GMC Sierra 3500: Fuel system — auxillary tank

Affects GMC Sierra 3500 · 2011–2015 — about 35K vehicles.

The hazard

If the front tank overfills, the excess pressure may cause the front tank to expand and contact the driveshaft, possibly resulting in a hole in the tank. The hole will leak fuel, which in the presence of an ignition source, can increase the risk of a fire.

What to do

GM has notified owners, and dealers will replace the rear tank fuel pump or update the fuel-level sensor software, as well as inspect the front tank, replacing it as necessary, free of charge. The recall began December 11, 2017. Owners may contact GM customer service for Chevrolet 1-800-222-1020 or for GMC customer service at 1-800-462-8782. GM's number for this recall is 17399.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational