Direct‑fit replacement for 1998–2003 Dodge Ram 5.9L ISB Cummins with VP44 pump.
OEM‑equivalent form, fit, and function with OE cross‑reference 4921601.
New (not reman) sensor for consistent, accurate crankshaft signal.
Helps cure hard starting, stalling, and random no‑start conditions related to CKP failure.
Built with durable materials to withstand heat, vibration, and harsh diesel environments.
Backed by Alliant Power’s 24‑month, unlimited‑mileage warranty when properly installed.
This Alliant Power AP63453 crankshaft position (CKP) sensor is designed specifically for 1998–2003 Dodge Ram applications using the 5.9L ISB Cummins engine with a VP44 injection pump, ensuring correct mounting depth and connector orientation for trouble‑free installation. By continuously monitoring crankshaft speed and position, the sensor supplies a critical input to the ECM so it can control injection timing, fuel delivery, and engine protection strategies.
The AP63453 is built to meet or exceed OEM specifications, providing an OE‑style plug‑and‑play connection and calibrated signal output to match the factory calibration. It cross‑references Cummins / OEM part number 4921601, making it an ideal replacement when dealer parts are unavailable or overpriced.
Confirmed fitment highlights:
1998–2003 Dodge Ram (2500/3500)
Engine: 5.9L ISB Cummins
Fuel system: VP44 injection pump
Always verify by year, engine, and OE number before ordering.
Alliant Power supports this sensor with a best‑in‑class 24‑month, unlimited‑mileage warranty, along with technical support for diagnostics and cross‑referencing when installed in approved applications. Warranty coverage generally requires proper installation, clean power/ground, and no evidence of contamination or harness damage.
Common symptoms of a failing CKP sensor may include:
Intermittent or complete no‑start condition
Hard starting, extended crank time, or random stalling while driving
Rough idle, engine misfires, or poor throttle response
Check Engine Light illuminated with CKP‑related DTCs
Possible related diagnostic trouble codes (DTCs) on many vehicles include:
P0335 – Crankshaft Position Sensor “A” Circuit
P0336 – Crankshaft Position Sensor Range/Performance
Always confirm codes and perform proper circuit and mechanical checks before condemning the sensor.
Q: Will this fit my 1998.5–2002 24‑valve Cummins with a VP44?
A: Yes, this AP63453 sensor is specified for Dodge 5.9L ISB Cummins applications from 1998–2003 using the VP44 injection pump; always confirm by VIN and OE number 4921601.
Q: Is this an OEM or aftermarket part?
A: This is a new Alliant Power sensor engineered as an OEM‑equivalent direct‑fit replacement that meets or exceeds original equipment standards.
Q: Do I need any special programming after installation?
A: On most 5.9L Cummins VP44 applications, the CKP sensor is plug‑and‑play with no ECU programming required, though clearing codes and verifying live data is recommended.
Q: What can void the warranty?
A: Improper installation, physical damage, contaminated connectors, wiring faults, or use outside listed applications can affect warranty eligibility; refer to Alliant Power’s official warranty terms for full details.
Q: Can a bad CKP sensor leave my truck stranded?
A: Yes, if the sensor fails completely, the ECM may lose crank signal, resulting in a crank‑no‑start or sudden stall that prevents the engine from restarting.
This product fits the following vehicle configurations:
| YEARS | VEHICLE MFG | ENGINE MFG | ENGINE | APPLICATION | NOTES | FOOTNOTES | ENGINE SERIAL NUMBER(S) | OEM CROSS-REFERENCE |
|---|---|---|---|---|---|---|---|---|
| 1998-2003 | Dodge | Cummins | ISB | with VP44 | N/A | 4921601 |
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