P0148
PowertrainFuel Systemhigh severityFuel Delivery Error
What P0148 Means
The PCM detects that actual fuel delivery does not match the commanded amount. This is common on diesel and high-pressure fuel systems where delivery is monitored closely.
Symptoms
- Hard starting
- Poor engine performance
- Illuminated check engine light
Common Causes
- Faulty fuel pump
- Clogged fuel filter
- Fuel pressure regulator fault
- Wiring or connector problems
Diagnostic Steps
- Scan for stored codes and freeze frame
- Check fuel pressure with a gauge
- Inspect fuel filter and lines for restriction
- Test fuel pump and regulator operation
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Community Confirmed Fixes
No confirmed fixes yet for this code. Be the first to contribute!
Submit a FixFound a Fix for P0148?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix