DEF Pump Circuit Low (Generic)
The P4067 code means the vehicle's onboard diagnostic system has detected: DEF Pump Circuit Low (Generic). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $900 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Low DEF pressure
- Insufficient DEF delivery
- SCR efficiency reduced
- DEF system warning
Probable Causes (Ranked by Likelihood)
- Short to ground in DEF pump circuit Very High
- DEF pump underperforming High
- Blocked DEF line Moderate
- Frozen DEF in lines Low
Step-by-Step Diagnostic Procedure
-
Test DEF pump motor circuit for shorts
-
Check DEF line for blockage or air
-
Verify DEF system pressure
-
Inspect for frozen DEF in cold weather
Frequently Asked Questions
Can frozen DEF cause P4067?
Yes, if DEF freezes in the lines or pump, it cannot flow properly.
Can I drive with P4067?
You can drive short distances. A derate countdown may start.
How do I thaw frozen DEF?
The vehicle DEF heater should thaw it automatically. Park in a warm garage if not working.
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