I. Core Parameters and Specifications

Part Number: 288-8390 (2888390, CA2888390)

Official Name: Sensor GP-Temperature / Coolant Temperature Sensor / Oil Temperature Sensor

Type: NTC Thermistor-type Temperature Sensor

Primary Applications:

Monitors engine coolant temperature (Primary use)

Monitors engine oil temperature (Select engine models)

Used for hydraulic oil temperature monitoring (Select equipment models)

Electrical: 2-pin waterproof connector; 5V power supply; Negative Temperature Coefficient (NTC) — resistance decreases as temperature increases

Mechanical: Thread M14×1.5 / 1/2-14 NPT; Brass housing; IP67 protection rating; Operating temperature range: -40°C to 150°C

Measurement Range: -40°C to +150°C

Accuracy: ±1°C

Replacement Models: 522-1642, 522-1643, 131-0427 (General Caterpillar compatibility)

II. Compatible Engines and Equipment (Mainstream Models)

Engines

C15, C18, C27, C32, C175, C175-20, 3516B, 3406, 3306, 3512B

Heavy Equipment

Wheel Loaders: 988H, 988K, 990K, 992K, 993K, 994H

Dozers / Wheel Dozers: 824H, 834H, 834K, 844K, 854K

Articulated Trucks: 797F

Compactors: 825H, 826H, 836H

III. Failure Symptoms and Diagnostics

Typical Symptoms

Coolant/Oil temperature alarms, overheat protection activation, engine torque derating / shutdown

Difficulty cold-starting, unstable idle speed, increased fuel consumption

ECM reports temperature sensor circuit / range / performance faults Instrument Panel Temperature Display Anomaly (High / Low / No Display)

Common Fault Codes (CAT)

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

P0195/P0196/P0197/P0198: Engine Oil Temperature Sensor Circuit Fault

Quick Check

Verify the integrity of the 5V reference voltage and ground connection.

Measure resistance values with the engine cold and hot (approx. 2.2 kΩ at 25°C; approx. 180 Ω at 100°C — NTC characteristics).

Check for loose connections, corrosion, or water ingress at the connector; verify the sensor's mounting seal and torque.

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