Fuel system, diesel: pre-heaterRecall 26V-603 · 2026–2027 Dynamax Grand Sport GT
Forest River, Inc. recall 26V-603 covers 16 2026–2027 Dynamax Grand Sport GT for a fuel system, diesel: pre-heater problem, reported to NHTSA on September 21, 2026.
Source: NHTSA recall 26V603000 and manufacturer quarterly reports. Started by the manufacturer.
The problem
Forest River, Inc (Forest River) is recalling certain 2026-2027 Dynamax Grand Sport GT recreational vehicles. The engine pre-heat pump may have been improperly installed, causing the coolant hose to fail.
The risk
A coolant hose failure can cause the engine to overheat, increasing the risk of a crash.
The fix
Dealers will re-pin the wiring harness, re-route the coolant hoses, and replace parts as necessary, free of charge. Owner notification letters were mailed October 20, 2026. Owners may contact Forest River customer service at 1-574-522-1583. Forest River's number for this recall is 40-2097.
Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.
Vehicles in this recall
Built from December 24, 2025 to July 31, 2026. Not every vehicle in these model years is included; check by VIN.