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.
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
- EGR valve position sensor or valve assembly fault — Typical on this platform: EGR valve position sensor or the valve assembly.1
- EGR valve stuck open due to soot binding — Typical on this platform: Soot binding the valve; sometimes the cooler.2
- EGR flow excessive / sensor rationality fault — Typical on this platform: Stuck-open EGR valve or a sensor rationality fault.3
How to diagnose
- Confirm code P046C is present and check for related EGR codes.
- Inspect EGR valve position sensor signal vs commanded position using scan tool data.
- Check EGR valve mechanical operation and soot binding; inspect cooler for restriction.
- Verify wiring and connectors to EGR position sensor for damage or corrosion.
- Compare EGR position feedback plausibility with command; replace valve assembly if feedback remains implausible.
Parts and tools you may need
- Scan tool with live data
- Multimeter
- Inspection light
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
Watch a repair
Third-party videos, not ours — for illustration. Confirm anything against the factory service information for your truck.
Help improve this guide
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