The OBD2 code P008B, “Low Pressure Fuel System Pressure – Too High,” indicates that the fuel pressure in the vehicle’s low-pressure side is higher than what the engine control module (ECM) expects. This condition can lead to symptoms like low power, unusual throttle response, decreased fuel economy, and hard starts, affecting various vehicles including Ford, Dodge, and Chevrolet models with both diesel and gasoline engines.
P008B quick overview
| Meaning | P008B: Low Pressure Fuel System Pressure – Too High |
| Is it serious? | Yes, it can significantly impact engine performance and efficiency. |
| Possible causes | – Faulty fuel injector – Damaged fuel line – Malfunctioning fuel pump – Clogged or dirty fuel filter |
| How to diagnose? | Check for fuel leaks to ensure system integrity. Inspect the fuel filter and replace it if it’s dirty or clogged. Examine the fuel injector for leaks or damage. Assess the fuel pump’s condition for proper operation. |
P008B Meaning
When you encounter a P008B code, it’s telling you there’s too much pressure being built up in the part of the fuel system that’s supposed to deliver fuel at low pressure. This could make your vehicle hard to start, slow to respond, or even use more fuel than usual.
The problem might be due to a leaky injector, a broken fuel line, a pump that’s not working right, or a filter that needs cleaning or replacing. Mechanics will usually start by looking at these parts to see where the issue might be and fix it to get your vehicle running smoothly again.
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How to fix P008B – learn from mechanics
I looked into P008B service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Ford P008B
Vehicle information
2015 Ford F-250 Super Duty XLT 6.7L V8 Power Stroke
Issue + repair history
- Experienced symptoms of low power and abnormal throttle response
- Previous repairs include replacement of fuel filter and low-pressure fuel pump
- Code P008B: Low Pressure Fuel System Pressure – Too High detected by ECM
Other OBD2 Codes + Test Results
- Code P008B: Low Pressure Fuel System Pressure – Too High
- No live data test results mentioned in the forum post
Mechanic suggestions
- Check for any fuel leaks and promptly address them to prevent further pressure issues
- Inspect the condition of the low fuel pressure system’s filter and replace if necessary to ensure proper fuel flow
- Examine fuel injector for leaks or damage that could impede fuel flow and contribute to high pressure in the system
Final fix
- After thorough inspection, it was found that the fuel injector was faulty, causing irregular fuel flow and leading to high pressure within the low fuel pressure system. Replacing the faulty fuel injector resolved the issue, restoring proper fuel flow and pressure regulation in the system.
Case #2: Dodge P008B
Vehicle information
2016 Dodge Ram 1500 Laramie 5.7L V8 Hemi
Issue + repair history
- Reported symptoms include decreased fuel economy and sluggish engine performance
- Prior repairs involve replacing fuel line and filter
- Code P008B: Low Pressure Fuel System Pressure – Too High detected by ECM
Other OBD2 Codes + Test Results
- Code P008B: Low Pressure Fuel System Pressure – Too High
- No specific test results provided in the forum post
Mechanic suggestions
- Urgent check for any fuel leaks to maintain system integrity and prevent pressure abnormalities
- Verify the condition of the fuel filter and replace if necessary to ensure proper fuel flow
- Inspect fuel injector for leaks or damage that could contribute to high pressure within the low fuel pressure system
Final fix
- Upon inspection, it was discovered that the fuel line was damaged, causing irregular fuel flow and resulting in high pressure within the low fuel pressure system. Replacing the damaged fuel line resolved the issue, restoring proper fuel flow and pressure regulation in the system.
Case #3: Chevrolet P008B
Vehicle information
2014 Chevrolet Silverado 3500HD LTZ 6.6L V8 Duramax
Issue + repair history
- Noted symptoms include abnormal throttle response and hard starts
- Previous repair efforts focused on replacing fuel injector and fuel pump
- Code P008B: Low Pressure Fuel System Pressure – Too High detected by ECM
Other OBD2 Codes + Test Results
- Code P008B: Low Pressure Fuel System Pressure – Too High
- No specific test results mentioned in the forum post
Mechanic suggestions
- Promptly address any fuel leaks to maintain system integrity and prevent pressure irregularities
- Assess the condition of the fuel filter and replace if necessary to ensure proper fuel flow
- Inspect fuel injector for leaks or damage that could contribute to high pressure within the low fuel pressure system
Final fix
- Further investigation revealed that the fuel pump was malfunctioning, causing inadequate fuel delivery and resulting in high pressure within the low fuel pressure system. Replacing the faulty fuel pump resolved the issue, restoring proper fuel delivery and pressure regulation in the system.
How to diagnose P008B
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Brief Explanation |
|---|---|
| Inspect for fuel leaks | Identifies any leaks that could be causing pressure build-up. |
| Replace the fuel filter | Ensures clean fuel flow and correct pressure levels. |
| Check the fuel injector | Looks for leaks or damage that might affect fuel delivery. |
| Assess the fuel pump | Checks if the pump is delivering fuel correctly and at the right pressure. |
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✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
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✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)