264-4297 Cat Sensor GP-Temp (Low-Temperature Sensor) is primarily used for monitoring engine coolant temperature, but can also be utilized for monitoring low oil or fuel temperatures; it serves as a critical component in engine thermal management and ECM protection. I. Core Parameters and Specifications

OEM Part Number: 264-4297 (2644297, CA2644297)

Official Name: Coolant Temperature Sensor / Sensor GP-Temp (Low-Temperature Type)

Type: NTC (Negative Temperature Coefficient) Thermistor (Passive Resistive Type)

Primary Application:

Monitors engine coolant temperature (Main Function)

Used on select models for low-temperature monitoring of engine oil / fuel

Electrical: 2-pin DT waterproof connector; Passive resistive output (resistance decreases as temperature increases); Requires no external power supply

Mechanical: Thread: 3/4-16 UNF (#8); Brass housing; IP67 Protection Rating; Operating Temperature: -40°C to 125°C

Measurement Range: -40°C to 125°C (High-precision range for low temperatures)

Replacement Models: 256-6453, 130-9809, 102-2240 (Interchangeable in certain applications)

II. Compatible Engines and Equipment (Mainstream Models)

Engines (Coolant / Oil Temperature)

C7, C9, C13, C15, C18, 3126B, 3126E, 3406C, 3512B

Excavators

324D, 325B/C/D, 330D, 336D, 390D

Loaders / Motor Graders / Articulated Trucks

Loaders: 950M, 966H, 972M, 980M, 299D2

Motor Graders: 120H, 140H, 140M, 160H

Articulated Trucks: 725, 730, 735, 740

III. Fault Symptoms and Diagnostics

Typical Symptoms

Abnormal coolant temperature gauge readings (High / Low / No Display)

Difficulty starting the engine (Cold / Hot), unstable idle speed, reduced power output

Engine cooling fan runs continuously, high-temperature warning triggered, ECM-related faults Entering Thermal Protection Mode

Increased fuel consumption, excessive black smoke, abnormal coolant consumption

Common Fault Codes (CAT)

P0115/P0116/P0117/P0118: Coolant Temperature Sensor Circuit / Performance Fault

P0182/P0183: Engine Oil Temperature Sensor Circuit Fault (Common across applicable models)

Quick Diagnostics

Measure resistance values with the engine cold vs. hot (Cold: ≈2000–5000Ω; Hot: ≈100–300Ω)

Check the connector for looseness, corrosion, or water intrusion; verify the sealing integrity of the sensor installation

Use a diagnostic tool to read real-time temperature values and compare them against the actual coolant temperature

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