20 Most Recent 2007 Chevrolet Silverado 2500HD - Page 3 Questions & Answers

GM had a TSB on the switch module. I would check for a code and then procede from there. check the fuse and relay

seek professional help

OBD is fused with cigarette lighter.

Check the fuel distrubor

Your truck has the infamous Passlock anti-theft system. The ignition key has two small black rectangles with a small wire running down the length of the center on either side of the key shaft. When you insert the key into the ignition lock, the wires in the small black rectangles contact a sensor in the lock cylinder. These sensors complete a path to the Electronic Control Module (ECM), which tells the fuel and starter circuits to engage. If the key wires or lock cylinder sensor are damaged or dirty, the signal is not sent to the ECM, your truck will not start, and it may even die while running. The dealers remedy this by selling you a new ignition lock cylinder, and they cut a new key with the proper value to match the old key. This will run you $500 to $600 or more. There are ways to bypass your Passlock system, and several are detailed in Youtube videos. I'd suggest watching a few of them and determine which bypass method works for you. Good luck.

to be sure test terminal 16 with test light to a good groundtest terminal 4 and 5 with test light to good powerif all good check for terminal wide open to muchif power is not good underhood block fuses turn over check connector c2 d9 for power if good wire cut ckt 640

There is a separate fuse for the tail lights,and also there is a circuit board in each tail light they may need to be replaced,if there is a trailer package,then the wire harness for that could be the problem also.

mo me it sounds like low fuel volume i would check my lift pump

Sounds like the transfer case is not engaging into 4wd. It has a solenoid or actuator, but it could be damaged inside too.