Defect Investigation Detail
FREIGHTLINER / CASCADIA / 2016
| Components - Details | |
|---|---|
| NHTSA Action Number: RQ20001 | Vehicale/Equipment Name: FREIGHTLINER |
| Vehicale/Equipment Model: CASCADIA | Vehicale/Equipment Year: 2016 |
| Component Name: ELECTRICAL SYSTEM | Manufacturer's Name: Daimler Trucks North America, LLC |
| Date Opened: Aug, 31 2020 | Date Closed: -- |
| Subject: SAM Cab Water Intrusion | Summary: On january 9, 2009, daimler trucks north america (dtna) issued recall 09v-024 on model year (my) 2007-2009 cascadia trucks for water intrusion into the signal-detect and activation (sam) chassis and cab modules resulting in potential electrical shorts that can affect lamp and lighting (tail, stop, side-marker lamps, trailer lighting) functions and possibly result in a fire hazard inside the truck's cabin. both modules have direct 12-volt power via the powernet distribution box (pndb). the recall remedy involves installing a new plastic drip shield between the sam cab module and the bulkhead, to prevent water intrusion from reaching the module.during the review of customer complaints (voq) and field reports (submitted by dtna through early warning reporting) related to sam cab electrical failures, the office of defects investigation (odi) found multiple reports and four (4) voq on model year 2007-present trucks alleging electrical failures and thermal events related to water intrusion affecting the sam cab module. some reports described repeated electrical failures, including fires with the ignition on or off. numerous reports indicate water had entered the cab through the windshield seals. two complainants alleged multiple repairs of the windshield seal did not prevent water intrusion into the sam cab module.in july 2019, dtna issued a technical service bulletin (tsb) 54-312 instructing technicians to replace the drip shield and the secondary cover on the sam cab module with a new one-piece drip shield.dtna claims the replacement was a product enhancement and would be a good modification when replacing any sam cab module. upon review of the tsb, odi became concerned the new replacement shield was intended to correct a problem with the shield installed as a remedy for recall 09v-024 and all new production trucks since the recall was announced. during discussions with dnta prior to the opening of this investigation, odi was made aware of additional claims, including some that described sam cab module failures on vehicles that had the remedy drip shield installed a part of the recall.odi is opening this rq to understand the failure modes that allow water intrusion into the sam cab module, the effectiveness of original recall remedy, and the installation of an updated drip-shield as it relates to continual water intrusion.the odi reports cited above can be reviewed at: http://www-odi.nhtsa.dot.gov/owners/searchnhtsaid using the following complaint identification numbers: 10780487, 10903504, 10983117, 11162468 |