Volvo 960 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Volvo 960 and How to Fix Them

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Volvo 960 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 Volvo 960 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 throttle position sensor fails, the engine's computer tends to overcompensate with fuel, leading black exhaust coming from the tailpipe. There is a strong possibility of engine misfires, and the check engine light will come on.

Throttle position sensors can also develop "dead spots," or certain places along the throttle curve where it doesn't get a reading. When this happens, the above symptoms can occur but then stop when you further press or let off the gas pedal.

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.

Troubleshooting Cruise Control Issues in a Volvo 960

When troubleshooting cruise control issues in a Volvo 960, it's essential to adopt a methodical diagnostic approach that begins with the simplest potential fixes before progressing to more complex components. Start by checking the control module, as this is a common source of malfunction; ensure it is properly connected and functioning. Next, inspect the cruise control sensor, as any faults here can disrupt the system's operation. Following this, examine the throttle to confirm it is operating smoothly, as any restrictions can affect cruise control performance. Don’t forget to verify the fuse associated with the cruise control system; a blown fuse can easily lead to a complete failure of the system. Additionally, test the brake switch, since issues with this component can cause the cruise control to disengage unexpectedly. Lastly, familiarize yourself with the vacuum system, as it plays a crucial role in the cruise control's functionality. By systematically addressing these components, you can effectively diagnose and potentially resolve cruise control issues in your Volvo 960, making your DIY troubleshooting efforts more efficient and successful.

What Are the Common Causes of Cruise Control Malfunction in a Volvo 960?

When diagnosing cruise control malfunctions in a Volvo 960, it's essential to consider several common problems that may be at play. One of the primary culprits is the control module, which can experience failures that disrupt the cruise control system's functionality. Additionally, sensor issues are frequently reported, as faulty sensors can prevent the cruise control from engaging or cause it to disengage unexpectedly. Throttle-related problems are another significant factor; if the throttle system is not operating correctly, it can directly impact the cruise control's performance. Owners have also noted specific scenarios, such as the cruise control failing to work after an engine replacement or intermittently disengaging despite a functioning brake switch. Addressing these issues promptly is crucial for restoring the cruise control system's reliability, making it important for DIY enthusiasts to familiarize themselves with these potential failure modes.

Why is the Cruise Control Not Working in a Volvo 960?

When your Volvo 960's cruise control fails, it’s crucial to understand the underlying issues and the urgency of addressing them. Problems can stem from the control module, sensors, or throttle, which may lead to erratic behavior or complete failure of the system. Additionally, the cruise control may disengage unexpectedly during challenging driving conditions, such as steep inclines or wheel spin, which can compromise your safety on the road. If the system intermittently disengages and refuses to reengage, this could indicate a malfunctioning brake switch, a critical component that ensures the cruise control operates safely. Furthermore, if you've recently replaced the engine, compatibility issues or overlooked fuse checks could also be the culprits behind the malfunction. Ignoring these symptoms not only poses a risk to your driving safety but can also lead to more significant mechanical issues down the line. Therefore, diagnosing the specific cause of the cruise control malfunction promptly is essential for both your safety and the longevity of your vehicle.

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