2020 F150 Cruise Control Not Working: Diagnosed & Fixed
Root Causes of 2020 F150 Cruise Control Not Working
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Is your 2020 F-150 suddenly refusing to maintain highway speed, leaving you with a dead cruise control button? Whether it’s a simple blown fuse or a complex radar alignment issue, an inactive cruise system is more than an annoyance—it’s often a symptom of underlying electronic trouble. Cruise control, especially its adaptive variants, is a sophisticated safety-critical system that relies on constant communication between multiple modules. In this guide, we will walk through the diagnostic steps to identify exactly why your system is failing and how to get it back on track.
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Start 6 Months FreeDashboard Warning Lights and System Interdependence
The modern cruise control system in your 2020 F-150 is intricately linked with other vital vehicle functions, most notably the Anti-lock Braking System (ABS) and Electronic Stability Control (ESC). This integration is a safety feature: if the powertrain control module (PCM) detects a fault in the ABS or ESC systems, it will automatically disable cruise control to prevent unexpected behavior. For instance, research indicates that an ABS sensor failure is the most common reason for a complete cruise control lockout. If a wheel speed sensor is providing erratic data or is non-responsive, the PCM interprets this as a critical system fault and disengages cruise control functionality. The dashboard is your first indicator; a flashing ABS, traction control, or brake warning light often accompanies a non-functional cruise control. This interdependence means that a problem seemingly unrelated to speed control can be the direct culprit.
CAN-bus Communication and Module Faults
At the heart of your F-150’s electronic systems is the Controller Area Network (CAN-bus). This network allows various electronic control units (ECUs), including the PCM, ABS module, and Body Control Module (BCM), to communicate with each other. If there’s a communication breakdown or a fault within any of these modules, it can directly impact the cruise control’s operation. The CAN-bus relays diagnostic trouble codes (DTCs) that pinpoint the source of the issue. For example, a faulty communication message between the steering wheel control module and the PCM can prevent cruise control from engaging. Identifying these communication errors requires a diagnostic scan tool capable of reading all modules on the CAN-bus, not just the engine codes.
Adaptive Cruise Radar Sensor Vulnerabilities
For models equipped with Adaptive Cruise Control (ACC), the forward-facing radar sensor is a critical component. This sensor, typically located behind the grille or the Ford emblem, is responsible for detecting vehicles ahead and maintaining a set following distance. Physical damage to this sensor, often from minor front-end impacts, road debris, or even improper cleaning, can render the ACC system inoperable. Furthermore, issues such as mis-alignment due to suspension work or impacts, or obstructions like heavy mud, snow, or ice, will trigger the system to disable itself. When the PCM receives erroneous data or no data from the radar sensor, it will shut down ACC and often the standard cruise control functions as well, as they share underlying control logic.
Diagnosing and Fixing 2020 F150 Cruise Control Not Working
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Systematic Diagnosis for Your 2020 F150 Cruise Control Issues
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Begin with the simplest checks. Locate the fuse box (typically under the dash and/or in the engine bay) and consult your owner’s manual to identify the fuses related to the cruise control system and the PCM. Visually inspect each fuse for a broken filament. If a fuse is blown, replace it with one of the same amperage. A blown fuse can indicate a short circuit, so monitor if it blows again. Also, check relevant relays if applicable, ensuring they are properly seated and functioning.
A flashing warning light or a message on the instrument cluster is usually accompanied by stored error codes in one or more modules. Connect a professional-grade OBD-II scan tool to the diagnostic port. This tool can retrieve DTCs from various modules, not just the engine. Look for codes related to the cruise control system (e.g., B-codes for body control, C-codes for chassis), ABS, or steering wheel controls. For example, a common fault is code P0571, which typically points to an issue with the brake switch circuit, essential for disabling cruise control when the brake pedal is applied. Interpreting these codes is key to narrowing down the problem area.
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Listen Free for 30 DaysThe brake pedal position sensor (or brake light switch) is a critical component. If the vehicle’s computer believes the brake pedal is depressed, even intermittently, it will prevent cruise control from engaging. A malfunctioning brake switch is a high-failure point. You can test its operation with a multimeter to check for continuity and voltage at the correct times, or by observing live data on your scan tool if it supports it. If the brake lights are also behaving erratically (staying on or not coming on), this sensor is a prime suspect.
The buttons on your steering wheel are responsible for activating and controlling cruise functions. These switches can fail over time, especially due to wear and tear or issues within the steering column. After verifying power and ground to the steering wheel module, you can test the continuity of individual switch circuits with a multimeter. In some cases, intermittent functionality when turning the steering wheel can point to issues with the wiring harness connecting these buttons, often related to the clock spring (discussed next).
Intermittent Issues and Sensor Data
Many owners report intermittent cruise control failures. This often points towards electrical connections that are beginning to fail or sensors that are providing faulty data sporadically. Low battery voltage or poor ground connections can also cause electronic modules to behave erratically, leading to unexpected system disablements. Always ensure your battery is in good health and all grounding points are clean and secure, as this forms the foundation for all electronic systems.
When checking for DTCs, pay close attention to any “pending” codes. These codes may not trigger a warning light immediately but can indicate an impending failure that is already affecting system performance.
Clock Spring and Steering Column Electrical Issues
Clock Spring Failure Symptoms
The clock spring, also known as the spiral cable or cable reel, is a crucial component located within the steering column. It’s a flexible ribbon cable that allows electrical signals to travel from the steering wheel controls (including cruise control buttons) to the rest of the vehicle, while also accommodating the rotation of the steering wheel. When the clock spring fails, it often manifests as intermittent or complete loss of functionality for steering wheel-mounted buttons, including the horn, airbags, and cruise control. Symptoms can include cruise control buttons working only when the steering wheel is turned to a specific position, or the airbag warning light illuminating. Research suggests that electrical system issues, particularly intermittent connectivity caused by a worn clock spring, are a significant contributor to sudden cruise control failures.
Working on the steering column, especially when dealing with the clock spring, involves the vehicle’s airbag system. Failure to properly disconnect the battery and follow specific safety procedures for handling airbag components can result in accidental deployment, causing serious injury. It is highly recommended that this diagnosis and repair be performed by a qualified technician.
Steering Wheel Electrical Circuit Testing
Beyond the clock spring, the wiring harness connecting the steering wheel switches can also develop issues. These can include chafed wires, loose connectors, or damage from previous repairs. Testing involves tracing the continuity of the circuits for each cruise control button from the switch back to the relevant module, often the BCM. Using a multimeter to check for voltage, ground, and continuity under various steering wheel positions can help isolate a break in the circuit. Again, due to the presence of the airbag system, this process should be undertaken with caution and expertise.
Troubleshooting Adaptive Cruise Control (ACC) Components
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Adaptive Cruise Control introduces specific components that require their own diagnostic attention. These systems are more complex and sensitive than traditional cruise control.
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See Annual PlansRadar Sensor Obstruction and Alignment
The front radar sensor is susceptible to external factors. Ensure it is free from dirt, ice, snow, or any other debris that could obstruct its view. Cleaning road grime or snow off the front grille sensor can be a quick and effective fix. If the vehicle has been involved in a front-end collision, even a minor one, the radar sensor may need recalibration or replacement. Alignment is critical; many manufacturers require specialized equipment to properly aim the radar sensor after certain repairs. Failure to do so will result in inaccurate readings and system disablement.
Wheel Speed Sensor Data Integrity
Adaptive cruise control relies heavily on accurate wheel speed data from all four wheel speed sensors, not just for ABS but also for maintaining speed and detecting vehicle movement. If any wheel speed sensor is faulty, provides erratic data, or is disconnected, the ACC system will likely disengage. Similar to the ABS system, ensure these sensors and their wiring are clean and undamaged. Check for DTCs that specifically point to individual wheel speed sensors.
Calibration and System Reset
After replacing components like the radar sensor, ABS module, or even after certain suspension work, recalibration of the ACC system may be necessary. Your scan tool should be able to perform these calibration procedures. In some cases, a simple battery disconnect for a period of time can reset the various modules and clear temporary glitches, though this should be done after more specific diagnostics are attempted.
Summary of 2020 F150 Cruise Control Not Working Solutions
Here is a quick reference to help you pinpoint the potential cause of your 2020 F150 cruise control not working based on common symptoms.
Conclusion
Most cruise control failures on a 2020 F-150 are electronic, not mechanical. Starting with a diagnostic scan is paramount before replacing expensive sensors or modules. Always verify battery health and grounding connections as a foundational step for electronic system reliability. If your diagnosis involves safety-critical components like the airbag system or complex module programming, it is always best to consult a qualified professional technician.
If these diagnostic steps don’t resolve your issue or if you encounter persistent trouble codes, it’s advisable to check for any pending manufacturer recalls with your local Ford dealer, as some electronic systems can be subject to service campaigns.
2020 f150 Cruise Control Not Working: Frequently Asked Questions
Can a blown fuse cause cruise control to fail?
Yes, a blown fuse is one of the most common culprits. The cruise control system relies on specific electrical circuits protected by fuses in the Battery Junction Box. If the circuit powering the steering wheel switches or the cruise control module is open, the system will not engage. Always check your owner’s manual for the specific fuse location, as individual circuits can vary by trim level.
Will an ABS light cause cruise control to stop working?
Absolutely. The cruise control system requires accurate wheel speed data to function correctly. If your ABS or traction control systems detect a fault, they set a Diagnostic Trouble Code (DTC) and illuminate the warning light. Because the cruise control relies on these sensors to maintain speed, the PCM will automatically disable the cruise function as a safety precaution until the ABS issue is resolved.
Is a faulty steering wheel switch common?
While not as frequent as sensor-related failures, steering wheel switch failure is a known issue. Over years of use, the internal contacts within the cruise control switch module can become worn or oxidized, resulting in an ‘open’ circuit. If your scanner shows no signal change when you press the ‘Set’ or ‘Resume’ buttons, the physical switch assembly likely needs to be replaced.
Can a bad brake pedal switch disable cruise control?
Yes. The cruise control system is hard-wired to disengage the moment it detects brake pedal movement. If the brake pedal position switch is faulty or misadjusted, the vehicle may believe the brake pedal is constantly depressed, even if it is not. This prevents the cruise control from engaging, as it interprets the status of the pedal as a ‘disengage’ command.
Does a check engine light always stop cruise control?
Yes, in most cases. When the engine’s management system detects a performance issue that triggers a check engine light, it enters a ‘fail-safe’ or ‘limp’ mode. To prevent potential engine damage or unpredictable operation while in this state, the PCM almost universally disables the cruise control system. You must diagnose and clear the engine code before the cruise control will become functional again.
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