Cummins 3920363 — Genuine Coolant Temperature Sensor (5.9L B-Series)

MPN: 3920363  |  Also Known As: engine coolant temp sensor, ECT, gauge sender  |  Connector Style: single-wire

Restore accurate temperature readings on your first/second-gen 5.9. The genuine Cummins 3920363 coolant temperature sensor is the OE single-wire sender used on many 1992–1997 Ram 2500/3500 5.9L 12-valve applications and other B-Series engines. Built to Cummins’ calibration and sealing specs for reliable data and long service life.

Features & Benefits

• OE signal accuracy so the PCM/instrument cluster reads true coolant temperature.
• Direct-fit single-wire sender for common 5.9L 12V builds—no wiring hacks.
• Durable sensing element and body for heat, vibration, and coolant exposure.
• Fixes common symptoms like inoperative/erratic temp gauge or nuisance overheat warnings (after wiring/ground checks).
• Genuine Cummins part number for traceability.

Verified Fitment (Automotive)

Industrial/Off-Highway: Cummins catalogs 3920363 as a Temperature Sensor used primarily on 5.9L B-Series engines (Euro 2 family). Verify by ESN for equipment engines.

Specifications

• Type: Coolant temperature sensor (single-wire sender)
• OE Part Number: 3920363
• Electrical: 1-pin sender to gauge/PCM (verify harness on your vehicle)
• Mounting: Threads into coolant passage (seal included on many kits)
• Quantity Required: 1 per engine

Often Paired With

• Connector pigtail/repair lead (if your single-wire terminal is brittle or corroded)
• Thermostat (OE): Cummins 5292744 190° or 5292742 180° (’98.5–’07 windows; for earlier trucks use correct-year units)
• Coolant & sealing washer/O-ring as applicable to your build

What’s In The Box

• (1) Genuine Cummins Coolant Temperature Sensor (3920363)
• Seal/washer may be included by supplier—check contents.

Installation Tips

• Work on a cool engine; lower coolant level below the sensor.
• Clean the port; install the new sensor and tighten to spec. Do not overtighten.
• Inspect the single-wire connector and ground path; repair if green/corroded.
• Refill/bleed coolant and verify gauge and scan-tool readings.

FAQ

WILL THIS FIT MY 5.9L 12-VALVE RAM?

It’s the OE single-wire sender for many 1992–1997 trucks. Some sellers include 1998; if you have a 1998, check your VIN/ESN and connector style to confirm.

IS THIS THE GAUGE SENDER OR THE ECM SENSOR?

It’s a single-wire coolant temperature sender used for gauge/PCM input on many 12-valve applications. Always match to your connector style.

DOES IT COME WITH A SEAL?

Many OE packages include the needed seal/washer. If not, reuse only if in perfect condition or replace with new.

WHERE IS IT LOCATED?

Threaded into an engine coolant passage—commonly the cylinder head/thermostat housing area, depending on build.

IS THIS A GENUINE CUMMINS PART?

Yes—OE Cummins 3920363.