P0148

Universal

Fuel Delivery Error

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The engine control system has detected a condition related to fuel delivery. Fuel delivery supplies the engine with the fuel it needs to run; a problem may affect starting or engine performance. The code does not identify a failed part, and the exact detection logic depends on the vehicle.

Report an error with this code

⚠️ Before You Begin (Safety First)

If you see or smell leaking fuel, switch off the engine, keep away from flames or sparks, and do not drive the vehicle. If the engine stalls, loses power severely, or is difficult to control, stop in a safe place and arrange assistance.

Common Symptoms

  • The warning light may come on, with or without noticeable drivability problems.
  • The engine may crank longer than usual or have difficulty starting if fuel delivery is inadequate.
  • Rough running, hesitation, or reduced power may occur if the engine is not receiving fuel as expected.
  • The engine may stall if the fuel-delivery problem becomes severe.
  • There may be no obvious symptoms if the detected condition is intermittent or does not noticeably affect engine operation.

Common Causes

  • A restriction or other problem in the fuel supply may interfere with delivery to the engine.
  • A fault in a fuel pump or its electrical supply or connections may affect fuel delivery.
  • A problem with fuel pressure regulation or another fuel-system component may cause delivery to differ from what the control system expects.
  • A wiring, connector, or ground fault in a relevant circuit may disrupt fuel-system operation or its monitoring.
  • An intermittent condition or vehicle-specific monitoring issue may require further testing before a cause can be identified.

Diagnostic Steps

  1. Check that the vehicle has fuel and note whether the engine has starting, running, or power symptoms; this helps describe the condition during diagnosis.
  2. With the engine off, look for visible fuel leaks or damage around accessible areas. Do not touch or loosen fuel lines; if you find a leak or smell fuel, do not start or drive the vehicle.
  3. If safe and accessible, visually check fuel-system wiring and connectors for obvious damage or disconnection. Do not probe circuits without vehicle-specific instructions.
  4. Record the code and any available scan-tool information before clearing codes. The information may help a technician identify whether the condition is current or intermittent.
  5. If symptoms are severe, the engine stalls, or a fuel leak is suspected, stop driving and arrange professional diagnosis.

When to Call a Professional

Use vehicle-specific service information to interpret the code and scan data. A technician can compare relevant fuel-delivery readings with the system's operating commands, check electrical supply and connections, and test fuel-system components as applicable. Avoid replacing a part based on the code alone.

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Commonly Asked Questions

Does P0148 prove that the fuel pump has failed?

No. The code indicates a fuel-delivery-related condition, not a confirmed failed part. The fuel supply, electrical connections, pressure regulation, and other vehicle-specific causes may need to be checked.

Can I drive with P0148?

It depends on how the vehicle is behaving. If it runs normally and there is no fuel leak, arrange diagnosis promptly and monitor for changes. Stop safely and seek assistance if it stalls, loses power severely, or smells of leaking fuel.

Why might the code appear without obvious symptoms?

The detected condition may be intermittent or may not noticeably affect engine operation. Scan data and vehicle-specific tests can help determine what the system detected.

What should a technician check?

The technician can use model-specific information to evaluate relevant fuel-delivery readings, electrical connections and supply, and fuel-system components. The appropriate checks depend on the vehicle's design and the symptoms.

Related Diagnostic Video

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