12596577 | Genuine GM® Engine Control Module

Description: Engine Control Module 12596577 (also called ECU) — it’s the computer that manages various engine operations (fuel injection, ignition timing, emissions control, etc.). Engine Control Module 12596577 fits 2004–2008 Cadillac CTS, SRX, Buick LaCrosse, Rendezvous Part Number: 12596577 Condition: New Manufacture/Brand: GM Fits 12596577 For  Year Make Model Body & Trim Engine & Transmission 2008 Buick LaCrosse CXS 3.6L V6 - Gas 2007 Buick LaCrosse CXS 3.6L V6 - Gas 2007 Cadillac CTS Base 2.8L V6 - Gas, 3.6L V6 - Gas 2006 Buick LaCrosse CXS 3.6L V6 - Gas 2006 Buick Rendezvous CX, CXL 3.6L V6 - Gas 2006 Cadillac CTS Base 2.8L V6 - Gas, 3.6L V6 - Gas 2006 Cadillac SRX Base 3.6L V6 - Gas 2005 Buick LaCrosse CXS 3.6L V6 - Gas 2005 Buick Rendezvous CXL Plus, Ultra 3.6L V6 - Gas 2005 Cadillac CTS Base 2.8L V6 - Gas, 3.6L V6 - Gas 2005 Cadillac SRX Base 3.6L V6 - Gas 2004 Buick Rendezvous CXL, Ultra 3.6L V6 - Gas 2004 Cadillac CTS Base 3.6L V6 - Gas 2004 Cadillac SRX Base 3.6L V6 - Gas Purpose of using 12596577: Function What It Does Fuel Management Controls fuel injection timing and amount Ignition Timing Optimizes spark timing for power and efficiency Idle Control Maintains stable engine idle under all conditions Emissions Control Works with O2 sensors, EGR, etc., to reduce emissions Turbo / Boost Control (diesel or turbo engines) Manages boost pressure safely Diagnostic Monitoring Detects engine issues and stores trouble codes (DTCs) Communication Talks to other systems (transmission, ABS, ESC) via CAN bus Signs of Bad Engine Control Module 12596577: Check Engine Light (CEL) Comes on unexpectedly May store unrelated or confusing error codes Engine Misfires or Poor Performance Hesitation, stalling, rough idle, or surging Weak acceleration or random power loss Hard Starting or No Start The engine cranks but doesn’t start Or starts and immediately dies No injector pulse or ignition spark Bad Fuel Economy ECM may send incorrect fuel/air mix Over-fueling or under-fueling conditions Transmission Shifting Problems (if TCM is integrated) Erratic or harsh shifts Stuck in a single gear Failed Emissions Test If ECM can't regulate emissions, O2 sensors, or EGR Electrical Gremlins Random warning lights Intermittent loss of gauges or dashboard functions Unable to Communicate with Scan Tool If ECM is dead, it won’t respond via OBD-II/CAN About the Manufacturer – GM: General Motors (GM) is one of the largest and most iconic automotive manufacturers in the world. Founded in 1908 and headquartered in Detroit, Michigan, GM designs, builds, and sells vehicles under several well-known brands, including Chevrolet, GMC, Cadillac, and Buick. GM is known for its long history of innovation in the automotive industry, from developing early electric vehicles to advancing autonomous driving and connected car technologies. The company has a strong global presence and is committed to a future of zero crashes, zero emissions, and zero congestion, with significant investments in electric vehicles (EVs) and sustainable mobility.