GM / Buick 2-Pin Front Bumper Radar / Knock Sensor / Temperature Sensor Connector – OEM 31402-2110 / 31403-2110
Direct OEM-specification replacement for the GM 2-pin wire harness connector used on front bumper radar probes, knock sensors, and temperature sensors across Buick and GM platforms. Cross-references GM OEM part numbers 31402-2110 and 31403-2110. Uses the 0.7mm contact series in grey, black, or brown nylon housing — available in multiple colours to match the original harness. Compatible with Buick GL8, LaCrosse, Regal, Weilang, GL6, and Ang Kola collision sensor harnesses.
The 2-pin sensor connector on GM and Buick vehicles is used across multiple underbonnet and bumper-mounted sensor applications. Knock sensor connectors are located on the engine block in a high-heat, high-vibration zone; radar probe connectors are mounted in the front bumper, exposed to road spray and stone chips. Both are common failure points on high-mileage vehicles. A failed knock sensor connector causes the ECM to log P0325–P0334 (knock sensor circuit) fault codes and retard ignition timing as a safety measure, reducing power and fuel economy. A failed radar probe connector disables the front collision warning system.
| OEM Number | Application |
|---|---|
| 31402-2110 | GM 2-pin sensor connector (primary) |
| 31403-2110 | GM 2-pin sensor connector (alternate / superseded) |
| Pin | Function | Failure Symptom if Open |
|---|---|---|
| 1 | Sensor signal output | P0325–P0334 knock fault, timing retard, or radar fault |
| 2 | Ground / shield | Sensor inoperative, DTC logged |
| Attribute | Detail |
|---|---|
| Pin Count | 2-Pin |
| Contact Series | 0.7mm pitch |
| Housing Material | Nylon |
| Housing Colours | Grey / Black / Brown (select variant) |
| OEM Part Numbers | 31402-2110 / 31403-2110 |
| Applications | Front bumper radar probe, knock sensor, temperature sensor, collision sensor |
| Compatible Models | Buick GL8, LaCrosse, Regal, Weilang, GL6, Ang Kola; Chevrolet / GM shared platform |
| Terminal Included | Yes |
Q: My Buick LaCrosse has a P0325 knock sensor fault — could it be the connector?
A: Yes. A corroded or open 2-pin knock sensor connector is a common cause of P0325–P0334 fault codes on GM and Buick vehicles. The ECM retards ignition timing when it loses the knock signal, reducing power and fuel economy. Test the knock sensor resistance first — if it is within specification (typically 4–10kΩ), the fault is in the connector or wiring.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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2 Pin Connectors
