GMC Sierra 2500 HD, start by locating the leak, which often involves checking underneath the vehicle for any visible oil drips or pools. Once you have a general idea of where the leak might be originating, inspect the engine compartment for oil stains or wet areas on the engine block, hoses, and gaskets. It's also crucial to check the oil level using the dipstick; a significant drop in oil level can indicate a serious leak. Pay special attention to the oil filter and drain plug, ensuring they are properly tightened and free from damage, as these are common culprits for leaks. Additionally, examine the gaskets and seals for any signs of wear, as faulty gaskets can frequently lead to oil leaks. If the source remains elusive, consider performing a pressure test, which can help identify leaks that are not immediately visible. By following these steps, you can systematically diagnose the oil leak and take appropriate action to resolve the issue.

What are the common causes of oil leaks in a 2019 GMC Sierra 2500 HD?

When dealing with oil leaks in a 2019 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 leaks. Additionally, valve cover gaskets are another common source of leaks, as they can wear out and allow oil to escape from the top of the engine. The oil filter housing gasket is also a potential problem area; if it fails, you may notice oil leaking near the oil filter. Another significant concern is the rear main seal, located at the back of the engine, which can develop leaks and cause oil to drip onto the ground. Lastly, don’t overlook the oil cooler lines, as leaks in these lines can contribute to oil loss as well. Addressing these issues promptly is essential to prevent further engine damage and maintain optimal vehicle performance, making regular inspections and maintenance a vital part of vehicle care.

How urgent is it to address the oil leak in a 2019 GMC Sierra 2500 HD?

Addressing an oil leak in your 2019 GMC Sierra 2500 HD is not just a matter of routine maintenance; it is a pressing concern that requires immediate attention. An oil leak can significantly reduce oil levels, leading to inadequate lubrication of engine components, which may result in severe engine damage over time. Furthermore, neglecting this issue can cause the engine to overheat, as the lack of proper lubrication prevents it from functioning efficiently, potentially leading to costly repairs. The safety risks associated with oil leaks cannot be overlooked either; leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. By addressing the oil leak promptly, you not only protect your engine from further damage but also ensure that your vehicle operates safely and efficiently. Therefore, if you notice any signs of an oil leak, it is crucial to take action immediately to avoid serious complications down the road.

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