Limp mode, also known as limp home mode, is a feature in all trucks, which activates once the vehicle’s ECU detects a fault. In trucks, this happens mostly due to a fault with emissions control system. So it may be a failure of one or more SCR system components, NOx sensors, DPF or anything else within the emissions control system. Once fault is detected, ECU will give you a certain number of hours/miles/starts before limp mode kicks in. When it does, the engine’s power will be limited until the fault in question is rectified.

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