Preliminary Evaluation · Closed
RPM's surging during pump mode
Manufacturer: Pierce Manufacturing
This investigation led to a recall
NHTSA links this probe to recall campaign 12V523000.
Read the recall: what is defective and the free fix →What NHTSA is examining
On January 10, 2011 the Office of Defects Investigation (ODI) opened Preliminary Evaluation (PE11-001) based on a product improvement program (PIP) (ODI TSB # 10036912) submitted by Caterpillar dated August 18, 2010. The PIP was for engine RPM's that could surge while in a water pumping mode on 2005 through 2009 Pierce fire trucks equipped with a Caterpillar C9 engine.This engine surge could cause a fluctuation in water pressure that is being directed onto a fire through a hose.The bulletin states that this condition in conjunction with other factors or circumstances could result in a risk of personal injury or death.Caterpillar's product improvement program released information involving the installation of new engine software on the subject vehicles.On April 11, 2011 ODI received Pierce's response to ODI's Information Request (IR) letter.Based on the information received, an ODI investigator contacted several fleets and complainants regarding this defect phenomena and everyone contacted expressedconcern related to the inherent danger involved with pressure oscillations in a fire hose.Several fire fighters stated that the frequency of failure even after Software fixes have been performed per the PIP are still happening.In a supplemental IR letter dated May 27, 2011 Pierce identified a total population of 241 vehicles with the C9 engine from MY 2005 - 2008. Pierce also specified that they had 15 unique complaints coupled with 2 complaints from Caterpillar; totaling 17…
Vehicles under investigation
Source: NHTSA Office of Defects Investigation records, updated daily. An investigation is not a determination that a defect exists; many probes close without a recall.