P0087 on Cadillac: How to Diagnose & Fix
Fuel Rail/System Pressure - Too Low
3 Cadillac models · 3 documented issues · 3 critical · $600-$1,500 repair
P0087 on Cadillac by model: symptoms, diagnosis and fix
GM recalled 2021 Cadillac XT5 and XT6 and GMC Acadia vehicles on which the fuel supply line may not have been fully seated and locked at the quick-connect fitting during assembly. An unseated line can loosen or separate under fuel system pressure and vibration, spraying gasoline in the engine bay or under the vehicle, creating a fire hazard and a potential stall from loss of fuel pressure.
Common Symptoms
- Strong raw gasoline smell around the vehicle
- Visible fuel wetness or drips near the fuel line routing
- Hard starting or stalling from low fuel pressure
- Fuel odor entering the cabin
How to Fix
Verify the VIN against NHTSA campaign 21V422000; dealers inspect the fuel supply lines and replace them as necessary at no charge. Owner notification letters went out July 1, 2021. If you smell raw fuel, do not drive the vehicle - have it inspected, because an unseated quick-connect can go from a seep to a full separation without warning.
Sources for this issue (1)
If you own a 2021 Cadillac XT6, this one is worth a VIN check. GM recalled a limited group of 2021 XT6, XT5 and GMC Acadia vehicles because the fuel supply lines may have been improperly attached and seated at the factory. Lines that are not properly seated may loosen or separate, causing a fuel leak, which increases the risk of a fire. The whole campaign covers 572 vehicles across all of the models listed, so inclusion is the exception rather than the rule for the XT6 — but the potential outcome is serious enough that verifying by VIN is the right move rather than waiting to notice a problem. GM's internal recall number is N212335590, and owner letters were mailed July 1, 2021.
Common Symptoms
- Fuel odor
- Gasoline leaking or pooling under the vehicle
How to Fix
Free of charge at a Cadillac dealer: the technician inspects the fuel supply lines and replaces them as necessary so they are correctly attached and seated. Enter your XT6's VIN at nhtsa.gov/recalls to see whether this campaign applies to your specific vehicle, since the affected population is small. If it does apply and you notice a fuel odor or any sign of leaking fuel in the meantime, stop driving the vehicle and have it towed in. Cadillac customer service: 1-800-458-8006, GM recall number N212335590.
Sources for this issue (1)
The fuel pump power control module (FPCM), mounted under the vehicle near the fuel tank on 9-speed 2.0T LSY XT4s, fails internally and stops commanding the in-tank pump. The failure is typically abrupt with no preceding driveability symptoms: the engine cuts out at speed or refuses to restart after a normal shutdown, and the vehicle cranks but will not fire. Owners report repeat failures on the same vehicle. GM opened a fuel pump control module recall (campaign N252516900) covering a subset of build ranges, but NHTSA complaints show owners with out-of-scope VINs experiencing identical failures, and the pattern spans 2021 through 2025 build years.
Common Symptoms
- Engine suddenly shuts off while driving
- Cranks but will not start
- Complete loss of motive power with no warning lights
- Vehicle stalls at idle or at a stoplight and must be towed
- Repeat failure after previous fuel pump repair
How to Fix
Diagnose with a scan tool for stored fuel pump control module and related low fuel-rail-pressure codes; confirm no pump command / no pump power with the module commanded on. The repair is replacement of the fuel pump power control module (and in some cases the in-tank pump module assembly), followed by programming. Check the vehicle's VIN against GM recall N252516900 first, as covered vehicles get the module replaced at no charge. Because failure is sudden and total, do not defer the repair once the code has been stored.
Sources for this issue (4)
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 Cadillac?
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 Cadillac it is documented across 3 models: XT5, XT6, XT4.
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 Cadillac?
Published repair estimates on Cadillac range from $600 to $1,500 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.