GM AFM/DOD Service — Path 1 (OEM Compliant)

GM’s Active Fuel Management (AFM), also known as Displacement on Demand (DOD), is an innovative system designed to improve fuel efficiency on select 5.3L, 6.0L, and 6.2L V8 engines by selectively deactivating cylinders under light load conditions. While effective in reducing fuel consumption, AFM/DOD systems are prone to specific mechanical failures, particularly with lifters and camshafts, which can lead to lifter collapse, excessive oil consumption, and the infamous ticking noise. At Apex Automotive in Gilbert, AZ, David Jr. offers an OEM-compliant GM AFM/DOD service that restores your engine to factory specifications using genuine OE parts and ACDelco factory programming.

AFM lifters contain internal solenoids and locking mechanisms that deactivate cylinders by collapsing under certain operating conditions. Over time, lifters on 5.3L and 6.2L V8 engines can fail due to oil breakdown, contamination, and heat-induced wear. The extreme Arizona desert heat accelerates oil degradation, increasing the risk of lifter collapse and subsequent camshaft lobe wear. When lifters fail, they cause poor cylinder deactivation, resulting in a noticeable ticking noise, reduced fuel economy, and engine performance issues. Left unaddressed, this can lead to costly camshaft damage and potential powertrain warranty concerns.

David Jr.’s diagnostic-first approach begins with a comprehensive inspection of the AFM lifters, camshaft, and oil condition using factory scan tools and oil analysis. He evaluates the AFM solenoid operation, checks for diagnostic trouble codes (DTCs), and performs a detailed mechanical assessment to identify the root cause of failure. This meticulous process avoids unnecessary parts replacement—eliminating what he calls the “parts cannon” approach—saving time and money while ensuring a precise fix.

The OEM-compliant service includes replacing failed lifters with GM Genuine OE parts (part numbers such as 12641463 for AFM lifters) and installing updated camshafts designed to resist premature wear. David Jr. programs the vehicle’s powertrain control module (PCM) using ACDelco factory software to ensure proper AFM functionality and system calibration. This preserves your factory warranty and maintains your engine’s original performance and efficiency targets.

By choosing Apex Automotive’s GM AFM/DOD service, drivers in Gilbert and the East Valley protect their engines from Arizona’s harsh operating environment. David Jr.’s expert care extends engine life, restores smooth operation, and maximizes fuel economy—providing peace of mind with a personal mechanic you can trust. This service is available by appointment only to ensure focused, high-quality attention to every GM AFM-equipped vehicle.