Broken or Loose Engine Ground Cable

A broken or loose engine ground cable/strap on some 2019-2020 Silverado 1500 and Sierra 1500 models equipped with the 2.7L engine (RPO L3B), 5.3L engine (RPO L84) or 6.2L engine (RPO L87) may result in the following conditions:

  • Engine does not start after an Auto Stop event
  • Intermittent no crank
  • DTCs set (any of the following DTCs: U0102, U0284, U0285, U0672, P0617, P26E6, P305D, U111A, U111E, U1348)

Inspect the engine to body ground cable strap, G132 (Fig. 16, #1) and G134 (Fig. 16, #2) for any damage or loose connections.

 

Fig. 16

 

Tighten any ground connections that are loose (Fig. 17) or replace the ground cable/strap if it is damaged. (Fig. 18) Ensure that the ground cable/strap is properly orientated to prevent future damage to the ground cable/strap that may be caused by powertrain movement.

 

Fig. 17

 

Fig. 18

 

For additional information, refer to the latest version of #PIT5689.

 

– Thanks to Jim Will

Extended Engine Crank Time
GM Service Know-How

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