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Diagnostic Fault Information

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

DTC U2099

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
High Speed GMLAN Serial Data Wake Up U2099, U0100-U0299(1) U0100-U0299 U0100-U0299(2) -
(1) Vehicle will not start.

(2) History only. If cleared the DTC will return after several ignition cycles.
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