Diesel Trouble Codes

P042E — Exhaust Gas Recirculation Control Stuck Open (6.7 Power Stroke)

Diagnostic reference for 6.7 Powerstroke P042E.

Updated September 1, 2026

What it means

The EGR control circuit reports the valve stuck in the open position.1

Most likely causes

  1. Soot binding the EGR valve — Carbon/soot accumulation can hold the valve open on this platform.1
  2. Soot binding in the EGR cooler — Cooler restriction can contribute to EGR flow issues on this platform.1
  3. Stuck-open EGR valve — A mechanically stuck valve can cause excessive EGR flow.2
  4. EGR position sensor or valve assembly fault — Implausible position feedback versus command can mimic a stuck condition.3

How to diagnose

  1. Verify code and freeze frame; confirm P042E is current and note engine conditions.
  2. Inspect EGR valve operation with a scan tool; compare commanded vs actual position and look for rationality faults.
  3. Check for related EGR codes such as P0402 Excessive Flow, P046C Position Sensor Range/Performance, P0401 Insufficient Flow.
  4. Review live data for EGR position, EGR differential pressure, and engine load at idle and cruise.
  5. Perform a visual inspection for external soot leaks, damaged EGR piping, and signs of carbon buildup at the valve and cooler.
  6. If equipped, check EGR cooler for restriction or leakage that could affect valve operation.
  7. Clear codes and test drive to confirm repeatability of P042E under normal operating conditions.

Parts and tools you may need

Rough cost and difficulty

Costs vary by region and labor rates; obtain local quotes.

When to see a pro

Refer to a qualified diesel technician for internal EGR service, calibration, or any safety-critical work. Do not attempt step-by-step repair of high-temperature exhaust components.

Sources

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

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

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

Watch a repair

Third-party videos, not ours — for illustration. Confirm anything against the factory service information for your truck.

WATCH How EASY This Ford 6.7L Diesel EGR Repair Is! — ProMaxx Tool

Avoided Disaster Ford 6.7 Power Stroke Egr Valve Replacement — Drews Shop Life