2017 GMC Yukon XL Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2017 GMC Yukon XL and How to Address Them Effectively

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Reviewed by
Aisha
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 Yukon XL 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 Yukon XL 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 the oil leak in a 2017 GMC Yukon XL?

When diagnosing an oil leak in your 2017 GMC Yukon XL, start with a systematic approach to identify the source of the problem. Begin by locating any visible signs of oil on the ground beneath your vehicle, as this can provide immediate clues. Next, inspect the oil pan for cracks or loose bolts, as these are common culprits for leaks. Don’t overlook the oil filter; ensure it is properly installed and free from leaks. The oil drain plug should also be checked for tightness, as a loose plug can lead to significant oil loss. Additionally, examine the gaskets and seals around the engine components, such as the valve cover and oil pan gaskets, for any signs of wear or damage. Look for oil splatters on engine parts, which can help pinpoint the leak's origin. Finally, monitor your oil levels regularly to assess the rate of loss, which can further assist in diagnosing the issue. By following these steps, you can effectively troubleshoot and address the oil leak in your vehicle.

What are the common causes of oil leaks in a 2017 GMC Yukon XL?

When dealing with oil leaks in a 2017 GMC Yukon XL, 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 oil leaks; as they age, they can lose their sealing ability, allowing oil to escape. Another area to inspect is the oil filter housing gasket, which can fail and result in oil seeping out. The rear main seal, located at the back of the engine, is also prone to leaks, and if it fails, it can cause oil to escape from the engine. Lastly, oil cooler lines can develop leaks due to wear and tear, contributing to oil loss. Addressing these issues promptly is essential to prevent further engine damage and maintain optimal vehicle performance. Regular inspections and maintenance can help you catch these problems early, ensuring your Yukon XL runs smoothly.

How urgent is it to address the oil leak in a 2017 GMC Yukon XL?

Addressing an oil leak in your 2017 GMC Yukon XL is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises the engine's lubrication system. This lack of lubrication increases friction among engine components, potentially resulting in severe wear and tear or even catastrophic engine failure. Moreover, the presence of leaking oil poses a serious fire hazard, especially if it comes into contact with hot engine parts, creating a risk that could endanger both the vehicle and its occupants. Additionally, neglecting this issue can have environmental repercussions, as spilled oil can seep into the ground and contaminate local water sources. Therefore, if you notice any signs of an oil leak, it is crucial to act swiftly to mitigate these risks and ensure the longevity and safety of your vehicle.

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