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P0401 code. Egr replaced, map replaced, throttle cleaned,

Customer Question
P0401 code. Egr...

P0401 code. Egr replaced, map replaced, throttle cleaned, computer and wire checked

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

P0401 yes it has been reset multiple times

Mechanic's Assistant: What is the make/model/year of your car?

05 impala 3.4

Mechanic's Assistant: Are you fixing your Impala yourself? What have you tried so far?

Yes. Egr replaced, throttle cleaner through both ports, map replaced, wires and comp checked

Submitted: 8 months ago.Category: Chevy
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Answered in 5 minutes by:
11/10/2017
Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Chevy
Satisfied Customers: 5,640
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicles A6 - Electrical / Electronic systems A7 Heating / Air Conditioning systems
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Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

Hey how are you

did you take off the EGR tube connected to the exhaust manifold completely off and cleaned it ,i use shop air to blow thru it outside the car , the tube has to 100% clean

click on link to view the pdf file of the egr tube the location ,and also step by step troubleshoot for DTC P0401 to troubleshoot correctly

You are very welcome :)

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Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

Let me know if you need anything else on it , just reply back here & we can continue.

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Customer reply replied 8 months ago
Tube was clear of any carbon deposits. Now it stalls soon as it starts. Thinking iac.
Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

iac, take it out and clean the plate and retest

if idle is not calibrated

try this ,turn switch from off to on ,wait 30 secs

then back to off , then wait 30 secs ,then start and see if it idles

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

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Customer reply replied 8 months ago
Replaced the iac, stalling issue fixed. Still have p0401 code. Cleaned the port behind the throttle plate with a dental pick and throttle cleaner but nada. Still have the code. Twice now p0141 pops up. Once 3 weeks ago and once today but clears out and only shows in the history.
Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

ok that is an improvement on iac

man not sure it keeps popping seems u covered anything ,but that leaves ecm causing this fault but not actually anything wrong that is the only thing i can think off at this time

is the manifold were egr tube is connected craked any leaks

read this below on p0401

. MAP sensor faults must be diagnosed first. A skewed MAP sensor reading could cause this DTC to set.

change that map and check the vacuum line to it

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

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Customer reply replied 8 months ago
Map was already replaced, day before i contacted you actually. Vac line to it replaced. No ecu issues, it was checked by the dealer. Im completely lost on this. Maf was also replaced and the tps sensor as well. No cracks in any vac line that i can find, no compressed lines, no failed gaskets or cracks i can find. Runs fine overall, start up is a little rough sometimes but thats the only symptom
Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

man, wow have to say not sure what else to do here ,the fact runs good ,it is a false dtc

i seen that but rare ,usually would be ecm my experience on this but i see ur point

i can opt out of the question for other experts for another opinion for you

just let me know

chad

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Customer reply replied 8 months ago
Probably, if you dont mind. I think we are both stumped at this point :(I feel like im chasing a ghost at this point
Chevy Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

i agree

good luck with it

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