NHTSA Campaign 04V567000

STEERING

Issued by PIERCE MANUFACTURING · Reported Dec 9, 2004 · 64 vehicles affected

What's wrong

ON CERTAIN FIRE TRUCKS EQUIPPED WITH THE ALL WHEEL STEER OPTION, THE POSITION OF THE FRONT AXLE IS SENSED BY AN OPTICAL ENCODER MOUNTED TO THE BOTTOM OF THE FRONT AXLE KINGPIN, WHICH IS PROTECTED FROM THE ELEMENTS BY AN OUTER CASE. THIS CASE SHARES A COMMON GREASE CAVITY WITH THE KINGPIN. OIL THAT LEACHES FROM THE GREASE CAN MIGRATE THROUGH THE ENCODER SEAL, CAUSING CONTAMINATION OF THE OPTICAL ENCODER DISC.

Consequence

OIL ON THE DISC CAN CAUSE THE ENCODER TO SEND INCORRECT WHEEL POSITION INFORMATION AND CAN CAUSE THE REAR WHEELS TO STEER UNEXPECTEDLY CAUSING THE VEHICLE TO CRASH WITHOUT PRIOR WARNING.

Remedy

DEALERS WILL REPLACE THE ENCODERS WITH NEW ENCODERS WITH MORE ROBUST SEALS. THE CONTROL SOFTWARE WILL BE UPDATED TO PRODUCE AN ERROR CODE AND DISABLE THE REAR STEERING FUNCTION IF UNUSUAL ENCODER INPUTS ARE DETECTED. THE RECALL BEGAN JANUARY 25, 2005. OWNERS SHOULD CONTACT PIERCE AT 1-888-974-3723.

Vehicles affected by this recall

Make Model Year Units
PIERCE CUSTOM CHASSIS 2002 64
PIERCE CUSTOM CHASSIS 2003 64
PIERCE CUSTOM CHASSIS 2004 64

Source: NHTSA Campaign 04V567000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.