2021 INFINITI Q50 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2021 INFINITI Q50

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2021 INFINITI Q50 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty or malfunctioning sensor can lead to incorrect readings, causing issues with engine performance or other systems relying on accurate data.
  • Control Module: A faulty control module can lead to erratic vehicle behavior or failure of various electronic systems due to improper signal processing.
  • Throttle: A faulty throttle body or a defective accelerator pedal position sensor may be causing inconsistent throttle response.
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 2021 INFINITI Q50 cruise control isn't working?

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.

When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.

In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.

What are the initial diagnostic steps to take when the cruise control isn't working on a 2021 INFINITI Q50?

When faced with a malfunctioning cruise control system in your 2021 INFINITI Q50, it's essential to approach the diagnosis methodically. Begin by checking the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control buttons on the steering wheel; ensure they are responsive and not stuck, as this can also hinder operation. Following this, verify the speed sensor's performance, since a faulty sensor may prevent the cruise control from engaging properly. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, ensure that your brake lights are functioning correctly, as a malfunctioning brake light switch can interfere with cruise control activation. Finally, take a moment to inspect the wiring connections associated with the cruise control system for any loose or damaged wires. By systematically addressing these areas, you can effectively identify and resolve the common issues that may be affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2021 INFINITI Q50?

When the cruise control in your 2021 INFINITI Q50 stops functioning, it can be frustrating, but understanding the common problems can help you diagnose the issue. One frequent culprit is a faulty brake pedal switch, which can prevent the system from engaging or disengaging correctly. Additionally, issues with the speed sensor can lead to inaccurate speed readings, causing the cruise control to malfunction. A blown fuse in the cruise control system is another simple yet often overlooked problem that can disrupt its operation. Furthermore, a malfunctioning throttle actuator may hinder the system's ability to maintain the desired speed. Lastly, faults in the Electronic Control Module (ECM) can interfere with communication between the cruise control and other vehicle components, leading to failure. By being aware of these potential issues, you can take the first steps toward troubleshooting and possibly resolving the problem yourself before seeking professional help.

How urgent is it to address the malfunctioning cruise control in a 2021 INFINITI Q50?

Addressing a malfunctioning cruise control system in your 2021 INFINITI Q50 is crucial for both safety and vehicle performance. When cruise control fails, it can lead to unpredictable acceleration or deceleration, significantly increasing the risk of accidents on the road. Ignoring these symptoms not only jeopardizes your safety but can also result in more severe issues down the line, potentially leading to costly repairs as other vehicle components may be affected. Moreover, a properly functioning cruise control system enhances your driving experience by providing comfort and convenience during long trips. Therefore, it is essential to prioritize the repair of your cruise control system to ensure a safe driving environment, prevent further damage, and maintain the overall enjoyment of your vehicle.

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