This TSB applies to all GM 2003-2008 passenger cars and trucks (including Saturn), 2003-2008 Hummer H2/H3 and 2005-2008 Saab 9-7X vehicles.
Some customers may comment that the engine starter will continue to run after the ignition key is released. For the 2003 through 2008 model years, the PCM or ECM controls the starter relay based on input from the key switch. When the ignition switch is held in the start position for 0.4 seconds, the PCM/ECM start timer is activated. Once the start timer is activated, the PCM/ECM will continue to crank the starter until either the engine starts or a no-start time limit is reached.
Occasionally, the fuel pump module will take one or two seconds to build pressure. Often this will occur after the vehicle sits overnight. During some engine starts, the customer may release the ignition switch key before the engine actually starts. When this occurs, the engine will then continue to crank until the engine starts or until the no-start time limit is reached. This is a normal condition and no repairs should be required.