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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.

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When problems were reported

Mileage at the reported incident

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

Engine And Engine Cooling complaints

11 reports
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Mileage unknown · Oct 14, 2011
Engine And Engine CoolingFuel System, Gasoline

2002 GMC SIERRA 2500HD. CONSUMER STATES PROBLEM WITH VEHICLE ENGINE *TGW THE CONSUMER STATED THE ENGINE WOULD SHUT DOWN WHILE DRIVING, LOOSING ALL POWER TO THE STEERING AND BRAKES, AND COULD NOT BE STARTED AGAIN, UNTIL THE TRUCK WAS PUT IN PARK AND THE KEY REMOVED FROM THE IGNITION. THERE WERE ALSO TIMES, WHEN THE TRUCK WOULD N…

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2002 GMC SIERRA 2500HD. CONSUMER STATES PROBLEM WITH VEHICLE ENGINE *TGW THE CONSUMER STATED THE ENGINE WOULD SHUT DOWN WHILE DRIVING, LOOSING ALL POWER TO THE STEERING AND BRAKES, AND COULD NOT BE STARTED AGAIN, UNTIL THE TRUCK WAS PUT IN PARK AND THE KEY REMOVED FROM THE IGNITION. THERE WERE ALSO TIMES, WHEN THE TRUCK WOULD NOT START AT ALL. THE DEALER KEPT THE TRUCK FOR THREE WEEKS AND THEY WERE UNABLE TO DUPLICATE THE PROBLEM. WHEN THE CONSUMER PICKED THE TRUCK UP AND DROVE 10 MILES, IT SHUT DOWN AGAIN. THE CONSUMER BELIEVED THE PROBLEM WAS FUEL RELATED. *JB

NHTSA ODI #10429908

123,500 miles · Jan 12, 2011
Engine And Engine Cooling

I HAVE A GMC 2500HD 4X4 WITH THE 8.1 LITER ENGINE IN THE PAST YEAR IT HAS STALLED AND THEN RESTARTED ITSELF 5 OR 6 TIMES ONE TIME I HAD TO SIT FOR ABOUT 6 MINUTES BEFORE IT WOULD RESTART. *TR

NHTSA ODI #10376422

90,000 miles · Aug 12, 2009
Engine And Engine Cooling

I HAVE A 2002 GMC SIERRA 2500HD WITH THE 8.1L ENGINE THAT IS EXHIBITING THE EXACT SAME SYMPTOMS THAT LED TO THE RECALL OF THE 2001 MODEL. (NHTSA # 07V521000). ONE MINUTE I'LL BE DRIVING DOWN THE FREEWAY AND THE NEXT MINUTE THE ENGINE WILL STOP RUNNING. THIS HAS HAPPENED NUMEROUS TIMES. SOMETIMES IT'LL RESTART BEFORE IT COMES TO …

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I HAVE A 2002 GMC SIERRA 2500HD WITH THE 8.1L ENGINE THAT IS EXHIBITING THE EXACT SAME SYMPTOMS THAT LED TO THE RECALL OF THE 2001 MODEL. (NHTSA # 07V521000). ONE MINUTE I'LL BE DRIVING DOWN THE FREEWAY AND THE NEXT MINUTE THE ENGINE WILL STOP RUNNING. THIS HAS HAPPENED NUMEROUS TIMES. SOMETIMES IT'LL RESTART BEFORE IT COMES TO A STOP. SOMETIMES IT WILL TAKE SEVERAL MINUTES AFTER IT'S COME TO A STOP. I'VE RESEARCHED IT ON-LINE, AND IT WOULD APPEAR THAT THIS PROBLEM IS NOT RESTRICTED TO THE 2001 MODELS. THE DATE I'VE LISTED IS WHEN I FIRST REMEMBER IT HAPPENING. IT'S VERY INTERMITTENT. IT'S GETTING WORSE. *TR

NHTSA ODI #10280204

74,000 miles · Jul 26, 2009
Engine And Engine Cooling

2002 GMC SIERRA 2500HD 6.0L 4X4. THE 6.0L ENGINE IS KNOCKING CONSTANTLY, AND FROM DOING SOME RESEARCH. THIS IS A VERY COMMON ISSUE AND NEEDS TO BE RESOLVED. DEALER SAID IT IS NORMAL! SINCE WHEN IS AN ENGINE KNOCKING, NORMAL? *TR

NHTSA ODI #10278312

20,000 miles · Mar 30, 2009
Engine And Engine Cooling

TRUCK WAS STALLING MAYBE THREE TIMES A YEAR APPROX. 3 YEARS AGO. DOESN'T REGISTER ANY CODES. APPROX. 1 MONTH AGO STARTED STALLING DAILY. *TR

NHTSA ODI #10263600

52,000 miles · Jul 2, 2008
Engine And Engine Cooling

I HAVE A 2002 GMC SIERRA 2500HD PICKUP WITH THE VORTEC 8.1 ENGINE. I AM EXPERIENCING THE SAME CRANK POSITION SENSOR FAILURE AS EXPERIENCED IN THE 2001 MODEL YEAR RECALL (SAFETY RECALL # 06083). I AM NOT ALONE, AS MANY MANY OTHERS ARE HAVING THE SAME ISSUES IN THEIR 2002-2004 PICKUP TRUCKS. I BELIEVE THE NHTSA SHOULD EXTEND SAFET…

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I HAVE A 2002 GMC SIERRA 2500HD PICKUP WITH THE VORTEC 8.1 ENGINE. I AM EXPERIENCING THE SAME CRANK POSITION SENSOR FAILURE AS EXPERIENCED IN THE 2001 MODEL YEAR RECALL (SAFETY RECALL # 06083). I AM NOT ALONE, AS MANY MANY OTHERS ARE HAVING THE SAME ISSUES IN THEIR 2002-2004 PICKUP TRUCKS. I BELIEVE THE NHTSA SHOULD EXTEND SAFETY RECALL # 06083 TO INCLUDE MODEL YEARS 2002 TO 2004, AS SOME MODELS MANUFACTURED IN CANADA FREQUENTLY USE PARTS FROM PREVIOUS US MODEL YEARS. MY VEHICLE IS NOT SAFE TO OPERATE ON THE HIGHWAYS AS A RESULT. PLEASE ADVISE. *TR

NHTSA ODI #10232980

43,000 miles · May 10, 2007
Engine And Engine Cooling

BATTERY LIGHT CAME ON IN MESSAGE CENTER AND ENGINE CUT OFF, DISABLING STEERING AND BRAKES. NEARLY AVOIDED ACCIDENT ON HIGHWAY AS VEHICLE HAD TO CUT OVER TO LANES INTO DIRT SHOULDER TO STOP. VE CRANKSHAFT SENSOR HAD TO BE REPLACED, AND A NEW DIAGNOSTIC CODE ENTERED IN THE VEHICLE. FOUND 3 OTHER ODI'S WITH EXACT SAME PROBLEM, 1…

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BATTERY LIGHT CAME ON IN MESSAGE CENTER AND ENGINE CUT OFF, DISABLING STEERING AND BRAKES. NEARLY AVOIDED ACCIDENT ON HIGHWAY AS VEHICLE HAD TO CUT OVER TO LANES INTO DIRT SHOULDER TO STOP. VE CRANKSHAFT SENSOR HAD TO BE REPLACED, AND A NEW DIAGNOSTIC CODE ENTERED IN THE VEHICLE. FOUND 3 OTHER ODI'S WITH EXACT SAME PROBLEM, 10159068,10174007, AND 10164369.*AK

NHTSA ODI #10190418

32,000 miles · Nov 21, 2006
Engine And Engine CoolingPower Train

DT*: THE CONTACT STATED THE VEHICLE STALLED WHILE IN GEAR ON FOUR OCCASIONS. THE VEHICLE HAD NOT BEEN TO A SERVICE DEALER TO RESOLVE THE ISSUE. THE CONTACT EXPRESSED CONCERN THAT THIS WAS A DEFECT.*AK THE CRANKSHAFT POSITION SENSOR WAS REPLACED. UPDATED 12/15/06. *JB

NHTSA ODI #10174007

40,000 miles · Sep 26, 2006
Engine And Engine Cooling

DT*: THE CONTACT STATED THE VEHICLE STALLED WHILE IN GEAR OR IN THE IDLE POSITION. THIS WAS A CONSISTENT PROBLEM FOR OVER ONE AND A HALF YEARS. THE VEHICLE WAS TAKEN TO THE SERVICE DEALER IN APRIL AS WELL, AND THE PROBLEM COULD NOT BE IDENTIFIED.

NHTSA ODI #10169358

57,778 miles · Aug 3, 2006
Engine And Engine CoolingPower TrainService Brakes, Hydraulic

DT*: THE CONTACT STATED THE VEHICLE STALLED ON THREE OCCASIONS. ALL INCIDENTS OCCURRED DURING ACCELERATION WHILE TRAVELING 25 TO 35 MPH. THERE WERE NO WARNINGS PRIOR TO THE INCIDENTS AND THE VEHICLE HAD NO PROBLEMS RESTARTING. THE DEALER COULD NOT DUPLICATE OR RESOLVE THE PROBLEM. *AK UPDATED 11/16/2006 - THERE WERE SUBSEQU…

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DT*: THE CONTACT STATED THE VEHICLE STALLED ON THREE OCCASIONS. ALL INCIDENTS OCCURRED DURING ACCELERATION WHILE TRAVELING 25 TO 35 MPH. THERE WERE NO WARNINGS PRIOR TO THE INCIDENTS AND THE VEHICLE HAD NO PROBLEMS RESTARTING. THE DEALER COULD NOT DUPLICATE OR RESOLVE THE PROBLEM. *AK UPDATED 11/16/2006 - THERE WERE SUBSEQUENT PROBLEM RESTARTING THE VEHICLE, AND AS MANY AS 3 TO 5 STALLING EPISODES PER WEEK. NOT ALL INCIDENTS OCCURRED WHILE TRAVELING. SOME INCIDENTS OCCURRED WHILE AT IDLE, AND AT A STOP. COMPLETE LOSS OF POWER STEERING AND BRAKES OCCURRED WHEN THE VEHICLE STALLED. THE DEALER DIAGNOSED THE PROBLEM AS A FAULTY CRANKSHAFT SENSOR AND REPLACED IT. RECENTLY THE CHECK ENGINE LIGHT HAS ILLUMINATED. THE DEALER DIAGNOSED THE PROBLEM AS A FAULTY TRANSMISSION SELECTOR POSITION SENSOR AND REPLACED IT. THE ABS ACTIVATED WHILE DRIVING ON DRY PAVEMENT. THE DEALER FOUND IT NECESSARY TO REPLACE BOTH FRONT ABS WHEEL SPEED SENSORS. *NM

NHTSA ODI #10164369

Official recalls

1

01V220000 · 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

3

EA07013 · 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.