P0087 on Mercedes-Benz: How to Diagnose & Fix
Fuel Rail/System Pressure - Too Low
6 Mercedes-Benz models · 7 documented issues · 6 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 service literature for related models and owner reports point to intermittent fuel pressure loss rather than a high-pressure pump problem in some cases. 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
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.
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. This is an EU-relevant concern given diesel availability and variable fuel quality across markets.
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. The 143,551 figure is the total multi-model recall population, not a G-Class owner-report count.
Common Symptoms
- VIN recall eligibility checked
- fuel-system warning and rough running documented
- loss of propulsion handled as a safety concern
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. Do not buy a fuel pump from this page; eligibility and the applicable A4634705900 delivery-unit remedy are VIN-specific.
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Sources for this issue (1)
On M260 2.0T GLB250 vehicles built in the affected window, metal or plastic particles left over from the production process can become trapped between the fuel rail and the fuel injector sealing surface. Over time those particles score and damage the seal, letting pressurized gasoline weep out at the rail/injector joint into the engine compartment. Fuel that contacts hot exhaust or turbo components creates a fire risk. Owners typically notice a raw fuel smell after shutdown, a fuel odor in the cabin at idle, or fuel staining on top of the engine cover before any warning light appears. Mercedes-Benz filed NHTSA campaign 21V961000 (MBUSA 2022030003) in December 2021 covering a very broad list of gasoline models, with the 2020 GLB250 included alongside the closely related A220 and CLA250.
Common Symptoms
- Strong raw fuel smell from the engine bay or cabin
- Visible fuel wetness or staining around the fuel rail and injectors
- Fuel odor strongest at idle or shortly after shutdown
- Check engine light in some cases
- Rough running or hard start if the leak is significant
How to Fix
Have the VIN checked against NHTSA campaign 21V961000 at an authorized Mercedes-Benz dealer. The recall remedy is replacement of the complete fuel rail and all four fuel injectors, free of charge, regardless of mileage or warranty status. Do not attempt to reseal or reuse the original injectors - the sealing surfaces are damaged by the trapped particles. Any strong fuel odor from the engine bay should be treated as urgent: stop driving and have it towed rather than risk an underhood fire.
Sources for this issue (3)
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. The 43,257-vehicle population is not an owner-report count.
Common Symptoms
- VIN checked for recall 23V445
- warning message and rough running documented
- loss-of-propulsion risk treated as safety-critical
How to Fix
Check the VIN for recall 23V445 and have an authorized Mercedes-Benz dealer replace the fuel-delivery module when eligible. Do not buy a fuel pump or delivery module from this page; recall eligibility and the correct module are VIN-specific.
Sources for this issue (1)
The in-tank fuel pump fitted to a broad range of 2021-2024 Mercedes-Benz models including the 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 more than 87,000 vehicles across GLE, GLS, C-, E-, S-, SL-, GLC-, CLS-Class, G-Class and AMG GT. Because MBUSA issued an interim notice in February 2024 before the final remedy was ready, a number of owners were told their car was defective months before a fix existed, and some cars were stalled in the interim.
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. Interim owner letters went out February 13, 2024 with a second notice once the remedy parts were released, so a car whose only paperwork is the interim letter has NOT been repaired. 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)
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 6 models: E-Class, GLS, G-Class, GLB, GLC, AMG GT.
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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View P0087 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.