Commonly reported mechanical problems with the Isuzu Rodeo include failures of the fuel pump, problems with the engine cooling system, transmission issues, failures of the brakes and braking system, and varnish build-up on the valve train. Customers reported these issues on Isuzu Rodeos during the course of the entire manufacturing production of the vehicle from 1992 through 2004. Another common issue is build-up of debris in the rear differential, leading to noise and differential failure.
Frequent stalling and running rough when the vehicle has been running for a long period of time usually indicates a problem with the engine cooling system. The vehicle tends to stall out while idling if this issue is occurring.
The Isuzu Rodeo's fuel pump system is known to develop small holes and leaks, which causes the vehicle to lose power on acceleration, show inconsistent fuel gauge readings, and issue smoke from the exhaust system.
The differential on the Isuzu Rodeo tends to run hot, which causes the differential fluid to break down. When this occurs, lubrication is not as consistent in key moving components of the rear axle, causing whining or whirring sounds while driving. If the fluid breaks down too much, the differential fails.