2017 GMC Sierra 1500 Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2017 GMC Sierra 1500 and How to Fix 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 Sierra 1500 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 1500 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 steps should I take to diagnose the oil leak in my 2017 GMC Sierra 1500?

To effectively diagnose an oil leak in your 2017 GMC Sierra 1500, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by locating the leak; inspect the ground beneath your vehicle for any visible oil spots, which can help you pinpoint the source. Next, examine the oil pan for cracks or damage, as this is a common area for leaks. Ensure that the oil filter is securely installed and not the culprit, followed by checking the oil drain plug for tightness and any signs of a damaged gasket. The valve cover gasket is another frequent source of leaks, so inspect it for oil residue. Additionally, look at the oil cooler lines and the oil pressure sensor for any signs of leakage. Throughout this process, monitor your oil levels closely; a significant drop can indicate an ongoing issue. By following this methodical approach, you can effectively identify the source of the oil leak and take the necessary steps to resolve it.

What are the common causes of oil leaks in a 2017 GMC Sierra 1500?

When diagnosing oil leaks in a 2017 GMC Sierra 1500, 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 oil loss. Similarly, valve cover gaskets are prone to wear, and their failure can result in oil escaping from the engine, creating a mess and potential engine damage. Another area to inspect is the oil filter housing gasket; if this component fails, it can cause oil to leak from the connection point between the oil filter and the engine. Additionally, the rear main seal, located at the back of the engine, is another common source of leaks, as it can wear out and allow oil to seep out. Lastly, don't overlook the oil cooler lines, which can develop leaks due to age and wear. Addressing these issues promptly is essential for maintaining engine health, and regular inspections can help you catch these problems early, ensuring your GMC Sierra 1500 runs smoothly and efficiently.

How urgent is it to address the oil leak in a 2017 GMC Sierra 1500?

Addressing an oil leak in your 2017 GMC Sierra 1500 is not just a matter of routine maintenance; it is a pressing concern that requires immediate attention. Oil is vital for lubricating engine components, and a leak can lead to a significant loss of oil, which in turn can cause severe engine damage due to inadequate lubrication. Moreover, the presence of leaking oil creates a fire hazard, especially if it comes into contact with hot engine parts, posing a serious safety risk. Ignoring the leak can exacerbate the problem, leading to more extensive and costly repairs down the line. Therefore, it is crucial to act swiftly and address any signs of an oil leak to ensure the longevity of your vehicle and maintain safe driving conditions.

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