Question about 2004 Chevrolet Suburban
In this car the shifting command is electronic, directly controlled by the the TCM - it shifts uncommanded because the power supply from the battery to the transmission computer fluctuates wildly and the computer malfunctions .
Since this happens only at startup it means that the battery can't deliver enough voltage during startup - measure it to see its status, it might be old and in need of a replacement. After that check the connectors in the wiring to the TCM and at the battery, they might be loose or corroded.
Posted on Apr 03, 2011
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Posted on Jan 02, 2017
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