Aston Martin diagnostic trouble code
P0148: Fuel Delivery Error. System too lean
Use this reference to understand the recorded condition, confirm the available V8 Vantage or DB9 manual coverage, and follow the documented diagnostic checks before replacing parts.
- Code family
- Powertrain
- Vehicle system
- Fuel and air
- Manual coverage
- V8 Vantage, DB9
- Warning-lamp status
- V8 Vantage: Not stated; DB9: MIL
What Aston Martin code P0148 means
Fuel Delivery Error. System too lean
DB9 preliminary diagnostic manual · section 2-42
Manufacturer fault-analysis procedure
Manual fault definition
P0148 - Fuel Delivery Error
Cautions and notes
CAUTION: This codes may be generated in the
Primary or Secondary Powertrain Control Module
(PCM). Check that you are working on the correct
half of the engine.
Primary or Secondary Powertrain Control Module
(PCM). Check that you are working on the correct
half of the engine.
Test sequence and decision path
1. Connect the WDS and confirm that P0148 is
logged. Note which engine bank is affected. Also
note all other logged DTCs and list any fuel
related codes.
2. Using WDS, monitor the fuel rail pressure in both
rails during a KOER test.
If both fuel rail pressures are equal and approximately 40 psi above manifold pressure, the fuel
delivery system is serviceable. go to step 3.
If the fuel rail pressure for the affected bank is out
of specification, service the fuel system as necessary. Clear the P0148 code and run a KOER test
to ensure that the problem is resolved.
Clear all DTCs. Conduct a road test including
town and country driving over a variety of road
surfaces. Using WDS, monitor the fuel pressure.
Note the fuel pressure and driving conditions
when the ‘Check Engine” light comes on. Check
for other fuel pump DTCs logged at the same time.
Using this information, service the fuel system as
necessary and run a further road test to ensure that
the problem is resolved.
Open the corresponding manual page for wiring diagrams and figures
logged. Note which engine bank is affected. Also
note all other logged DTCs and list any fuel
related codes.
2. Using WDS, monitor the fuel rail pressure in both
rails during a KOER test.
If both fuel rail pressures are equal and approximately 40 psi above manifold pressure, the fuel
delivery system is serviceable. go to step 3.
If the fuel rail pressure for the affected bank is out
of specification, service the fuel system as necessary. Clear the P0148 code and run a KOER test
to ensure that the problem is resolved.
Clear all DTCs. Conduct a road test including
town and country driving over a variety of road
surfaces. Using WDS, monitor the fuel pressure.
Note the fuel pressure and driving conditions
when the ‘Check Engine” light comes on. Check
for other fuel pump DTCs logged at the same time.
Using this information, service the fuel system as
necessary and run a further road test to ensure that
the problem is resolved.