Genuine GM 12686809 Fuel Rail Pressure Sensor 2017–2025 L5P Duramax 6.6L Diesel

If you’re experiencing hard starts, sluggish throttle response, reduced power, or fault codes on your L5P Duramax, the culprit is often a failing or misreading fuel rail pressure sensor. The GM 12686809 sensor is a direct OEM replacement designed to restore accurate fuel pressure readings to the ECM and resolve drivability issues.

Common Symptoms of a Faulty Sensor:
- Hard starts or long crank times
- Poor fuel economy
- Check engine light with fuel pressure DTCs
- Limp mode or reduced power
- Inconsistent throttle or idle issues

This sensor reads high-pressure fuel levels in the rail and sends that data to the ECM, which controls injector timing and flow. Faulty readings can trigger safety limits and poor performance.

Pro Tip: Wiring issues are also common in this circuit. If replacing the sensor doesn’t resolve the issue, inspect or replace the pigtail harness.

Features:
- Genuine OEM-quality fit and function
- Direct bolt-on replacement
- No tuning or modification required

Direct Fit for:
2017–2024 Chevrolet Silverado 2500HD / 3500HD (6.6L L5P Duramax)
2017–2024 GMC Sierra 2500HD / 3500HD (6.6L L5P Duramax)

SHIPPING IS FREE via USPS Ground Advantage to the lower 48 US states.

Alaska, Hawaii, Puerto Rico, Guam, APO/FPO addresses will need to email for a shipping quote.

CANADA, MEXICO, & ALL INTERNATIONAL BUYERS WILL NEED TO USE THE eBay GSP (GLOBAL SHIPPING PROGRAM)

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