News Technical Service Bulletins

There's the Rub With Chevy Silverado

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Example of engine harness that has rubbed against the vacuum pump pulley.

This bulletin applies to 2014-2018 Chevy Silverado 1500, 2019 Silverado LD, 2015-2019 Suburban/Tahoe vehicles, equipped with a 5.3L L83 or 6.2L L86 engine. Some owners may comment about the illumination of the SES MIL and ABS MIL, a Service Suspension System message, misfire, hesitation, low engine power, erratic transmission shifting, no-crank, A/C inoperative, a low engine oil level message and/or fuse(s) blown (STRTR fuse and/or A/C clutch fuse). In addition, an array of possible DTCs may be stored. This issue could be caused by the engine harness rubbing on the engine vacuum pump pulley.

Inspect the harness in this area and repair as needed. Re-secure the harness away from the pulley.

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