NHTSA Office of Defects Investigation

Preliminary Evaluation PE08-045: TRANSMISSION HOSE LEAK

Closed

NHTSA's Office of Defects Investigation opened Preliminary Evaluation PE08-045 on July 23, 2008 and closed it on October 24, 2008. NHTSA's investigations file lists the 2007–2008 Nissan Maxima for it.

Updated daily from NHTSA's investigations file

Key facts

NHTSA number: PE08-045 (also written PE08045)
Investigation type: Preliminary Evaluation The first stage of most defect investigations: NHTSA's Office of Defects Investigation gathers basic information about a possible safety defect, including from the manufacturer.
Status: Closed October 24, 2008
Opened: July 23, 2008
Closed: October 24, 2008
Vehicle or equipment manufacturer: Nissan North America, Inc.
Components: Power Train — Automatic Transmission; Power Train — Automatic Transmission — Cooling Unit and Lines
Vehicles and equipment: 2007–2008 Nissan Maxima

A recall appears here only when NHTSA's investigations file links one to the investigation; NHTSA's summary or record can name others.

NHTSA's summary

As NHTSA's Office of Defects Investigation wrote it for Preliminary Evaluation PE08-045.

THIS PE WAS OPENED FOR MODEL YEAR (MY) 2008 NISSAN MAXIMA VEHICLES BASED ON EARLY WARNING DATA THAT THE AUTOMATIC TRANSMISSION COOLER HOSE MAY HAVE PINHOLES AND/OR CRACKS RESULTING IN A TRANSMISSION FLUID LEAK.THE LEAKED FLUID CAN CONTACT THE EXHAUST SYSTEM AND IGNITE.NISSAN HAS SHOWN THAT THE ROOT CAUSE OF THE PINHOLES AND/OR CRACKS IN THE HOSE IS EXCESSIVE STRESS DURING THE MANUFACTURE FORMING PROCESS RESULTING IN HOSE DEFORMATION AT LOADING ONTO A MANDREL, OR DAMAGE DURING UN-LOADING.REGARDING LOADING STRESS, NISSAN STATES, WHEN EXCESSIVE STRESS IS APPLIED WHILE LOADING THE HOSE ONTO THE MANDREL, HOSE DEFORMATION (WHICH LOOKS LIKE A BULGE) CAN OCCUR AROUND THE BENDING AREA.A CRACK WILL START TO FORM ON THE INSIDE OF THE HOSE AT THE AREA OF DEFORMATION.REGARDING UNLOADING STRESS, NISSAN STATES, AFTER THE CURING PROCESS, IN SOME INSTANCES THE HOSE STUCK TO THE MANDREL TIGHTLY AND THE OPERATOR HAD TO APPLY A SIGNIFICANT AMOUNT OF FORCE TO PULL THE HOSE FROM THE MANDREL.IF THIS OPERATION WAS PERFORMED ROUGHLY, THE INTERIOR OF THE HOSE COULD BE DAMAGED BY THE MANDREL EDGE. NISSAN ALSO STATES, BECAUSE OF THE WAY THE HOSES RECEIVED INTERNAL DAMAGE, A DAMAGED HOSE WAS PRODUCED AS A RARE, RANDOM EVENT RATHER THAN SYSTEMATICALLY.THE TRANSMISSION HOSE SUPPLIER, COOPER STANDARD AUTOMOTIVE, IMPLEMENTED PROCESS IMPROVEMENTS THAT LIMIT EXCESSIVE STRESS ON THE HOSE DURING MANUFACTURE. NISSAN HAS SHOWN THAT THIS TRANSMISSION COOLER HOSE WAS ASSEMBLED ON MY 2007 AND MY 2008 MAXIMA VEHICLES.NISSAN REDESIGNED THE TRANSMISSION COOLER HOSE ON MY 2009 MAXIMA, AND THE HOSE IS MANUFACTURED BY A NEW SUPPLIER.NISSAN HAS ALSO SHOWN THAT THE LEAKS MOSTLY OCCUR WITHIN THE FIRST 2000 MILES OF SERVICE WITH A SEVERE DROP IN INCIDENTS BEYOND 2000 MILES OF SERVICE.MOST LEAKS HAVE ALREADY OCCURRED, AND THE ONE FIRE WAS MINOR. 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 NO SAFETY-RELATED DEFECT EXISTS.THE AGENCY RESERVES THE RIGHT TO TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.

Vehicles and equipment listed for this investigation

NHTSA's investigations file lists these vehicles and equipment for Preliminary Evaluation PE08-045. 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.

Nissan

Nissan Maxima
- 2007, 2008

All Nissan 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.

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

Sources

NHTSA's investigation record for PE08-045

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.