P0087 on Pontiac: How to Diagnose & Fix
Fuel Rail/System Pressure - Too Low
1 Pontiac model · 1 documented issue · 1 critical · $30-$800 repair
P0087 on Pontiac by model: symptoms, diagnosis and fix
The 2008-2009 G8 was the subject of multiple recalls including NHTSA 09V-172 (GM 09046/09101), in which the brake pedal position switch may have been incorrectly programmed so the brake lamps stay lit and fail to warn following drivers when braking; the same campaign corrected the tire-pressure-monitor warning thresholds. Australian-built G8s also had several fuel-tank module / fuel-pump related TSBs. The brake-lamp programming fault is present from the factory, while the fuel-pump problems are common at 60,000-120,000 miles.
Common Symptoms
- brake lights stay on
- cruise control inoperative
- extended cranking
- fuel pump whine
How to Fix
Brake lamps stuck on: have a dealer check recall 09V-172 on your VIN first. The fix reprograms the brake pedal position sensor for free. If the recall is already done and the lamps still stay on, the sensor/switch may need replacing ($30-$50 part), followed by a scan-tool calibration of the sensor. Fuel pump assembly is more involved — $400-$700 OEM part, install via the tank-top access plate (no need to drop the tank). Confirm any open recalls on your VIN — Pontiac/GM recalls remain open for free dealer repair indefinitely.
Sources for this issue (2)
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 Pontiac?
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 Pontiac it is documented across 1 model: G8.
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 Pontiac?
Published repair estimates on Pontiac range from $30 to $800 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.