2018 GMC Canyon Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2018 GMC Canyon and How to Fix Them Effectively

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Reviewed by
Devin Cabugcal
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 2018 GMC Canyon 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 2018 GMC Canyon 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.

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 2018 GMC Canyon?

To effectively diagnose an oil leak in your 2018 GMC Canyon, 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. Once you have a general area, examine the oil pan for cracks or damage, as this is a common culprit. Next, check the oil filter to ensure it is securely installed and not leaking. The oil drain plug should also be inspected for tightness, as a loose plug can lead to significant oil loss. Moving on, assess the valve cover gasket for wear or damage, as this can often be a source of leaks. Additionally, inspect the oil cooler lines for any signs of leaks or deterioration. Don’t forget to verify the functionality of the oil pressure sensor, as a malfunctioning sensor can contribute to oil loss. Finally, keep an eye on your oil levels over time; a noticeable drop can indicate a leak that needs immediate attention. By following this structured diagnostic approach, you can efficiently identify and address the oil leak in your GMC Canyon.

What are the common causes of oil leaks in a 2018 GMC Canyon?

When dealing with oil leaks in a 2018 GMC Canyon, 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, a faulty or improperly installed oil filter can also result in oil escaping, making it essential to ensure that this component is correctly fitted. Another area to inspect is the valve cover gasket, as wear and tear can cause it to fail, leading to leaks. It's also important to check the oil drain plug; if it's loose or damaged, it can be a source of oil loss. Lastly, a leak from the rear main seal is another common problem that can affect this model. Addressing these issues promptly is vital to maintaining engine health and performance, and regular inspections can help catch these problems early, allowing DIY enthusiasts to take action before they escalate.

How urgent is it to address the oil leak in my 2018 GMC Canyon?

Addressing an oil leak in your 2018 GMC Canyon is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. Ignoring an oil leak can lead to severe engine damage due to inadequate lubrication, which is essential for the smooth operation of your vehicle. Additionally, the presence of leaking oil poses a significant safety risk, as it can drip onto hot engine components, increasing the likelihood of a fire. Beyond personal safety, neglecting this issue can have environmental repercussions, as spilled oil can contaminate soil and water sources. Furthermore, delaying repairs can escalate the problem, leading to more extensive damage and ultimately higher repair costs. Therefore, it is crucial to act swiftly and address any signs of an oil leak to protect both your vehicle's performance and your safety on the road.

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2018 GMC Canyon Oil Leak Causes & Diagnosis | RepairPal