Product Description
Keep your second-gen 5.9L shifting and locking up the way Cummins intended with the CUMMINS 3930318 OEM THROTTLE POSITION SENSOR (TPS). This genuine sensor mounts to the throttle shaft on 1994–1998 Ram 2500/3500 5.9L 12-valve trucks and sends a precise throttle angle signal to the PCM. Correct TPS feedback is critical for smooth upshifts, proper torque converter lockup, and consistent throttle response on automatic-transmission 12-valves.
A worn or failing TPS can cause unpredictable gear changes, random torque converter lock/unlock, harsh part-throttle shifts, or no lockup at all. Replacing it with a factory-calibrated Cummins 3930318 position sensor restores OE shift quality so your 12-valve can pull hard, cruise smoothly, and respond cleanly to pedal input whether you daily drive, tow, or work the truck.
Key Features & Benefits
- Genuine Cummins 3930318 throttle position / accelerator position sensor – not an aftermarket copy.
- Direct-fit for 1994–1998 Dodge/Ram 2500 & 3500 trucks with 5.9L 12-valve Cummins and automatic transmission.
- Restores correct throttle signal to the PCM for proper upshifts, downshifts, and torque converter lockup.
- Helps eliminate random gear hunting, nuisance lock/unlock, and harsh part-throttle shifts.
- Built to Cummins OE durability standards for heat, vibration, and under-hood contamination.
- Engineered for a wide range of B-series, ISB, ISF, and QSB applications; drop-in for Ram 5.9L 12V trucks.
Fitment
This genuine Cummins TPS is used primarily on non-certified 5.9L B-series engines and is the OE sensor for the following Dodge/Ram truck applications:
- 1994–1998 Dodge/Ram 2500 – 5.9L 12-valve Cummins (automatic transmission)
- 1994–1998 Dodge/Ram 3500 – 5.9L 12-valve Cummins (automatic transmission)
Engine: 5.9L 12-Valve Cummins (6BT, B-series)
Location: Mounted on the throttle shaft / APPS bracket at the injection pump or throttle linkage, depending on model year.
Quantity: 1 sensor per vehicle.
Always confirm by VIN/ESN, connector style, and existing part number before ordering.
What This TPS Affects
- Automatic transmission shift timing and part-throttle shift quality.
- Torque converter lockup and unlock strategy under load and cruise.
- PCM/TCM perception of driver throttle demand and fueling ramp rate.
- Overall drivability, hill-hold performance, and towing manners.
When To Replace Your TPS
- Uncommanded downshifts from 4th to 3rd or random shift hunting at steady throttle.
- Intermittent or no torque converter lockup, or constant lock/unlock cycling.
- Surging or inconsistent throttle response as you roll into the pedal.
- Diagnostic trouble codes related to throttle position or APPS signal.
- High mileage with original TPS still installed on a 1994–1998 5.9L 12V truck.
Cross-Reference (ID Only)
- Cummins: 3930318 (throttle position / accelerator position sensor)
- Mopar dealer reference: 4874412 (ID only, verify before ordering)
- Common descriptions: TPS sensor, accelerator position sensor, APPS, throttle angle sensor.
Cross-reference information is provided for identification only. Always match by part number, connector, and mounting.
Related Genuine Cummins Components (CPP Diesel Internal Links)
Refresh all of your key 12-valve engine sensors and hardware with additional genuine Cummins parts from CPP Diesel:
- CUMMINS 3920363 OEM COOLANT TEMPERATURE SENSOR – 5.9L 12V (1992–1997)
- CUMMINS 3920364 OEM COOLANT TEMPERATURE SENSOR – RAM 5.9L 12-VALVE (1998)
- CUMMINS 3923129 OEM CRANKSHAFT POSITION / ENGINE SPEED SENSOR – 5.9L 12-VALVE (1997–1998)
- CUMMINS 3918461 OEM INTAKE AIR TEMPERATURE (IAT) SENSOR – 5.9L 12-VALVE (1991.5–1997)
- CUMMINS 3903834 OEM STARTER MOUNTING BOLT (12-POINT CAP SCREW) – RAM 5.9L (1994–2007)
Installation Notes
- Disconnect the negative battery cable before working on the TPS or harness.
- Carefully unplug the existing TPS connector; inspect for corrosion or damaged terminals.
- Remove the old sensor from the throttle shaft or bracket and note the orientation.
- Install the new Cummins 3930318 TPS, ensuring proper engagement on the shaft.
- Torque mounting hardware to OE spec; do not overtighten plastic housings.
- Follow factory procedures to verify idle and full-throttle voltage where applicable.
Specifications for cummins 3930318
| Specification | Detail |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Part Number | 3930318 |
| Sensor Type | Throttle Position / Accelerator Position Sensor (TPS/APPS) |
| Engine Compatibility (Key) | 1994–1998 Dodge/Ram 2500 & 3500 with 5.9L 12-valve Cummins (automatic transmission) |
| Engine Compatibility (Extended) | Used primarily on non-certified 5.9L B-series and related Cummins B, ISB, ISF, and QSB engine families (verify by ESN for non-Ram applications). |
| Connector Style | OE-style multi-pin TPS connector (rectangular plug – match to original) |
| GTIN | Not published by Cummins in available data |
| UPC | Not published by Cummins in available data |
| Shipping Weight | Approx. 1.0 lb (boxed) |
| Shipping Dimensions (L × W × H) | Approx. 4 in × 4 in × 3 in |
| Shipping Method | Ships via standard ground/small parcel from CPP Diesel |
| Cross Reference (ID Only) | Cummins 3930318; Mopar 4874412 (verify application and connector before ordering) |
| E-Codes / Emissions | Not individually emissions-certified; OE-calibrated engine management component |
| Prop 65 Warning | Yes – This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. |
FAQ
WILL THIS CUMMINS 3930318 TPS FIT MY 1994–1998 5.9L 12-VALVE RAM?Yes. Cummins 3930318 is the correct OE throttle position / accelerator position sensor for most 1994–1998 Dodge/Ram 2500 and 3500 trucks equipped with the 5.9L 12-valve Cummins and automatic transmission. Always confirm by VIN/ESN, existing part number, and connector style before ordering.
WHAT SYMPTOMS POINT TO A BAD TPS ON A 12-VALVE CUMMINS?
Common signs include random downshifts (4th to 3rd) at steady throttle, torque converter lock/unlock cycling, lack of lockup, erratic part-throttle shifts, or surging throttle response. A scan tool may also show an unstable or incorrect throttle position signal as you move the pedal.
DO I NEED TO ADJUST OR CALIBRATE THIS TPS AFTER INSTALLATION?
Follow the OE service manual procedure for your specific truck. On many 12-valve applications, the TPS must be installed and, if applicable, adjusted so that idle and full-throttle voltage fall within the specified range. Always check TPS voltage with a quality meter or scan tool after installation.
IS THIS A GENUINE CUMMINS SENSOR OR AFTERMARKET?
This listing is for a genuine Cummins 3930318 throttle position sensor sourced through CPP Diesel. It carries Cummins part markings and OE calibration. We do not substitute generic aftermarket sensors in place of this OEM unit.
WHAT OTHER CUMMINS PARTS SHOULD I REPLACE WHILE SERVICING THE TPS?
When diagnosing shift-quality issues on a high-mileage 12-valve, many owners refresh related sensors and hardware at the same time. Popular combos include a new 3920363 coolant temperature sensor , 3923129 crankshaft position sensor , and 3918461 intake air temperature sensor , along with checking grounds and harness routing.
