Diesel Trouble Codes

P244A — Diesel Particulate Filter Differential Pressure Too Low (Bank 1) (6.4 Power Stroke)

Diesel Particulate Filter Differential Pressure Too Low (Bank 1)

Updated September 2, 2026

What it means

The PCM sees a lower-than-expected pressure difference across the DPF on Bank 1. On the 6.4L Power Stroke this points to an aftertreatment/DPF sensing issue or a failed/cracked DPF substrate, not enough restriction being seen. It is a DPF code, not an EGR cooler bypass valve circuit code.1

Most likely causes

  1. DPF differential-pressure sensor hoses disconnected, cracked, or leaking — Leaking or disconnected sensing hoses cause the measured delta-P to read low.1
  2. DPF differential-pressure sensor fault or wiring issue — A failed sensor or wiring can report an artificially low delta-P.1
  3. Cracked or failed DPF substrate / internal DPF leak — A broken substrate reduces restriction, so delta-P stays low.1
  4. Exhaust leak upstream of the DPF — A leak before the DPF can reduce measured pressure differential.1

How to diagnose

  1. Verify freeze-frame conditions and confirm P244A is present with no accompanying DPF efficiency or restriction codes.
  2. Inspect DPF differential-pressure sensor hoses for disconnection, cracks, or oil contamination; check routing and secure connections.
  3. Inspect the DPF differential-pressure sensor electrical connector and wiring for damage, corrosion, or moisture.
  4. Command a DPF pressure test with a scan tool and compare live delta-P to expected values at idle and elevated RPM.
  5. Inspect the DPF and exhaust for external leaks upstream of the DPF that could affect pressure readings.
  6. If sensor and hoses test good, evaluate DPF integrity for internal cracking or substrate failure using approved pressure testing and visual inspection methods.
  7. Review recent regen history and related DPF codes such as P2002, P244B, P2463, P2459 to assess overall aftertreatment health.
  8. Clear codes, road test under conditions that set the monitor, and confirm the fault does not return.

Parts and tools you may need

Rough cost and difficulty

Diagnostic labor varies; DPF sensor/hose replacement is typically lower cost than DPF replacement. Actual repair cost depends on findings.

When to see a pro

If DPF substrate failure is suspected, or if exhaust disassembly is required, have a qualified diesel aftertreatment technician perform inspection and repair. Do not attempt high-pressure fuel or exhaust system repairs without proper training and safety equipment.

Sources

  1. Curated DTC seed — 6.4 Power Stroke (curated) ↩︎ ↩︎ ↩︎ ↩︎ ↩︎