Silverado Secret

This bulletin applies to 2014-2018 Chevy Silverado vehicles equipped with a 4.3L, 5.3L or 6.2L engine. The customer may comment on an SES light on. The technician may find DTC P0300 set and/or a rough running engine concern.

If diagnostics have been completed with no trouble found, inspect for a possible terminal tension concern on both the ignition coil power feed for a possible cause of the DTC and/or a rough running engine, and the X2 connector of the UBEC (underhood fuse block) for an intermittent SES traction control lamp concern.

The X2 connector. Check for terminal “spread” and loss of tension.
<p>The X2 connector. Check for terminal &ldquo;spread&rdquo; and loss of tension.</p>

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