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NHTSA Office of Defects Investigation

Engineering Analysis EA05-021: THROTTLE CONTROL MALFUNCTION

  • Closed

NHTSA's Office of Defects Investigation opened Engineering Analysis EA05-021 on December 6, 2005 and closed it on December 12, 2006. NHTSA's investigations file lists 13 Volvo models for it and links recall 06V-441 to it.

Updated daily from NHTSA's investigations file

Key facts

NHTSA number
EA05-021 (also written EA05021)
Investigation type
Engineering Analysis A more detailed stage of a defect investigation, opened when NHTSA's Office of Defects Investigation decides an issue merits further review, often after a Preliminary Evaluation or a Recall Query; it can include vehicle testing, surveys and further information requests.
Status
Closed December 12, 2006
Opened
Closed
Vehicle or equipment manufacturer
Volvo Car USA, LLC
Component
Vehicle Speed Control
Recall linked by NHTSA
  • 06V-441: THROTTLE CONTROL MALFUNCTION, reported
Vehicles and equipment
13 Volvo models, including the S60 and V70

NHTSA's summary

As NHTSA's Office of Defects Investigation wrote it for Engineering Analysis EA05-021.

ON NOVEMBER 14, 2006 VOLVO SUBMITTED A DEFECT INFORMATION REPORT TO NHTSA CONCERNING ETM FAILURES IN MODEL YEAR (MY) 1999 THROUGH 2001 VOLVO MODELS (NOT INCLUDING THE S40 AND V40), MY 2002 S60 AND V70 WITH NATURALLY ASPIRATED ENGINES AND MY 2002 V70S.ACCORDING TO VOLVO, ?A COMBINATION OF THROTTLE POSITIONING SENSOR IRREGULARITIES, A DIRTY THROTTLE HOUSING AND/OR INEFFICIENT SOFTWARE CALIBRATION MAY CAUSE A WARNING LAMP TO LIGHT AND THE SUBSEQUENT ONSET OF LIMP HOME MODES.VOLVO FURTHER STATED THAT,THIS RESULTED IN A HIGH NUMBER OF THESE VEHICLES GOING INTO LIMP HOME MODE WITHOUT NEED.?VOLVO INDICATED THAT THIS WAS THE MOST SEVERE CONSEQUENCE OF AN ETM FAULT IN THE SUBJECT VEHICLES.THE RECALL REMEDY IS A SOFTWARE UPGRADE INTRODUCED BY VOLVO ON MARCH 16, 2006 IN A CUSTOMER SATISFACTION PROGRAM.AT THE TIME OF THE NOTIFICATION 161,202 VEHICLES OF THE POPULATION OF 331,301 HAD ALREADY HAD THE SOFTWARE UPLOADED AND WERE THEREFORE NOT INCLUDED IN THE POPULATION COUNT OF THE RECALL. ODI?S ANALYSIS OF COMPLAINTS TO ODI AND VOLVO, VOLVO FIELD REPORTS AND WARRANTY DATA FOUND THAT ETM FAILURE COULD RESULT IN (1) ENGINE STALL; (2) MECHANICAL LIMP MODE; (3) LUNGING FORWARD DURING LOW-SPEED DRIVING MANEUVERS; AND (4) FALTERING DURING HIGH SPEED MERGES OR WHEN CROSSING TRAFFIC.ODI IDENTIFIED 12 CRASHES RELATED TO ETM FAILURE, WITH 6 CAUSED BY LUNGING INCIDENTS, 3 CAUSED BY STALLING INCIDENTS, 2 CAUSED BY MECHANICAL LIMP MODE AND 1 FROM THE FALTERING CONDITION.ODI'S ANALYSIS OF COMPLAINT DATA AND INFORMATION OBTAINED FROM CONSUMER INTERVIEWS IDENTIFIED 1,289 INCIDENTS WITH SAFETY RELATED CONSEQUENCES (389.1 PER 100,000 VEHICLES), INCLUDING 479 INVOLVING ENGINE STALL (144.6 PER 100,000 VEHICLES) AND 729 INVOLVING MECHANICAL LIMP MODE (220.0 PER 100,000 VEHICLES).

ODI'S ANALYSIS OF WARRANTY CLAIM NARRATIVE TEXT SHOWS AT LEAST 14,965 WARRANTY CLAIMS WITH CODES INDICATING AN ETM FAULT RESULTING IN VEHICLE OPERATION IN MECHANICAL LIMP MODE (4.5% OF THE SUBJECT VEHICLES). VOLVO?S RECALL ADDRESSES ODI?S SAFETY CONCERNS WITH ETM FAILURES.ODI WILL CONTINUE TO MONITOR THE SUBJECT VEHICLES TO DETERMINE IF ADDITIONAL ACTION IS REQUIRED.THIS ENGINEERING ANALYSIS IS CLOSED.

Vehicles and equipment listed for this investigation

NHTSA's investigations file lists these vehicles and equipment for Engineering Analysis EA05-021. A listed model year means only that an investigation names it; it says nothing about any particular vehicle. Model years with a try.vin recall page link to that page's NHTSA investigations section.

Volvo

All Volvo recalls

What an NHTSA investigation is

NHTSA's Office of Defects Investigation (ODI) looks into possible safety defects in vehicles and equipment, often after owner complaints. An investigation usually starts as a Preliminary Evaluation, or as a Recall Query when it concerns whether an existing recall covers the right vehicles or fixes the problem, and ODI can upgrade it to a more detailed Engineering Analysis. A Defect Petition asks NHTSA to open an investigation, and Audit and Equipment Queries are administrative investigations into whether companies complied with federal vehicle safety requirements, such as reporting, recall and certification rules.

An open investigation is not a finding that a safety defect exists, and NHTSA can close one without a recall.

To see whether a specific vehicle has an open recall, enter its VIN at nhtsa.gov/recalls.

Volvo VIN check: decode a VIN to see its year, make and model.

Sources

NHTSA's investigation record for EA05-021

Investigation details come from NHTSA's investigations file, which try.vin imports once a day. The investigation types are described from the U.S. Department of Transportation Inspector General's May 2023 report on NHTSA's Office of Defects Investigation, NHTSA's petition rules (49 CFR Parts 552 and 557) and NHTSA's Office of Defects Investigation procedures. How try.vin reads NHTSA investigations.