GM Series Ignition Coil 56028138 56028138AB 56028138AD 56028138AE 56028138AF

If your vehicle experiences rough idle, weak acceleration, or noticeably higher fuel consumption, or the engine warning light comes on, it is likely the high-voltage pack aging causing insufficient ignition energy or intermittent misfire. This part converts low voltage to high voltage and precisely ignites the air-fuel mixture in the cylinders to ensure smooth operation and power delivery. Fits GM 6-cylinder engines, OEM number 56028138, compatible with suffixes 56028138AB/AD/AE/AF, etc. When installing, disconnect the battery negative, ensure ignition coil and spark plug contact surfaces are clean and oil-free, and follow the OEM torque exactly to avoid secondary faults.