Fuel Rail/System Pressure - Too Low
The DURAMAX-P0087 (Duramax) diesel fault code means: Fuel Rail/System Pressure - Too Low. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- advanced
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What Are the Symptoms of DURAMAX-P0087?
- Check Engine Light on
- Hard starting, long cranking or no start
- Loss of power or reduced power mode
- Possible stalling
What Causes DURAMAX-P0087? (Most Likely First)
- Restricted fuel filter or low supply from the tank side High
- Air entering the fuel supply Moderate
- High-pressure pump wear or failure Moderate
- Fuel pressure regulator or metering valve fault Moderate
- Faulty rail pressure sensor reading Low
Can I Still Drive with DURAMAX-P0087?
No — stop driving. DURAMAX-P0087 is rated critical severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Common Fixes by Vehicle
What techs usually find when diagnosing DURAMAX-P0087 on specific platforms — tap a platform for the fix and the exact part:
2011-2016 GMC Sierra/Chevy Silverado 2500/3500 6.6L LML Duramax Advanced DIY
P0087 (fuel rail pressure too low) on the LML is the dreaded CP4 pump failure. When the CP4 lets go, it grenades metal debris throughout the entire fuel system -- rail, injectors, lines, tank. Full repair at a dealer is $7,000-$12,000. Many owners pre-emptively install an S&S Diesel Motorsport CP3 conversion kit ($3,000-$4,500) before failure. If P0087 has already set, drop the tank immediately to check for metal -- don't drive the truck.
Labor: 8-12 hours (full fuel system)2006-2010 GMC/Chevy 2500/3500 6.6L LBZ/LMM Duramax Moderate DIY
On the LBZ and LMM the fuel system uses a Bosch CP3 which is far more reliable. P0087 here usually means a clogged fuel filter, weak lift pump, or a stuck fuel pressure regulator on the CP3. Replace the filter first ($30), then test lift pump pressure (should be 5-8 PSI). If both are good, replace the FPR on the pump -- $150 part and 1 hour of labor.
Labor: 30 min - 2 hoursFrequently Asked Questions
What does P0087 mean on a Duramax?
P0087 means Fuel Rail/System Pressure - Too Low. Measured fuel rail pressure is below what the engine computer is commanding.
Is P0087 a Duramax-specific code?
No. P0087 is a generic OBD-II code defined by SAE J2012, so it means the same thing on any vehicle that sets it. The exact conditions GM uses to set it on its diesels are in GM service information.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose DURAMAX-P0087?
Compare desired and actual rail pressure on a scan tool while cranking and running.
Check supply-side fuel pressure and the fuel filter before condemning the high-pressure pump.
Inspect the fuel filter and its housing for metal debris. Debris means the high-pressure pump needs attention before the truck is driven further.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P0087 as a generic OBD-II code)
P0087 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
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