IllustrationSTARTED MY VEHICLE SO COULD MOVE IT IN FRONT OF MY GARAGE. WHEN I TRIED TO TURN THE STEERING WHEEL WOULDN'T MOVE AND I HAD VERY LIMITED BRAKING POWER. IT TOOK AN EXCEPTIONAL AMOUNT OF PRESSURE ON THE BRAKE PEDAL JUST TO STOP THE VEHICLE AT A VERY LOW SPEED. THANKFULLY NO ONE WAS HURT AND NO PROPERTY DAMAGE OCCURRED. *TR
2002 GMC Sierra 2500
Owner reports · Recalls · Investigations
More warning signs than most Sierra 2500 years
Owner complaints for the 2002 GMC Sierra 2500 are substantially higher than the model-year median of 46.
About this comparison →How this year compares
Owner complaints by model year
Compare all Sierra 2500 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
110–25K
1525–50K
2450–75K
1975–100K
30100–150K
15150K+
114 reports with mileage · 20 unknown
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Service Brakes, Hydraulic. Review the 44 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Service Brakes. Review the 32 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Power Train. Review the 14 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
10 crash reports1 fire reports5 injury reports
What owners actually said
134 reportsTL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. WHEN THE CONTACT DEPRESSED THE BRAKE PEDAL, THE VEHICLE DID NOT STOP IMMEDIATELY. THE ABS EVENTUALLY ENGAGED. THE DEALER STATED THAT THE VEHICLE WAS NOT INCLUDED IN NHTSA CAMPAIGN ID NUMBER 05V379000 (SERVICE BRAKES, HYDRAULIC:ANTILOCK). THE FAILURE AND CURRENT MILEAGES WERE 101…
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TL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. WHEN THE CONTACT DEPRESSED THE BRAKE PEDAL, THE VEHICLE DID NOT STOP IMMEDIATELY. THE ABS EVENTUALLY ENGAGED. THE DEALER STATED THAT THE VEHICLE WAS NOT INCLUDED IN NHTSA CAMPAIGN ID NUMBER 05V379000 (SERVICE BRAKES, HYDRAULIC:ANTILOCK). THE FAILURE AND CURRENT MILEAGES WERE 101,296.
TL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. WHENEVER THE CONTACT DEPRESSES THE BRAKE PEDAL WHILE DRIVING AT ANY SPEED, THE PEDAL PULSATES AND ACTS AS IF IT DOES NOT WANT TO GO DOWN PROPERLY. THE BRAKES MAKE A NOISE AND THE VEHICLE DOES NOT STOP PROPERLY. THE CURRENT MILEAGE WAS 7,000 AND FAILURE MILEAGE WAS 300.
FRONT WHEEL BEARINGS DEGRADED TO THE POINT THAT ENTIRE WHEEL WAS LOOSE FROM HUB. WHEN ON A JACK COULD MOVE THE WHEEL SEVERAL INCHES IN OR OUT OF WHEEL HOUSING WITH MINIMAL HAND PRESSURE. REPAIR AGENCY INDICATED THAT THERE WAS A DISTINCT POSSIBILITY THAT, IF UNDETECTED, THIS CONDITION COULD HAVE CREATED A SITUATION LEADING TO A…
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FRONT WHEEL BEARINGS DEGRADED TO THE POINT THAT ENTIRE WHEEL WAS LOOSE FROM HUB. WHEN ON A JACK COULD MOVE THE WHEEL SEVERAL INCHES IN OR OUT OF WHEEL HOUSING WITH MINIMAL HAND PRESSURE. REPAIR AGENCY INDICATED THAT THERE WAS A DISTINCT POSSIBILITY THAT, IF UNDETECTED, THIS CONDITION COULD HAVE CREATED A SITUATION LEADING TO A SERIOUS ACCIDENT (AFFECT TO STEERING/CONTROL). THE SECOND FRONT WHEEL BEARING EXPERIENCED THE SAME DEFECT APPROXIMATELY 8 MONTHS LATER, EVEN AFTER BEING INSPECTED AT THE TIME OF THE OTHER FAILURE. *TR
TL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. THE VEHICLE HAS FIRESTONE RADIAL, SIZE LT/245/75/R16 TIRES. WHILE DRIVING APPROXIMATELY 65 MPH, THE DRIVER SIDE FRONT TIRE BLEW OUT. THE CONTACT WAS ABLE TO SAFELY MANEUVER TO THE SIDE OF THE ROAD. HE NOTICED THAT THE TREAD COMPLETELY DETACHED FROM THE TIRE. PRIOR TO DRIVING TH…
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TL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. THE VEHICLE HAS FIRESTONE RADIAL, SIZE LT/245/75/R16 TIRES. WHILE DRIVING APPROXIMATELY 65 MPH, THE DRIVER SIDE FRONT TIRE BLEW OUT. THE CONTACT WAS ABLE TO SAFELY MANEUVER TO THE SIDE OF THE ROAD. HE NOTICED THAT THE TREAD COMPLETELY DETACHED FROM THE TIRE. PRIOR TO DRIVING THE VEHICLE, HE NOTICED THAT THE TIRE PRESSURE WAS NORMAL. THE MANUFACTURER STATED THAT THE TIRES WERE NOT DEFECTIVE. THE CURRENT AND FAILURE MILEAGES WERE APROX. 40,000. UPDATED 02-19-08 *BF UPDATED 02/14/08 *TR
FIRESTONE LT245/75-R16 STEELTEX RADIAL A/T TREAD SEPARATED AT 55 MPH. TWO ESTIMATES OF DAMAGE TO VEHICLE, APPROXIMATELY $3,700. SENT TIRE TO FIRESTONE WHO DENIED LIABILITY. ATTRIBUTED TREAD SEPARATION TO "OVER DEFLEXION". *TR
TL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. WHILE DRIVING BETWEEN 2-5 MPH, THE STEERING WHEEL STIFFENED WHEN IT WAS TURNED TO THE LEFT. WHEN TURNED TO THE RIGHT, THE STEERING WHEEL BECAME RESISTANT. THE FAILURE DID NOT OCCUR WHEN THE VEHICLE WAS DRIVEN STRAIGHT. THE DEALER STATED THAT THE STEERING VALVE AND STEERING BOX N…
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TL*THE CONTACT OWNS A 2002 GMC SIERRA 2500 HD. WHILE DRIVING BETWEEN 2-5 MPH, THE STEERING WHEEL STIFFENED WHEN IT WAS TURNED TO THE LEFT. WHEN TURNED TO THE RIGHT, THE STEERING WHEEL BECAME RESISTANT. THE FAILURE DID NOT OCCUR WHEN THE VEHICLE WAS DRIVEN STRAIGHT. THE DEALER STATED THAT THE STEERING VALVE AND STEERING BOX NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED BECAUSE THE PART WAS UNAVAILABLE. THE FAILURE MILEAGE WAS 80,000 AND CURRENT MILEAGE WAS 81,499.
ABS BRAKE SENSOR FAILURE. AT LOW SPEEDS THE ABS WORK EVEN WHEN WHEELS ARE NOT LOCKED UP. THE FIRST TIME I EXPERIENCED THIS WAS PULLING A 7000LB TRAILER. I HAD TO DIVERT THE TRUCK AND TRAILER ONTO THE SHOULDER TO AVOID PLOWING INTO TRAFFIC IN FRONT OF ME. THIS APPEARS TO BE A VERY EXPENSIVE REPAIR TO MAKE, REPLACING THE FRONT WHE…
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ABS BRAKE SENSOR FAILURE. AT LOW SPEEDS THE ABS WORK EVEN WHEN WHEELS ARE NOT LOCKED UP. THE FIRST TIME I EXPERIENCED THIS WAS PULLING A 7000LB TRAILER. I HAD TO DIVERT THE TRUCK AND TRAILER ONTO THE SHOULDER TO AVOID PLOWING INTO TRAFFIC IN FRONT OF ME. THIS APPEARS TO BE A VERY EXPENSIVE REPAIR TO MAKE, REPLACING THE FRONT WHEEL HUB ASSEMBLIES. CURRENTLY WE HAVE HAD TO DISCONNECT ONE OF THE ABS SENSORS TO KEEP THE ABS FROM ACTIVATING. *JB
WITHIN 60 DAYS OF PURCHASE (01/19/2002 I REPORTED TO THE SELLING DEALER (DENNIS DILLON GMC, BOISE, ID) THAT THE HITCH BOX WAS EXTREMELY LOOSE ALLOWING THE TOWING HITCH TO MOVE BOTH VERTICALLY AND HORIZONTALLY WHEN INSTALLED ON THE TRUCK. HAVING OVER 12 YEARS EXPERIENCE IN THE RV INDUSTRY I KNEW IT TO BE WORRY SOME. I PRESSED TH…
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WITHIN 60 DAYS OF PURCHASE (01/19/2002 I REPORTED TO THE SELLING DEALER (DENNIS DILLON GMC, BOISE, ID) THAT THE HITCH BOX WAS EXTREMELY LOOSE ALLOWING THE TOWING HITCH TO MOVE BOTH VERTICALLY AND HORIZONTALLY WHEN INSTALLED ON THE TRUCK. HAVING OVER 12 YEARS EXPERIENCE IN THE RV INDUSTRY I KNEW IT TO BE WORRY SOME. I PRESSED THE POINT SUCH THAT A REGIONAL REP LOOKED AT IT. THE EVENTUAL RESPONSE WAS THAT THE HITCH WAS BUILT TO SPECIFICATION AND THEY FELT NOTHING WAS WRONG. ANNUAL INSPECTION OF RECEIVER HITCH (TRAILER HITCH) IN EARLY 2006 SHOWED A MARKED TWIST OF THE RECEIVER BOX THAT THE TRAILER HITCH SHANK RIDES IN. CLOSER INSPECTION OF THE HITCH BOX SHOWED A SEPARATION AT THE FORWARD END OF THE HITCH BOX AND A PRONOUNCED DISTORTION OF THE WEEP HOLES IN THE TORQUE TUBE (CROSS MEMBER). I PHOTOGRAPHED THE OLD HITCH AND REPLACED IT WITH A NEW EAZ LIFT HITCH ON 4/14/2006. *JB
WHILE TRAVELING WITH THE TAILGATE DOWN I RAN OVER A SPEED BUMP AND THE TAILGATE CAME LOOSE AND WAS HANGING BY THE SAFETY CABLES. THE RIGHT HINGE POINT WAS BENT AND COULD NOT BE STRAIGHTENED. WILL REPLACE BOTH HINGE POINTS. *TR
Official recalls
101V220000 · Interior Lighting
Jun 26, 2001
VEHICLE DESCRIPTION: CERTAIN PICKUP TRUCKS EQUIPPED WITH 6.6L DIESEL ENGINES FAIL TO COMPLY WITH REQUIREMENTS OF FMVSS NO. 105, "HYDRAULIC AND ELECTRIC BRAKE SYSTEMS." THESE VEHICLES HAVE A BRAKE SYSTEM WARNING LIGHT IN THE INSTRUMENT CLUSTER THAT MAY NOT ILLUMINATE WHEN THE BRAKE FLUID IS LOW. IN ADDITION, WHEN THE BRAKE FLUID IS LOW, THE VEHICLE MAY NOT MEET THE PARTIAL SYSTEM REQUIREMENTS OF FMVSS NO. 105.
Consequence & remedy
Consequence: THESE CONDITIONS COULD RESULT IN REDUCED BRAKING CAPABILITY, WHICH COULD LEAD TO A CRASH.
Remedy: DEALERS WILL CHANGE THE LOCATION OF A WIRE CONNECTION IN THE UNDERHOOD BUSSED ELECTRICAL CENTER. OWNER NOTIFICATION BEGAN JULY 9, 2001. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020 OR GMC AT 1-800-462-8782.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
3EA07013 · Trailer Hitch Receiver Failure
Opened Sep 14, 2007 · Closed Sep 12, 2008
Status: closed (inferred from source dates) · Trailer Hitches
COMPLAINT REPORTS ALLEGE POOR WELD QUALITY AND/OR BENDING OF THE SUBJECT VEHICLE ORIGINAL EQUIPMENT TRAILER HITCH RECEIVER.THE AGENCY'S INVESTIGATION INCLUDED ANALYSIS OF MANUFACTURER AND AGENCY INCIDENT REPORTS, REVIEW OF POLICE REPORTS, ANALYSIS OF THE AGENCY'S FATAL ANALYSIS REPORTING SYSTEM, A VEHICLE OWNER SURVEY, INSPECTION OF TOW VEHICLES/HITCHES AND ANALYSIS OF FAILED PARTS.INCIDENTS OF WELD FAILURE WERE RARE AND ASSOCIATED WITH VERY LOW-SPEED DRIVING (TURNING, BACKING AND SUDDEN STOPPING).INCIDENTS OF BENDING WERE ASSOCIATED WITH IMPROPER TRAILER HITCH ADJUSTMENT OR OVERLOADING. A SAFETY-RELATED DEFECT HAS NOT BEEN IDENTIFIED AT THIS TIME AND FURTHER USE OF AGENCY RESOURCES DOES NOT APPEAR TO BE WARRANTED.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY WILL MONITOR THIS ISSUE AND RESERVES THE RIGHT TO TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.SEE DOCUMENT SEARCH FILE FOR ADDITION INFORMATION.
PE07025 · Trailer Hitch Receiver Failure
Opened May 14, 2007 · Closed Sep 14, 2007
Status: closed (inferred from source dates) · Trailer Hitches
GM PROVIDED ADDITIONAL DATA REGARDING ALLEGATIONS OF FAILURE OF THE TRAILER HITCH.ODI REVIEWED THAT AS WELL AS OTHER DATA PROVIDED BY PEER MANUFACTURERS.BASED ON OUR REVIEW, ODI FINDS THE NEED TO FURTHER INVESTIGATE THIS ISSUE.THIS PRELIMINARY EVALUATION IS UPGRADED TO AN ENGINEERING ANALYSIS (EA07-013) FOR FURTHER ASSESSMENT AND STUDY OF THIS ISSUE.
PE04004 · Hydraulic Pump Shaft Failures
Opened Jan 8, 2004 · Closed Apr 30, 2004
Status: closed (inferred from source dates) · Service Brakes, Hydraulic; Service Brakes, Hydraulic:power Assist; Service Brakes, Hydraulic:power Assist:hydraulic; Steering:hydraulic Power Assist System; Steering:hydraulic Power Assist:pump
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Additional source detail variants (5)
Service Brakes, Hydraulic
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Service Brakes, Hydraulic:power Assist
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Service Brakes, Hydraulic:power Assist:hydraulic
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Steering:hydraulic Power Assist:pump
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Steering:hydraulic Power Assist System
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.