2012 Volvo XC90 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2012 Volvo XC90 and How to Resolve Them

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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 2012 Volvo XC90 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 2012 Volvo XC90 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.

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.

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 steps to diagnose a rough idle in a 2012 Volvo XC90?

To effectively diagnose a rough idle in your 2012 Volvo XC90, start with the simplest checks to rule out common issues. Begin by inspecting the coolant temperature sensor, as a malfunctioning sensor can significantly impact engine performance and idle stability. Next, examine the idle air control system, particularly if you encounter a P0505 error code, which indicates potential problems in this area. Pay attention to the engine RPMs; if they are higher than normal during idle, it may signal underlying issues such as engine sputtering or stalling. Additionally, consider the condition of the instrument cluster, as any faults here could also affect idle performance. Finally, investigate common culprits like defective spark plugs, ignition system failures, blown head gaskets, idle valve control issues, and vacuum pipe leaks. By following this diagnostic approach, you can systematically identify and address the root causes of rough idling, ensuring a smoother driving experience.

What are the common problems that could cause a rough idle in a 2012 Volvo XC90?

When dealing with a rough idle in a 2012 Volvo XC90, it's essential to consider several common problems that could be affecting your vehicle's performance. One of the primary culprits is the crankshaft position sensor, which, if faulty, can cause irregular RPM fluctuations and vibrations during idle. This sensor plays a crucial role in engine timing, and its failure can lead to a rough running engine. Another potential issue is the coolant temperature sensor; if this sensor malfunctions, it may send incorrect data to the Engine Control Unit (ECU), resulting in a rough idle and even engine stalling. Additionally, if your XC90 exhibits rough idle symptoms but seems to run fine otherwise, the problem might stem from the instrument cluster. In such cases, checking the fuse and using a Volvo scanner to read fault codes can help pinpoint the issue. By systematically addressing these common problems, you can effectively troubleshoot and resolve the rough idle in your Volvo XC90, making it a rewarding DIY project.

How urgent is it to address the rough idle in a 2012 Volvo XC90?

Addressing a rough idle in your 2012 Volvo XC90 is crucial for maintaining the vehicle's performance and safety. Ignoring this symptom can lead to a cascade of problems, including decreased fuel efficiency and more severe engine damage over time. A rough idle often signals underlying issues, such as a malfunctioning knock sensor or a defective oil control valve, which, if left unchecked, could escalate into costly repairs. Moreover, a rough idle can affect drivability, making your vehicle less responsive and potentially unsafe on the road. By tackling this issue promptly, you not only enhance your vehicle's efficiency but also prevent further complications that could compromise its overall health. Therefore, if you notice a rough idle, it’s essential to investigate and address the problem as soon as possible to ensure your Volvo XC90 runs smoothly and reliably.

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