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Which engine do you have in your truck?
I would say you almost definitely have a problem with the instrument cluster. If you can bang on it and the problem goes away there is probably a break in the circuit board where the main connector plugs into the cluster. You will probably need to have the cluster replaced or rebuilt. There are a couple of companies on ebay that offer instrument cluster rebuilding, but I couldn't recommend a particular one.
If you want to test it for sure and you have some time to tinker with your power probe you can check the following:
First use a voltmeter to monitor the voltage on fuses F2.2, F2.33 and F2.45 in the Central Junction Box (CJB) (interior fuse panel) when the problem occurs. Verify that the fuses show normal battery voltage (around 12 V).If the fuses show normal voltage, access the instrument cluster connectors. At connector C220a (the Black (BK) 26 terminal connector) check the voltage on pins 13 Red/Yellow (RD/YE) and 22 Black/Pink (BK/PK), and 26 Light Green/Orange (LG/OG) with key on. Also check in connector C220b (the Blue (BL) 26 terminal connector) pins 13 and 19 Black/Light Green (BK/LG) wires also for normal battery voltage. If the voltage is spiking high on any of the wires when the problem occurs, check for any add-on equipment or anything that could be inducing voltage above battery voltage in to the circuits and repair as needed.If the powers are OK, check the grounds at pin 10 Black (BK) wire in C220a and pin 12 Pink/Orange (PK/OG) wire in C220b. Repair either ground as needed.If all the powers and grounds are good when the problem occurs and a code B1317 for high voltage returns, suspect an internal instrument cluster problem. If the instrument cluster is replaced, it will need to be configured with a factory scanner.
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