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P0556 Diagnostic Trouble Code Discussion for April 2013

Brake Booster Pressure Sensor Performance

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Trouble Ticket Help Requests for DTC P0556
Help Request Posted
2007 Chevrolet Silverado 2500 HD Classic LT 6.0L No Start VIN: 1GCHC24U17
P0556: ignition one voltage low. this vehicle came in a tow truck,dye on the fly I have a code for no ignition one voltage, the scanner shows 0 voltage,but I have power to the ignition coils with the key on ignition relay has two battery voltages with the key on. fuel pump does not turn on,by...
April 03, 2013