NHTSA Investigation PE87060

SHUTDOWN W/O WARNING

SUMMARY OF INFORMATION FROM MANUFACTURER:THE EFFECT OF THIS FAILURE ONTHE USER IS THAT OF A SIGNIFICANT NUISANCE.INITIAL FAILURE ANALYSIS OFSUBJECT FUEL SHUTDOWN SOLENOIDS RETURNED UNDER WARRANTY INDICATED 29PERCENT OF THE FAILURES WERE ELECTRICAL, 42 PERCENT MECHANICAL AND 29PERCENT HAD NO FAILURE AND PROBABLY WERE REPLACED DUE TO FAULTY DIAGNOSIS.CHANGES WERE MADE TO RESOLVE THE ELECTRICAL AND MECHANICAL PROBLEMS.SOLENOID FAILURE HISTORY IMPROVED UNTIL SUPPLIER'S COIL SOURCE WAS CHANGED,AGAIN RESULTING IN HIGH FAILURE RATES.CURRENTLY FIELD FAILURE STATISTICSCOVERING THE LATEST SOLENOID MODIFICATION ARE BEING EVALUATED TO DETERMINEIF THE PROBLEM HAS BEEN CORRECTED.ANALYSIS:FAILURE OF THE FUEL SOLENOID RESULTS IN THE ENGINE STOPPINGWITHOUT WARNING OR REFUSING TO START.SHUTDOWN OF THE ENGINE WITHOUTWARNING COULD HAVE AN IMPACT ON THE DRIVER'S ABILITY TO PROPERLY STEER THETRUCK AND POSSIBLY LEAD TO A DECREASE IN AIR BRAKE TANK PRESSURE.PROPOSED ACTION:UPGRADE THIS PE TO AN EA.SEND AN IR.===

An investigation is a separate record from a recall and from a manufacturer communication. A manufacturer campaign to repair a safety defect or a failure to meet a federal safety standard.