Fuel Delivery Error - P0148
P0148 indicates a fuel delivery system malfunction, typically caused by low fuel pressure or volume. The powertrain control module (PCM) detects that the actual fuel pressure does not match the desired pressure, often due to a failing fuel pump, clogged fuel filter, or faulty fuel pressure regulator. This code can lead to drivability issues and potential engine damage if ignored.
1. Most Common Causes
- Faulty fuel pump
- Clogged fuel filter
- Faulty fuel pressure regulator
- Fuel line restriction or leak
- Wiring or connector issues in fuel pump circuit
2. Symptoms You Will Notice
- Engine cranks but won't start
- Loss of power under acceleration
- Engine stalling
- Rough idle
- Check Engine Light illuminated
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0148 and check for additional codes.
Step 2: Check fuel pressure with a gauge; compare to manufacturer specs.
Step 3: Inspect fuel pump relay and fuse.
Step 4: Test fuel pump voltage and ground at the pump connector.
Step 5: Check for fuel leaks or restrictions in lines and filter.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may stall or lose power unexpectedly, increasing the risk of an accident.
How much does it cost to fix?▼
Repair costs range from $150 to $500, depending on the cause. A fuel pump replacement is typically $300-$500.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.