What are the common causes of P045F?

EGR valve B stuck shut from carbon buildup. A clogged EGR B passage blocking flow. A failed EGR B actuator that will not move. A broken or shorted wire in the EGR B control circuit. A vacuum leak at the EGR B diaphragm or hose.

Command EGR valve B open with a scan tool and watch for movement. Inspect and clean the EGR B passage for carbon. Check the EGR B control circuit for opens and shorts. Test the EGR B vacuum supply and diaphragm. Replace EGR valve B if it stays shut. Clear the code and retest.

P045F

EGR B Control Stuck Closed

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P045F means EGR B Control Stuck Closed.

Check these first

EGR valve B stuck shut from carbon buildup
A clogged EGR B passage blocking flow
A failed EGR B actuator that will not move
A broken or shorted wire in the EGR B control circuit
A vacuum leak at the EGR B diaphragm or hose

What to do next

Command EGR valve B open with a scan tool and watch for movement
Inspect and clean the EGR B passage for carbon
Check the EGR B control circuit for opens and shorts
Test the EGR B vacuum supply and diaphragm
Replace EGR valve B if it stays shut
Clear the code and retest

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

Generic SAE J2012 definition. Last updated 2026-10-10.