DTC P1551: Incorrect At-Rest Throttle Position: Description

The Engine Control Module (ECM) controls the throttle blades by applying a varying voltage to the throttle valve motor. The ECM monitors the actual throttle blade Position Using Throttle Position (TP) sensor 1 and 2. If the ECM detects the throttle position outside the desired throttle range for the rest position, DTC P1551 sets.