P0087 on Mercedes-Benz: How to Diagnose & Fix
Fuel Rail/System Pressure - Too Low
5 Mercedes-Benz models · 6 documented issues · 5 critical · $900-$8,000 repair
P0087 on Mercedes-Benz by model: symptoms, diagnosis and fix
A number of late-model E-Class owners reported hard starting, long crank times, hesitation, and occasional stalling traced to low-pressure fuel supply faults, including in-tank fuel pump or delivery module issues. Mercedes-Benz recalled 2021-2023 E-Class vehicles (NHTSA 23V-445, expanded by 23V-880) because the in-tank fuel pump impeller may not meet material specifications, can deform and rub the pump housing, and can shut the fuel pump down, causing loss of drive power; a warning message and rough running may appear first. Symptoms can be sporadic at first and become a complete no-start as the pump weakens.
Common Symptoms
- Extended cranking
- Intermittent no-start
- Engine stalling
- Hesitation on acceleration
- Reduced power
- Whining noise from fuel tank area
How to Fix
First check the VIN for open recalls 23V-445 / 23V-880; under the recall a Mercedes-Benz dealer replaces the fuel delivery module free of charge. Measure low-side fuel pressure during crank and under load, compare commanded versus actual values, and inspect pump current draw and fuel pump control operation. Repair usually involves replacing the in-tank fuel pump/delivery module and sealing ring, then clearing adaptations and verifying pressure stability on a road test. If contaminated fuel is suspected, inspect the tank and filter components as well.
Owner tips & cautions
- TipOwners recommend not ignoring occasional long-crank events; capturing fuel pressure data early can prevent getting stranded later.
Sources for this issue (2)
The in-tank fuel pump fitted to a broad range of 2021-2024 Mercedes-Benz models, including the 2021-2023 AMG GT, uses an impeller that did not meet material specification. The impeller swells or deforms in service, contacts the pump housing and binds. The mechanical resistance shuts the pump down, and the vehicle loses propulsion without warning — the car will not restart afterward. Mercedes-Benz's Part 573 report notes that before a full stall the engine may run rough and warning lamps may illuminate, which is the only advance notice an owner gets. NHTSA campaign 23V880000 covers 79,676 vehicles across GLE, GLS, C-, E-, S-, SL-, GLC-, CLS-Class, G-Class and AMG GT. Because MBUSA mailed owner letters in phases between February and December 2024, some owners were notified months after others.
Common Symptoms
- Engine stalls without warning and will not restart
- Rough running before shutdown
- Fuel system warning lamp illuminates
- Loss of propulsion while driving
How to Fix
Free recall remedy: the dealer replaces the fuel pump under 23V880000. Owner letters were mailed in phases between February 23 and December 2, 2024, so the absence of a letter does not mean a car is unaffected. Verify the VIN at nhtsa.gov/recalls and confirm the pump was actually replaced rather than merely inspected. Treat a rough-running condition or a sudden fuel-system warning on an affected car as urgent rather than as a routine drivability complaint — the documented failure mode ends in an unrestartable stall.
Sources for this issue (3)
NHTSA campaign 21V961000 covers 2019 AMG GT 53 and AMG GT 63 four-door models and calls for replacement of the fuel rail together with the fuel injectors. A defective high-pressure rail or injector interface on a direct-injection engine leaks fuel into the engine bay under pressure, adjacent to hot turbocharger and exhaust components. This is separate from the later 23V880000 in-tank pump recall — different component, different failure, different model years — and it is confined to a narrow 2019 build population on the X290 four-door. It affects both the M256 inline-six GT 53 and the M177 V8 GT 63, so it is not a single-engine issue, but it is a single-model-year issue and should not be extrapolated to 2020 and later cars.
Common Symptoms
- Fuel odor in or around the engine bay
- Visible fuel seepage at the fuel rail or injector seats
- Hard starting or rough idle
- Check engine light
How to Fix
Free recall remedy: the dealer replaces the fuel rail and fuel injectors under 21V961000. Because this is a fuel-leak defect near hot components, an affected 2019 GT 53/GT 63 showing a fuel smell should not be driven until inspected. Verify completion by VIN — this campaign is old enough that used cars change hands with it still open, and a used-car listing's clean history report is not a substitute for the NHTSA lookup.
Sources for this issue (1)
The OM656 diesel uses a precise Bosch CP4 common-rail high-pressure fuel pump that reacts poorly to low-quality diesel or fuel contamination. Even minor tank impurities or a single mis-fueling event can damage the pump and injection nozzles, and metallic debris from a failing CP4 can circulate through the fuel system. Clogged fuel filters from contaminated fuel further disrupt combustion and cause power loss. Repairs can be extensive because a failed CP4 may require cleaning or replacing injectors, lines and the high-pressure pump.
Common Symptoms
- Hard starting or no-start
- Rough running / misfire
- Power loss
- Fuel system warning light
- Metal debris in fuel filter
How to Fix
Fuel only with high-quality diesel from reputable stations and never mis-fuel with petrol. Replace the fuel filter(s) on schedule. At the first sign of a hard start, rough running, or fuel-system warning, stop driving and have the fuel system inspected — catching CP4 wear early can avoid a full fuel-system contamination repair. If metallic debris is found, the pump, lines and injectors typically all require service.
Sources for this issue (2)
NHTSA recall 23V445 covers model-year 2021-2022 G 550 vehicles and model-year 2021-2023 AMG G 63 vehicles, plus a limited 2022 AMG G 63 4x4 Squared population. Certain fuel-pump impellers may not meet material requirements, deform, contact the pump housing and create enough mechanical resistance to stop the pump. The vehicle can lose propulsion; a warning message and rough running may precede shutdown.
Common Symptoms
- Fuel-system warning message
- Rough running
- Loss of drive power while driving
How to Fix
Check the VIN for NHTSA recall 23V445 / Mercedes campaign 2023070012. An authorized Mercedes-Benz dealer will replace the fuel delivery module free of charge when the recall is open. Treat rough running, a fuel-system warning or loss of propulsion as a safety concern. Eligibility and the applicable A4634705900 fuel delivery module remedy are VIN-specific.
Sources for this issue (1)
Recall 23V445 directly covers 43,257 model-year 2021-2023 GLC 300 vehicles with fuel-pump impellers that may not meet material specifications. An affected impeller may deform, contact the pump housing and create mechanical resistance; in some instances the fuel pump can shut down and the vehicle can lose propulsion, increasing crash risk. A warning message or rough running may occur before shutdown.
Common Symptoms
- Warning message on the dash
- Rough running
- Loss of drive power while driving
How to Fix
Check the VIN for recall 23V445 and have an authorized Mercedes-Benz dealer replace the fuel-delivery module when eligible. Recall eligibility depends on the VIN.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
P0087 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0087 mean on a Mercedes-Benz?
P0087 stands for "Fuel Rail/System Pressure - Too Low." This code means the fuel rail or fuel system pressure has dropped below the level the engine's computer expects. The computer monitors a fuel pressure sensor and has seen pressure fall too low, meaning the engine isn't getting enough fuel — especially noticeable under acceleration or load. This is most common on direct-injection and diesel systems that run very high pressures. Symptoms include hard starting, stalling, hesitation, lack of power, and possible limp mode. On Mercedes-Benz it is documented across 5 models: E-Class, AMG GT, GLS, G-Class, GLC.
What are the most common causes of P0087?
The most common causes of P0087 are: Clogged or dirty fuel filter, Weak or failing fuel pump (lift pump or high-pressure pump), Faulty fuel pressure regulator or control valve, Restricted or leaking fuel lines, Faulty fuel pressure sensor, Air in the fuel system or running low on fuel, Worn high-pressure pump (direct injection/diesel). The specific cause varies by vehicle.
How much does it cost to fix P0087 on a Mercedes-Benz?
Published repair estimates on Mercedes-Benz range from $900 to $8,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.