NHTSA Office of Defects Investigation
Engineering Analysis EA23-003: Momentary Increased Steering Effort
- Closed
NHTSA's Office of Defects Investigation opened Engineering Analysis EA23-003 on November 29, 2023 and closed it on January 28, 2025. NHTSA's investigations file lists 6 models from 2 makes for it and links recall 24V-744 to it.
Updated daily from NHTSA's investigations file
Key facts
- NHTSA number
- EA23-003 (also written EA23003)
- 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 January 28, 2025
- Opened
- Closed
- Vehicle or equipment manufacturer
- Honda (American Honda Motor Co.)
- Component
- Steering
- Recall linked by NHTSA
- 24V-744: Difficulty Steering from Steering Gearbox Damage, reported
- Vehicles and equipment
- 6 models from 2 makes, including the Honda Civic and Acura Integra
NHTSA's summary
As NHTSA's Office of Defects Investigation wrote it for Engineering Analysis EA23-003.
try.vin does not copy NHTSA's investigation documents; NHTSA's investigation record lists the ones NHTSA has published.
On November 29, 2023, the Office of Defects Investigation (ODI) opened this Engineering Analysis (EA23003) to assess allegations of momentary increase in steering effort in model years (MY) 2022-2023 Honda Civic, 2023MY Honda CR-V, and 2023MY Acura Integra vehicles (subject vehicles). The complaints received by ODI alleged that the subject vehicles experienced a momentary increase in required steering effort (described as “sticky steering”) occurring mostly at highway speeds after driving for an extended amount of time; these complaints could not be duplicated during dealer service technicians’ quick test drives. The complaints had been received over the previous two years with most occurring with low vehicle mileage. The steering gear of these vehicles is aided by an electrical power assist unit. This power assist unit inputs force on the steering rack via a worm gear and worm wheel assembly. During PE23005, Honda stated this condition of momentary increase in steering effort occurs due to two factors within this power assist unit. First, during manufacturing, the steering worm wheel goes through annealing and component conditioning processes. These processes cause internal stress and strain within the steering worm wheel. This strain is slowly released over the first few months of the vehicle life. Over time, the released strain causes deformation of the teeth on the worm wheel, causing the worm gear to catch on the worm wheel. This catching results in the driver’s momentary increased steering effort. Second, the manufacturing process did not guarantee consistent grease application and, therefore, some subject vehicles received insufficient grease which contributed to the momentary increase in steering effort. During EA23003, ODI further analyzed the potential safety related consequences of the momentary increase in steering effort. NHTSA’s Vehicle Research and Test Center (VRTC) duplicated the allegations of increased steering effort. In addition, VRTC discovered the steering worm wheel and worm gear tended to push grease out of the meshing area, resulting in large amounts of grease resting on top of the worm wheel. Information Request responses collected and reviewed by ODI showed Honda had also discovered this additional root cause during NHTSA’s EA. In addition, Honda discovered the preload of the worm wheel gear spring was set too high, increasing the gear slide load and resulting in higher friction and increased torque fluctuation when steering. The number of consumer complaints made to ODI continued to increase with the expansion of scope from the PE to the EA. Additionally, during EA23003, ODI received ten complaints alleging a crash, in addition to the 13 complaints ODI had received as of the time it opened EA23003. In total, 23 crashes have been reported to ODI due to this alleged defect. On October 3, 2024, Honda filed NHTSA Recall No. 24V-744 to address this defect. The recall will provide consumers with a new steering worm wheel gear spring with a decreased load. Additionally, dealerships will add additional grease and relocate any grease sitting on top of the worm wheel back into the meshing area. The scope of this recall includes all Honda vehicles that were manufactured with this specific improperly produced steering worm wheel and spring. In view of the recall action being taken by Honda, ODI is closing EA23003. NHTSA reserves the right to take additional action if warranted by future circumstances. To review the ODI reports cited in the Closing Resume ODI Report Identification Number document, go to NHTSA.gov.
Vehicles and equipment listed for this investigation
NHTSA's investigations file lists these vehicles and equipment for Engineering Analysis EA23-003. 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.
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.
Free VIN check: decode a VIN to see its year, make and model.
Sources
NHTSA's investigation record for EA23-003
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.