Alliant AP63458 APPS Sensor for 98–04 Dodge 5.9L Cummins

Alliant Power AP63458 is built as a high‑quality replacement for the factory APPS used on 1998–2002 VP44 and 2003–2004 250/305 hp common‑rail 5.9L Cummins trucks. Mounted on the driver side of the engine under the intake horn, this sensor converts accelerator pedal movement into a precise voltage signal that your ECM uses to control fueling and response. When the original sensor wears out, common issues include intermittent throttle, loss of response, and erratic idle that are often misdiagnosed as fueling problems. Installing AP63458 lets you retain your existing APPS bracket and bellcrank assembly while restoring proper pedal feel and drivability at a lower cost than a full assembly.​

Fitment and applications

• 1998–2003 Dodge Ram 2500/3500 5.9L Cummins ISB with VP44, auto or manual.​

• 2003–2004 Dodge Ram 2500/3500 5.9L Cummins ISB common rail (selected 250/305 hp trucks), auto or manual.​

Notes: For trucks using the APPS mounted under the intake horn on the driver side; not for drive‑by‑wire pedal assemblies.​

Key benefits

• Improved drivability with smooth, predictable throttle response and better low‑speed control.​

• Eliminates dangerous dead pedal situations when towing, merging, or off‑road.​

• Reduces nuisance check engine lights tied to throttle position faults.

• Sensor‑only design keeps replacement cost down when bracket/housing are still good.​

Symptoms and possible trouble codes

Common signs your AP63458‑type APPS is failing include:​

• Intermittent or complete dead pedal (no response to throttle).

• Surging, bucking, or random high/low idle.

• Throttle that “falls on its face” while cruising.

• Check engine light with APPS/APP/TPS codes such as P2121, P2122, P2123, P0121–P0123, or similar accelerator pedal/throttle position circuit DTCs (exact codes vary by year and scan tool).​

Warranty

Alliant Power supplies AP63458 as a new (not reman) sensor backed by a 2 year limited warranty against defects in materials and workmanship​

FAQs

Q: What trucks does AP63458 fit?
A: It fits 1998–2003 VP44 and 2003–2004 5.9L ISB common‑rail Dodge Ram 2500/3500 with the APPS mounted under the intake horn on the driver side, both automatic and manual transmissions.​

Q: Is this the whole APPS assembly with bracket and bellcrank?
A: No, AP63458 is the sensor only; it reuses your existing bracket and bellcrank assembly, which must be in good condition.​

Q: Do I need to adjust or calibrate the sensor?
A: The sensor is built to OE spec, but proper voltage setup and ECM relearn are recommended; many install procedures specify setting idle voltage, typically .55-.58V range using a voltmeter or scan tool.​

Q: Will this fix my truck stalling or cutting out?
A: If your issues stem from a failing APPS (dead pedal, APP‑related codes, or erratic sweep), replacing it often resolves the problem; however, fuel system or wiring issues must also be ruled out.​

Q: Is this a genuine Alliant Power part?
A: Yes, AP63458 is a brand‑new Alliant Power accelerator pedal position sensor, supplied in Alliant packaging with current production support.

This product fits the following vehicle configurations: