AA Ignition Throttle Position Sensor (TPS) for Dodge Ram 2500/3500 5.9L Cummins 1998-2004 — Direct-Fit, Vibration-Resistant

AA Ignition's Throttle Position Sensor (TPS) is a direct-fit replacement that restores accurate accelerator position feedback for Dodge Ram 2500 and 3500 5.9L Cummins trucks from 1998–2004.

If your Ram is showing unstable idle, sudden loss of speed, or diagnostic codes like P0121, P0122, P0123 or P2121, the TPS mounted on the bell crank assembly could be the culprit. This aftermarket AA Ignition unit replaces multiple OE numbers and is built with a redesigned housing and circuit board to resist vibration and temperature extremes while matching factory fit and function.

How does this TPS restore throttle response and drivability?

Replacing a faulty TPS gives the engine control module correct information about where the accelerator pedal is positioned, which helps smooth idle, eliminate unexpected rpm drops and clear related error codes. The AA Ignition unit provides the same electrical output characteristics as the original so the ECM can make proper fueling and timing decisions.

• Restores accurate voltage feedback to the ECM for throttle position
• Helps resolve idle instability and intermittent power loss
• Addresses common fault codes tied to throttle/pedal position sensing

Will this part fit my Dodge Ram with the 5.9L Cummins engine?

This TPS is designed to replace the factory sensor for Ram 2500 and 3500 models equipped with the 5.9L Cummins engine from model years 1998 through 2004. It replaces a variety of OE and aftermarket numbers, so it covers many original sensor revisions used across those years.

• Compatible with 1998–2004 Dodge Ram 2500 and 3500 5.9L Cummins
• Direct replacement for AP63427, AP63428 and multiple OE numbers
• Works for trucks showing P0121, P0122, P0123, or P2121 codes

How do I install and calibrate the AA Ignition TPS?

Installation is straightforward: the sensor mounts in the bell crank housing on the driver side near the front of the engine and electrical connections match factory plugs. Before final tightening the sensor's output voltage should be set to approximately 0.55 volts; after installation run the engine and slowly depress the accelerator to the floor and back once so the ECM can relearn the new sensor position.

• Mounts in the bell crank assembly at front driver side of engine
• Set idle/reference voltage to ~0.55 V prior to locking sensor
• Perform a single full pedal stroke with engine on for ECM learning

What quality and warranty can I expect from this aftermarket TPS?

Although not an original equipment manufacturer part, this AA Ignition sensor is engineered to match OEM fit and performance and features a tougher housing and circuit board to withstand heat and vibration. The company backs the unit with a lifetime warranty, offering replacement should the part fail under normal use.

• Redesigned housing and circuit board for improved durability
• Direct-fit form, fit and function for easy replacement
• Lifetime warranty for long-term assurance

Who is this for: This AA Ignition Throttle Position Sensor is intended for Dodge Ram 2500 and 3500 owners (1998–2004) with the 5.9L Cummins engine who are troubleshooting throttle-related faults, erratic idle, or ECM codes tied to pedal/position sensors. It’s a practical, cost-saving replacement for mechanics, DIY truck owners, and fleet technicians seeking an OEM-style fit with improved durability and warranty coverage.