Alliant AP63427 APPS Sensor for 98–03 Dodge 5.9L Cummins Manual Trans

Alliant Power AP63427 is engineered as an OE-style replacement accelerator pedal position sensor assembly for late 2nd‑gen and early 3rd‑gen Dodge Cummins trucks running the VP44 pump with a manual transmission. The integrated bellcrank converts pedal motion into precise sensor rotation, sending an accurate throttle position signal to the ECM and eliminating the guesswork of worn linkages and drifting sensors. This makes AP63427 ideal for work trucks, tow rigs, and daily drivers that demand consistent throttle response in traffic, on grades, and under heavy load. The assembly mounts in the factory location, interfaces with the stock harness, and is a popular upgrade when diagnosing intermittent throttle or “ghost” drivability problems related to the VP44 system.​

Fitment and applications

• 1998–2003 Dodge Ram 2500 5.9L Cummins ISB with VP44, manual transmission.​

• 1998–2003 Dodge Ram 3500 5.9L Cummins ISB with VP44, manual transmission.​

Notes: For use with VP44 pump engines and manual transmissions only; not for automatic-transmission trucks (use AP63428 instead).​

Key benefits

• Improved drivability with smooth, linear throttle input and better low-speed control.​

• Restores proper pedal-to-ECM communication on VP44 systems, reducing hesitation.

• Helps prevent unsafe dead pedal events when merging, towing, or off-road.

• Saves diagnostic time versus trying to recalibrate or reuse a failing OE APPS.

Symptoms and possible trouble codes

Common signs that the manual-trans APPS assembly needs replacement include:​

• Intermittent or total dead pedal (no throttle response).

• Surging, jerky acceleration, or random high idle.

• Cruise control cutting out unexpectedly.

• Check engine light with throttle/APPS-related DTCs such as P0121, P0122, P0123, or similar throttle position circuit codes (codes can vary by model year and scan tool).

Warranty and policies

Alliant Power backs AP63427 with a 2 year limited warranty against defects in materials and workmanship; coverage terms depend on current Alliant policy and the selling dealer. Normal exclusions apply for damage due to improper installation, wiring modifications, contamination, or misuse. ​

FAQs

Q: Will AP63427 fit an automatic-transmission truck?
A: No, AP63427 is for VP44 Cummins trucks with manual transmissions only; automatic trucks use a different APPS assembly such as AP63428.​

Q: What years does this cover?
A: It is commonly listed for 1998–2003 Dodge Ram 2500/3500 5.9L Cummins ISB with VP44 and a manual transmission.​

Q: Do I need to calibrate this APPS after installation?
A: Many units are built to OE spec, but best practice is to follow Cummins/Dodge APPS setup procedures or verify voltage and idle validation with a scan tool after install.​

Q: Can a bad APPS hurt my VP44 pump?
A: A failing APPS mainly causes drivability and safety concerns, but incorrect throttle signals can contribute to poor performance and should be resolved promptly.​

Q: Is this a genuine Alliant Power part?
A: Yes, AP63427 is an Alliant Power branded, new (not reman) accelerator pedal position sensor assembly with bellcrank, supplied ready for installation.

This product fits the following vehicle configurations: