Applicable Systems
EMCP 4.2

Symptoms

Engine derate active due to DEF system fault; torque reduction and speed limitation in effect.

Possible Causes

  • DEF tank empty or low
  • DEF quality below specification
  • SCR system fault preventing NOx reduction

Troubleshooting Steps

  1. Step 1: Check DEF tank level and quality
    DEF level > 10% and quality 32.5%
  2. Step 2: Review all SCR/DEF related active codes
    No other SCR codes active
  3. Step 3: Resolve underlying SCR fault (see SPN 3719/3364)
    All SCR codes cleared
  4. Step 4: Perform inducement reset via Cat ET
    Derate lifted after reset
  5. Step 5: Verify full engine power restored on road test
    Full power, no derate active

How to Reset

Inducement reset requires Cat ET and all SCR faults resolved first.

Common Replacement Parts

  • DEF Fluid (2.5 gal) P/N: 222-7640

Frequently Asked Questions

  • Q: How to clear DEF inducement derate?

    Must resolve all SCR/DEF faults first, then reset inducement via Cat ET. Simply adding DEF will not clear if other faults exist.

Related Caterpillar Fault Codes

Source: verizonconnect.com DTC guide

Category: Heavy Equipment