Peterbilt 384, 388 +5 more: Powertrain

Affects Peterbilt 384, 388, 365, 587, 367, 386, 387 · 2008–2012 — about 23 vehicles.

The hazard

On certain trucks equipped with a PACCAR MX engine and Eaton Ultrashift DM or Allison automatic transmission (without auto-neutral), the Fast Idle Control (also known as high idle) may be activated by the operator while the transmission is in gear. This could override the parking brake, allowing the vehicle to move unexpectedly. Unintended vehicle movement could result in a crash causing property damage and/or personal injury. Correction: Dealers will update the engine control software.

What to do

Contact your dealer; the remedy details were not included in the filing.

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