Diesel Trouble Codes

P008A — Low Pressure Fuel System Pressure Too Low (6.7 Power Stroke)

Diagnostic reference for 6.7 Powerstroke P008A.

Updated September 1, 2026

What it means

Low-side (supply) fuel pressure is below expected on the 6.7 Powerstroke.1

Most likely causes

  1. Frame-mounted low-pressure fuel pump module performance / failure — On this platform P008A typically points at the frame-mounted fuel pump module.1
  2. Clogged or restricted fuel filters — Clogged filters are a typical cause of low supply pressure on this platform.1
  3. Supply-line restriction — A supply-line restriction can cause low-side pressure to be below expected.1

How to diagnose

  1. Verify freeze-frame conditions and confirm P008A is present with low-side pressure data.
  2. Inspect fuel supply components for restrictions per platform guidance: frame-mounted pump module, filters, supply lines.
  3. Check for accompanying fuel-system codes that may indicate related high-pressure or supply issues.
  4. Assess fuel supply integrity without performing safety-critical high-pressure fuel line service.

Parts and tools you may need

Rough cost and difficulty

Parts and labor vary by vehicle and market. Obtain a local estimate.

When to see a pro

If low-side pressure remains below expected after supply-side inspection, have a qualified diesel technician evaluate the frame-mounted pump module and fuel supply circuit.

Sources

  1. Curated DTC seed — 6.7 Powerstroke (curated) ↩︎ ↩︎ ↩︎ ↩︎