Diesel Trouble Codes

P046C — Exhaust Gas Recirculation Position Sensor Circuit Range/Performance (6.7 Power Stroke)

Diagnostic reference for P046C Exhaust Gas Recirculation Position Sensor Circuit Range/Performance on 6.7 Powerstroke.

Updated September 1, 2026

What it means

EGR position feedback is implausible versus command. Typical on this platform: EGR valve position sensor or the valve assembly.1

Most likely causes

  1. EGR valve position sensor or valve assembly fault — Typical on this platform: EGR valve position sensor or the valve assembly.1
  2. EGR valve stuck open due to soot binding — Typical on this platform: Soot binding the valve; sometimes the cooler.2
  3. EGR flow excessive / sensor rationality fault — Typical on this platform: Stuck-open EGR valve or a sensor rationality fault.3

How to diagnose

  1. Confirm code P046C is present and check for related EGR codes.
  2. Inspect EGR valve position sensor signal vs commanded position using scan tool data.
  3. Check EGR valve mechanical operation and soot binding; inspect cooler for restriction.
  4. Verify wiring and connectors to EGR position sensor for damage or corrosion.
  5. Compare EGR position feedback plausibility with command; replace valve assembly if feedback remains implausible.

Parts and tools you may need

Rough cost and difficulty

Parts and labor vary by region and shop rate.

When to see a pro

If diagnosis is inconclusive or valve replacement is required, have a qualified diesel technician perform testing and repair.

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.

How to: Ford 6.7 Powerstoke EGR Unplug Locations — Troy Lyons

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