The P2135 code indicates that the engine control module (ECM) has detected a mismatch between the voltage signals of Throttle Position Sensor (TPS) A and TPS B (image below). These dual sensors work ...
When your Cummins goes into limp mode (aka low-power mode or safe mode), it's the truck's way of telling you something's wrong, while still letting you crawl to safety. It restricts speed and power to ...