Aftermarket 3015238 Engine Coolant Temperature Sensor for Cummins K19 N14 6B5.9 6C8.3

3015238 Engine Coolant & Oil Temperature Sensor for Cummins K19 N14 M11 NT855 QSK19

Name: 3015238 Engine Coolant & Oil Temperature Sensor for Cummins K19 N14 M11 NT855 QSK19
Brand: Topvelsun
SKU: 3015238
Availability: InStock

Brand: Topvelsun

Weight: 0.085 kg

Warranty: 6 Months

Sensor Type: Coolant / Oil Temperature Sensor

Operating Voltage: DC 12V / 24V

Application: Cummins Engines K19, N14, NT855, M11

Product Description

Premium 3015238 Engine Coolant / Oil Temperature Sensor for Cummins

Ensure your heavy-duty Cummins engine operates within safe thermal limits with the 3015238 Temperature Sensor. Acting as a critical monitor for the engine ECU, this highly accurate sensor converts coolant or engine oil temperatures into precise electrical signals. It is essential for optimizing fuel injection timing, preventing overheating, and resolving rough idle conditions on classic mechanical and early electronic Cummins platforms.

Extensive Engine Compatibility

This sensor features standard 1/8 NPT threads for a direct OEM fit across a massive range of Cummins engine series:

B & C Series: 4B3.9, 6B5.9, 6C8.3
N Series: NH/NT 855, N14 MECHANICAL
M & L Series: M11 MECHANICAL, M11 CELECT PLUS, L10 MECHANICAL
Heavy-Duty K & V Series: K19, K38, K50, QSK19 CM500, V28

Technical Specifications & Build Quality

Measuring Range: Accurately tracks fluid temperatures from -40℃ to +150℃ with a rapid response time of ≤10ms.
Durability: Built with a 304/316 stainless steel probe and a high-strength engineered plastic/nickel-plated brass housing.
Sealing: Features imported Viton fluoroelastomer seals to resist degradation from hot mineral oils, diesel, and coolant.
Protection: IP67 rated against dust and moisture, surviving severe 10-2000Hz (20g) engine vibrations. Includes built-in surge and short-circuit protection.

Diagnostic Guide: Common Cummins J1939 Fault Codes

A failing 3015238 sensor will prompt the ECU to trigger check engine lights and alter performance. This sensor directly resolves the following codes:

Fault Code	Diagnostic Meaning & Symptoms
P0117	Coolant Temp Circuit Low Voltage: Indicates an internal sensor short or a wiring harness grounded out. Causes gauge to peg high.
P0118	Coolant Temp Circuit High Voltage: Indicates an internal open circuit, disconnected plug, or broken wire. Causes gauge to read completely cold.
P0197	Oil Temp Circuit Low Voltage: (When used in oil gallery) Sensor short. May cause the ECU to alter timing to protect the engine.
P0198	Oil Temp Circuit High Voltage: (When used in oil gallery) Open circuit in the oil temp monitoring loop.

Official Troubleshooting Guide

1. Hard Starts, Black Smoke & Rough Idle

Diagnosis: If the sensor's thermistor drifts, it may send an inaccurately "cold" reading to the ECU, causing it to over-fuel the engine during start-up. Use a diagnostic scanner to compare the sensor's live data reading against the actual ambient engine temperature when cold. If they differ by more than ±3℃, replace the sensor.

2. Erratic Gauge Readings & Sudden Jumps

Diagnosis: Often caused by severe scale/carbon buildup on the stainless steel probe, insulating it from the fluid. Remove the sensor and inspect the tip. If cleaning does not resolve the erratic signal, internal degradation has occurred.

3. Complete Loss of Signal (Codes P0118/P0198)

Diagnosis: Before replacing the sensor, test the wiring harness. With the key ON (engine off), you should see a 5V reference voltage at the connector. If voltage is present but the ECU reads a fault, the sensor's internal coil is broken.

Installation Tip: Do not over-tighten. Use Cummins-approved thread sealant (avoiding the sensor tip) and torque to 15±3 N·m to prevent housing distortion.