2017 Cadillac XT5 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2017 Cadillac XT5 and How to Resolve Them

Find Repair Location
Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2017 Cadillac XT5 has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
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 Cadillac XT5 has rough idle?

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.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the potential causes and diagnostic steps for a rough idle in a 2017 Cadillac XT5?

When dealing with a rough idle in your 2017 Cadillac XT5, it's essential to adopt a systematic diagnostic approach that prioritizes simpler fixes before delving into more complex issues. Start by checking the air filter; a dirty or clogged filter can significantly restrict airflow to the engine, leading to performance problems. If the air filter appears clean, inspect the spark plugs next, as worn or faulty plugs can cause misfiring, which directly contributes to a rough idle. Following this, examine the vacuum system for any leaks, as these can disrupt the air-fuel mixture and further exacerbate idle issues. If these components are functioning correctly, turn your attention to the fuel system, checking for clogs in the fuel filter or injectors that could hinder fuel delivery. Finally, test the mass airflow sensor, as a malfunction here can lead to incorrect air readings, affecting engine performance. By methodically addressing these areas, you can effectively diagnose and resolve the rough idle in your Cadillac XT5.

What are the common causes of a rough idle in a 2017 Cadillac XT5?

When experiencing a rough idle in your 2017 Cadillac XT5, it's essential to consider several common issues that could be at play. One of the primary culprits is a dirty or clogged air filter, which can significantly restrict airflow to the engine, leading to performance problems. Additionally, faulty spark plugs are notorious for causing misfires, which can manifest as a rough idle. Another potential issue is vacuum leaks; these can disrupt the delicate balance of the air-fuel mixture, resulting in an unstable idle. Fuel system problems, such as a clogged fuel filter or a malfunctioning fuel pump, can also hinder engine performance and contribute to rough idling. Furthermore, a malfunctioning oxygen sensor can throw off the air-fuel ratio, exacerbating the issue. Lastly, don’t overlook the ignition system; components like faulty ignition coils or distributors can lead to similar symptoms. By regularly maintaining these systems and addressing any issues promptly, you can help ensure a smoother idle and overall better performance for your Cadillac XT5.

How urgent is it to address the rough idle in my 2017 Cadillac XT5?

Addressing a rough idle in your 2017 Cadillac XT5 is crucial for maintaining the vehicle's performance and longevity. Ignoring this symptom can lead to a cascade of issues, including decreased fuel efficiency and potential engine misfires, which may escalate into more severe engine damage over time. The rough idle could indicate underlying problems such as faulty spark plugs, fuel system malfunctions, or air intake issues that require immediate attention. By prioritizing timely repairs and regular maintenance, you not only enhance your vehicle's reliability but also avoid costly repairs in the future. Therefore, it is highly recommended to consult a professional mechanic at the first sign of a rough idle to ensure your Cadillac XT5 remains in peak condition and to safeguard against any safety risks associated with engine performance issues.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.