P008A: How to Diagnose & Fix — Low Pressure Fuel System Pressure - Too Low
3 vehicles · 3 makes · $50-$15,000 repair
How to diagnose and fix P008A: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Ford F-150 · 2018–2020
The 2018-2020 F-150 3.0L Power Stroke diesel uses a Bosch CP4.2 high-pressure fuel pump. The CP4 was engineered for high-lubricity European diesel, not U.S. ultra-low-sulfur diesel, so its internal roller/cam followers can run dry and gall. Air ingress and cavitation accelerate the wear. When the pump fails it doesn't just stop — it 'grenades,' sending metal shavings throughout the entire high-pressure fuel system, destroying injectors, rails, lines, and the tank in a cascade. Owners have reported failures as early as ~48,000 miles, and the resulting whole-system replacement commonly runs $8,000-$15,000+. It is the single most catastrophic and most-searched issue for the F-150 diesel.
Common Symptoms
- Sudden loss of power / engine stall and no-restart
- Hard starting or extended cranking
- Metal debris found in fuel filter
- Fuel-system / powertrain warning lights
- Rough running before total failure
How to Fix
Prevention is key: run a quality diesel fuel/lubricity additive at every fill, change the fuel filters on schedule, prime carefully and avoid running the tank to empty (air ingress), and consider a CP4 'disaster prevention'/bypass kit that routes pump weep fuel and filters debris before it reaches the tank/lines (e.g. S&S Diesel CP4-6.7F-BP-G2.1-class kits, model-fitment dependent). After a failure, the entire high-pressure side must be replaced — CP4 pump (Bosch, Ford FC3Z-9A543-A-class on 6.7; verify exact 3.0L PN), all injectors, rails, lines, and tank flush. Some owners convert to a more tolerant pump. Prevention kit/additive $50-$500; post-failure repair $8,000-$15,000+.
Sources for this issue (1)
Genesis GV70 · 2022–2023
The low-pressure fuel pump assembly can contain an impeller made from material that does not meet specification. Under high ambient temperatures the impeller deforms and interferes with the pump housing, creating mechanical resistance that shuts the pump down and starves the engine of fuel. The result is a sudden loss of motive power or an engine stall while driving, which can happen at speed and create a crash risk. Genesis addressed it under safety recalls 016G and 022G (NHTSA 23V-630 and 24V-282), covering 2022-2023 GV70 along with G80/GV80/G90.
Common Symptoms
- Sudden engine stall while driving
- Loss of motive power
- Hard starting or no-start, especially in hot weather
- Engine hesitation or stumbling
- Check engine light
How to Fix
Check the VIN against NHTSA recalls 23V-630 / 24V-282 (Genesis 016G/022G). The free remedy is replacement of the low-pressure fuel pump assembly using the recall service kit and tool per Genesis TSB 23-01-083G. Owners noticing stalling, hesitation, or hard starts in hot weather should have the recall completed before further driving.
Sources for this issue (1)
Mercedes-Benz GLC · 2021–2023
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)
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P008A 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 P008A mean?
P008A stands for "Low Pressure Fuel System Pressure - Too Low." Generic OBD-II code, most often seen on direct-injection and diesel vehicles that use both a low-pressure lift pump and a high-pressure pump. The PCM compares the commanded low-side fuel pressure to what the low-pressure fuel sensor reports and sets this code when actual pressure (or fuel volume/flow) falls below the expected value. Because the high-pressure pump is starved, the engine can run lean, misfire, hesitate under load, crank a long time, stall, or go into reduced-power mode. This one should not be ignored - sustained low supply pressure can damage the high-pressure pump. Note that some manufacturers define this code slightly differently.
What are the most common causes of P008A?
The most common causes of P008A are: Weak or failing in-tank fuel pump / lift pump, Clogged fuel filter or restricted fuel line, Faulty low-pressure fuel or fuel rail pressure sensor giving a false low reading, Leaking fuel line, injector, or pressure regulator on the low-pressure side, Low fuel level or contaminated/wrong fuel, Fuel pump control module or wiring/relay fault. The specific cause varies by vehicle.
How much does it cost to fix P008A?
Repair costs for P008A range from $50 to $15,000, depending on the vehicle and root cause.
Which vehicles are affected by P008A?
Au7o has documented P008A across 3 vehicle models from 3 manufacturers: Ford, Genesis, Mercedes-Benz.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.