2017-2019 Honda Ridgeline ACC & CMBS Radar Sensor: Failure, Diagnosis, and Replacement

Variant & Trim Level Compatibility

This cruise control distance sensor is specific to 2017-2019 Honda Ridgeline models equipped with the Honda Sensing package. For these model years, this package was standard equipment on the RTL-E and Black Edition trims. If your Ridgeline is a different trim level without Adaptive Cruise Control (ACC), it will not be equipped with this radar sensor. Always verify your vehicle's features before ordering.

Symptoms of a Failing Cruise Control Distance Sensor

When the radar sensor fails, is blocked, or is misaligned, it will disable the advanced driver-assistance systems that rely on it. You will typically see one or more warning messages on the multi-information display.

• "Adaptive Cruise Control (ACC) Problem" Warning Light: This is the most direct symptom. The ACC system will be disabled, and only conventional cruise control may be available, if any.
• "Collision Mitigation System Problem" Warning Light: Because the CMBS uses the same radar, its failure will trigger this warning as well.
• Multiple System Warnings: Often, other related system warnings will appear at the same time, such as for the Road Departure Mitigation (RDM) system.
• ACC or CMBS Unavailable: The systems may simply become unavailable without a specific "problem" message, sometimes accompanied by an "ACC OFF" notification after trying to engage the system.
• Phantom Braking or False Alerts: In some cases, a malfunctioning sensor can give false readings, causing the CMBS to brake unexpectedly or the ACC to behave erratically, though this can also be a software issue.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

As of mid-2026, there are no specific recalls for the cruise control distance sensor itself on the 2017-2019 Honda Ridgeline. However, there have been investigations and owner complaints related to the Honda Sensing suite across various models.

• NHTSA Investigations: The National Highway Traffic Safety Administration (NHTSA) has investigated issues like "phantom braking" in Honda vehicles, where the CMBS applies the brakes without a clear danger. This is sometimes related to sensor or software issues.
• Rearview Camera Recall: A recall query was opened for 2017-2019 Ridgelines concerning the rearview camera harness, which can break from opening and closing the tailgate. This is a separate issue but relates to the vehicle's overall electronic systems.
• Fuel Pump & Subframe Recalls: These model years have also been subject to recalls for a failing fuel pump and for rear subframe corrosion in salt-belt states, but these are unrelated to the cruise control sensor.

No specific TSBs directly addressing widespread failure of this radar unit were found, though general diagnostic procedures for F-CAN bus errors (the communication network these systems use) exist.

Buying a Used 2017-2019 Ridgeline Cruise Control Sensor

A used OEM radar sensor can be a cost-effective alternative to a brand-new unit, but careful inspection is critical. Given the electronic complexity and safety-critical function, a cheap aftermarket part is not a recommended or widely available option.

1. Verify the Part Number: Match the part number on the used sensor to your original unit. Known part numbers for this generation include 36800-T6Z-A01, 36802-T6Z-A01, and 36802-T6Z-A02. Part number 36802-T6Z-A02 is a common replacement for 36802-T6Z-A01.
2. Inspect for Physical Damage: The sensor's location in the grille makes it vulnerable to impacts from road debris and minor fender-benders. Carefully inspect the plastic housing for cracks, deep scuffs, or any signs of impact. Check that all mounting tabs are intact and undamaged.
3. Examine the Electrical Connector: The connector pins should be straight, clean, and free of any corrosion. A damaged connector can prevent the unit from communicating with the vehicle's computer.
4. Ask About the Donor Vehicle: If possible, find out the history of the vehicle the part came from. A part from a vehicle with a clean front-end history is always preferable to one from a front-collision vehicle.
5. Budget for Calibration: This is non-negotiable. A used sensor will not work correctly just by plugging it in. It must be professionally aimed and calibrated to your specific vehicle. Factor this significant cost into your budget.

Cost of Replacement

The cost of replacing the cruise control distance sensor is significant, largely due to the price of the part and the required calibration labor.

Installation & Calibration Overview

Difficulty: 5/5 (Due to mandatory calibration)

While the physical installation of the sensor is relatively simple, the overall job is not considered DIY-feasible because of the calibration requirement.

1. Access the Sensor: The sensor is located in the lower front grille. Depending on the exact trim and year, this may require partial or full removal of the front bumper cover to access the mounting bracket.
2. Remove the Old Sensor: Disconnect the electrical harness and unbolt the sensor from its bracket.
3. Install the New Sensor: Bolt the new (or used) sensor onto the bracket and reconnect the electrical connector. Reassemble the bumper cover.
4. Perform Radar Calibration: This is the professional step. The vehicle is placed in a specific workshop environment with a level floor and no obstructions. A technician uses a specialized rig with a radar reflector target placed at a precise distance and position in front of the vehicle. Using a dealer-level scan tool (like the Honda i-HDS), the technician initiates the radar aiming procedure, which aligns the sensor's field of view with the vehicle's centerline. This ensures the radar is looking straight ahead and can accurately judge distances.

Frequently Asked Questions (FAQ)