NHTSA Complaint #11709064 — 2021 MERCEDES-BENZ SPRINTER 2500

Following Jayco and Entegra instructions, I delivered my coach to Blue Compass RV. It has now been more than SIX MONTHS out of service. Jayco Pre-Authorization has denied the required battery replacement and referred me to the battery manufacturer, even though Entegra bulletins and recall procedures identify and correct the conditions that caused the damage. Completed Recall and TSB Work Approved by Entegra and Jayco · 22-075 (TSB) A/C Electrical Connection Instructions, September 2022. Replaces WAGO connectors. · 22-076 (TSB) Firefly Terminator G4 Tap Connector, September 2022. Corrects communication errors within the lithium battery network. · 23-101 (TSB) Front Spotlight Electrical Update, April 2023, revised September 2023. Mitigates spotlight over current that can affect Firefly. Adds harness, relay, and software. · 23-120 (TSB) Renogy Inverter Settings, November 2023. Updates parameters; requires Battery Type = LF16 and custom set points. · 23-123 (TSB) Alternator Fuse Replacement, December 2023. Replaces 300 A MRBF with 200 A MRBF. Confirms alternator charging 30 to 100 A on Samkoon. · 24-015 (TSB) Renogy Battery Firmware Update, September 2024. Updates BMS to v137.4.5 to address alternator not charging the battery. Includes state-of-charge calibration. · 24V-160 / 2024-141 (Recall) Renogy Lithium Battery Firmware Update, May 2024, revised August 2024. Recall firmware to v137.4.4. Inspection identifies stuck contactors and requires battery replacement when found. Service bulletins 23-120, 23-123, and 24-015 show that the system ran with outdated inverter and alternator settings, an oversized alternator fuse, and battery firmware that interfered with proper charging. These factors accelerate cell imbalance and degradation. Only after Entegra-approved updates were applied did the full extent of battery degradation become evident. Replacing the battery earlier would have risked repeat failure.