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Have 2015 Volvo VNL780 D13 Code showing P 205B and P040B.

Customer Question
Have 2015 Volvo...

Have 2015 Volvo VNL780 D13 Code showing P 205B and P040B

Mechanic's Assistant: What's the make and model of your?

VNL 780 , 2015

Mechanic's Assistant: Have you seen this error before with the same vehicle?

First time

Mechanic's Assistant: The Volvo Mechanic will know what to do about that error code. Is there anything else the Volvo Mechanic should know before I connect you? Rest assured that they'll be able to help you.

Had a new radiator put on just before code showed up

Submitted: 4 months ago.Category: Medium and Heavy Trucks
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Answered in 3 minutes by:
6/1/2022
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 4 months ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,619
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
Verified
Hello and thank you for using Just Answer. My name is ***** ***** I’d like to try and help. I am sorry that you are having issues with your truck. I know this can be frustrating. I am here to help anyway I can. Please allow me a few moments to look over your question and I will be right back with you. May I please ask with whom I have the pleasure of speaking with today
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Customer reply replied 4 months ago
William W.
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 4 months ago

Nice to meet you William. These codes are for the reductant tank temp and for the egr temp sensor. The egr temp sensor is more than likely just a bad sensor. This is a commonly replaced item on these. The reductant tank temp is for the def tank temp. This can be caused by a bad def level sensor, software updated needed, or an issue with the def tank shut off valve. I would check the reading of the temp with a scan tool to see if the sensor is reading biased.

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Customer reply replied 4 months ago
EGR sensor has been changed
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 4 months ago

Was it changed to remedy this fault on this occurance?

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Customer reply replied 4 months ago
Not for the code P205B ,just to address the EGR reading . Had EGR LOOK AT ITS GOOD BUT STILL GETTING CODE
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 4 months ago

Was a learned data reset performed after the sensor was replaced? When this is not done it will adjust off of what the learned value was before the sensor was replaced.

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Customer reply replied 4 months ago
No
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 4 months ago
I would do that first as the ecm needs to be told to reset it’s learned values.
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Customer reply replied 4 months ago
Gotcha
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Mike Mcmillan
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,619
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Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel

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