GM 6-Pin Engine / Radiator Waterproof Wire Harness Connector – OEM 15344031 Direct Fit
Direct OEM-specification replacement for the GM 6-pin waterproof wire harness connector used on engine bay and radiator harness applications across Chevrolet, GMC, and Buick platforms. Cross-references GM part number 15344031. Uses the 1.5mm contact series in black nylon housing with IP67 waterproof sealing. Designed for the high-temperature, high-vibration environment of the engine bay and radiator area.
Engine bay connectors on GM vehicles are exposed to extreme heat cycling, coolant spray, and vibration. The 6-pin 1.5mm series connector used on radiator fan motors, coolant temperature sensors, and engine management harnesses is a known failure point on high-mileage vehicles. Connector corrosion or locking tab failure causes intermittent or permanent loss of the cooling fan signal, triggering overheating conditions and P0480–P0483 (cooling fan relay circuit) fault codes. Replacing the connector is the correct repair when the fan motor and relay test within specification.
| OEM Number | Application |
|---|---|
| 15344031 | GM primary 6-pin engine/radiator harness connector |
| Pin Group | Typical Function | Failure Symptom if Open |
|---|---|---|
| Pins 1–2 | Cooling fan motor power and ground | Fan not running, overheating |
| Pins 3–4 | Fan speed control signal (PWM) | Fan runs at fixed speed or not at all |
| Pins 5–6 | Coolant temp sensor or auxiliary circuit | P0115–P0118 coolant temp sensor fault |
| Attribute | Detail |
|---|---|
| Pin Count | 6-Pin |
| Contact Series | 1.5mm pitch |
| Housing Material | Nylon, black |
| Sealing | IP67 waterproof |
| OEM Part Number | 15344031 |
| Applications | Radiator cooling fan harness, engine sensor harness |
| Compatible Brands | Chevrolet, GMC, Buick (GM platform) |
| Terminal Included | Yes |
Q: My Chevrolet is overheating and the cooling fan isn’t running — could it be the connector?
A: Yes. A corroded or open 6-pin radiator connector is a common cause of cooling fan failure on GM vehicles. The ECM logs P0480 (cooling fan 1 relay circuit) or P0481 (cooling fan 2 relay circuit) when the fan control signal is absent. Test the fan motor and relay first — if they are within specification, inspect the 6-pin harness connector before replacing the ECM or fan assembly.
Q: What fault codes does a failed radiator connector cause?
A: Common DTCs include P0480–P0483 (cooling fan relay circuit faults), P0115–P0118 (coolant temperature sensor circuit), and P0217 (engine overtemperature condition). The specific code depends on which pin circuit has failed.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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6 Pin Connectors
