🚨 Diagnostic Profile
Vehicle Make: BUICK
Technical Description: Cruise Control System Active Braking Control Active
This condition typically indicates that the vehicle’s Electronic Brake Control Module (EBCM) or the Adaptive Cruise Control module has detected a fault related to the forward-sensing radar, brake pressure modulator, or a communication error on the CAN bus between the cruise control module and the ABS/traction control system. When this message or code appears, the Active Braking (Automatic Braking) feature used for collision mitigation may be disabled, and cruise control functionality may be locked out as a safety precaution.
🚨 Repair Difficulty Tier
Difficulty Rating: Professional Only
This repair falls under the Professional Only category because it involves safety-critical systems (Active Braking/Collision Mitigation) and may require specialized GM dealership-level scan tools (such as GDS2 or Tech2Win) to properly diagnose radar alignment, calibrate sensors, or flash/reprogram the EBCM or ACC control modules. Incorrect handling of these systems can result in unintended braking events or failure of the automatic braking system, posing a significant safety liability.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
Begin by visually inspecting the front fascia area where the radar/forward-sensing module is mounted (usually near the front grille or behind the Buick emblem) for physical damage, debris, dirt, or misalignment. Check for any aftermarket modifications to the front bumper that could obstruct the sensor’s field of view. Inspect wiring harness connectors leading to the Electronic Brake Control Module (EBCM) and the cruise control module for corrosion, chafing, or loose pins. Also check the brake pedal position sensor and brake fluid level, as low brake fluid can sometimes trigger active braking faults.
Step 2: Diagnostic Verification
Connect a GM-specific scan tool (such as Tech2Win or GDS2) to the vehicle’s OBD-II port to pull stored Diagnostic Trouble Codes (DTCs) from the EBCM, ACC module, and Body Control Module (BCM). Common related codes may include radar misalignment codes, loss of communication (U-codes) between modules, or brake pressure sensor circuit faults. Review live data streams for radar sensor status, brake pressure readings, and steering angle sensor input, as these all feed into the Active Braking system. Perform a radar alignment check procedure if the scan tool indicates the sensor is out of calibration range.
Step 3: Resolution & Reset Process
If a faulty radar sensor or EBCM is identified, replace the defective component with an OEM-specified part. After replacing any module, perform the required relearn/calibration procedure using the dealership-level scan tool, which may involve static or dynamic radar recalibration (requiring a target board and precise vehicle positioning, or a test drive at specified speeds). Clear all stored DTCs and perform a full system reset. Conduct a road test to confirm the cruise control and Active Braking Control systems re-engage without triggering fault messages.
📦 Parts, Labor, and Budget Estimates
Required Components/Software: Forward-sensing radar module, Electronic Brake Control Module (EBCM), brake pressure sensor, GM Tech2Win/GDS2 diagnostic and calibration software, radar calibration target kit.
Average Component Price: $350 – $950 depending on the specific module (radar sensors tend to run $400-$700, EBCM replacement can range $500-$900, plus dealer programming fees of $100-$200).
Estimated Labor Hours: 2.5 to 4.5 hours, including diagnostic time, component replacement, and mandatory sensor recalibration/relearn procedures.