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roy, import/domestic specialest
Category: Dodge
Satisfied Customers: 6175
Experience:  ASE master tech for 40 years
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Check engine light for code 0401 have checked vacuum lines

Customer Question

check engine light for code 0401 have checked vacuum lines are good checked control valve has 40 ohms
JA: Does the light stay on, or does it blink?
Customer: stays on
JA: What is the make/model/year of your car?
Customer: 2000 dodge caravan
JA: Are you fixing your Caravan yourself? What have you tried so far?
Customer: yes checked vacuum lines and connections ohms on control valve hooked up vac meter has 15-23 pounds vac also has 40 ohms
JA: Anything else you want the mechanic to know before I connect you?
Customer: Yes I started engine with vacuum gage in line and disconneted the power to the control for the egr made no difference and no additional codes
Submitted: 11 months ago.
Category: Dodge
Expert:  roy replied 11 months ago.

good evening my name is ***** ***** I will assist

what engine???


Customer: replied 11 months ago.
Expert:  roy replied 11 months ago.

ok thanks.

the first thing I would do is to remove the valve and run the engine and check for exhaust at the valve and the other port should be vacuum. you need to verify this first.



  • Exhaust leak
  • Intake manifold restricted
  • EGR back pressure transducer defective
  • EGR valve assembly defective
  • EGR valve assembly mounted incorrectly
  • EGR system failure does not reoccur
  • EGR transducer line blocked
  • EGR valve assembly diaphragm defective
  • Vacuum supply to EGR solenoid inadequate
Expert:  roy replied 11 months ago.

please dont forget to rate me as it is the only way I get paid for my efforts