Theory of Operation
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic tests for a stuck throttle or throttle position sensor. The algorithm only runs when detected throttle position is above 8% and maintains a position within 2% for more than two seconds. If the brake pedal is pushed during that time, the diagnostic will fail. This fault will not occur if the brake pedal is applied first and then the throttle pedal is engaged. If this diagnostic runs and fails the Powertrain Control Module (PCM) will light a momentary ETC lamp. The ETC lamp will only be active when the condition exists. While the error is active the customer will likely experience a throttle derate. The throttle position must be below 8% with both brake switches off in order for this error to reset.