Chevrolet Express 3500 electronic brake controller and brake modulator failure, both replaced along with brake fluids on Chevrolet Express 3500

Some Chevrolet Express 3500 owners report experiencing issues with the electronic brake controller and brake modulator, which can compromise the vehicle's braking system. Symptoms of Electronic Brake Control Module (EBCM) failure may include difficulty in identifying the problem and challenges in replacing the faulty module. Some owners find that the brake hydraulic modulator valve can malfunction, requiring replacement, while the EBCM might still function properly. Additionally, a programming seed and device key mismatch can cause the EBCM to fail to unlock, necessitating replacement for calibration or software updates. Fault codes like U1041 may be triggered by a faulty EBCM, often due to poor electrical connections or harness problems. It is crucial for owners to consider potential causes like bad connections at the EBCM ground rather than solely blaming the control module. Timely replacement of the EBCM and addressing brake modulator issues, along with maintaining proper brake fluid levels and quality, are essential for ensuring the integrity and safety of the braking system.