Intermittent accelerator pedal response on your 2021 Ram 1500, accompanied by code P2122, indicates the ECM is periodically losing the proper signal from Accelerator Pedal Position Sensor D. This inconsistency creates dangerous and unpredictable throttle behavior.
The Intermittent Nature of P2122
Unlike a complete sensor failure, intermittent response suggests the sensor is functioning sometimes and failing other times. P2122 sets when APP Sensor D voltage drops below the expected threshold, which can happen momentarily during certain pedal positions or under specific conditions like vibration or temperature changes.
Common Causes of Intermittent Response
The 2021 Ram 1500's pedal issues typically stem from: worn internal contacts in the APP sensor that make intermittent connection, a loose connector that loses contact during road vibration, corroded pins that create high-resistance connections, damaged wiring that shorts intermittently, or a failing sensor that works only within certain voltage ranges.
Symptoms of Intermittent Failure
Owners describe: the truck accelerating normally one moment and not responding the next, sudden loss of throttle response during acceleration, the engine cutting power momentarily then resuming, the check engine light that may come and go, and the issue being worse on rough roads or in certain weather conditions.
Diagnostic Challenges
Intermittent problems require capturing the fault as it occurs. Technicians use scan tools to monitor APP Sensor D voltage continuously while road testing. They also wiggle test the connector and harness while watching for voltage dropouts. Freeze frame data showing when the fault set provides clues about conditions that trigger the failure.
Resolving Intermittent Response
Connector cleaning and re-seating resolves some intermittent cases. If the sensor itself is failing, accelerator pedal assembly replacement is required. For wiring issues, harness repair may be appropriate. After any repair, a thorough test drive under various conditions confirms the intermittent problem is resolved.