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Complaint: Vehicle will not travel over 40 MPH. Check Engine…

Customer Question
Complaint: Vehicle will not travel over...
Complaint:
Vehicle will not travel over 40 MPH. Check Engine Light OnCause:
Inactive Codes
P0161,P0443,0053,0054,0059,0060CAUSE:
1) Found Mass Air Flow Sensor Bad. Replaced mass Air flow Sensor
2) Air filter replaced
3) Replace UPPER & LOWER O.T. Sensors on Exhaust System
4) Replaced Purge Valve Control
5) Replaced Evac. System Purge Control Valve
6) Replaced Purge Tank Valve, Check Valve Canister
8 Noticed when running and hooked up to computer...Mass Air Flow rate at 0.2
Still have INACTIVE CODES
P0443,P0030,P0036,P0050,P0056 & P0102When we get the inactive codes to clear, unit acts as though it is flooding out and eventually dies.
Inactive Codes return to computer as inactive. unit will run over 40 MPH now, just cannot get codes to clear.2009 WORKHORSE W42
V8 6.0Liter GMC Engine
V.I.N. 93435950
279,313 MilesWhere do we go from here?
Submitted: 8 months ago.Category: Chevy
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Answered in 18 minutes by:
11/9/2017
Chevy Mechanic: Gabriel Grey, Auto Service Technician replied 8 months ago
Gabriel Grey
Gabriel Grey, Auto Service Technician
Category: Chevy
Satisfied Customers: 448
Experience: Master Service Technician
Verified

Hello, I hope you are doing great today. My name is***** am a GM technician and would be happy to assist you with this.

It sounds to me like we have a ground/module issue. These circuits all should share a common ground, and that is why the codes are coming on all at once. Give me just a moment to locate the diagrams and I will let you know what to check

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Customer reply replied 8 months ago
Thank you!
Chevy Mechanic: Gabriel Grey, Auto Service Technician replied 8 months ago

Okay, there are two common spots that could be tripping these codes. The first is going to be the PWRTRN relay, this feeds power to the MAF/O2 fuses, if this relay is shorting out it will cause all sorts of issues. So first let's check power at the fuses I have highlighted in the diagrams. If the relay is providing power then the next step will be testing the ECM ground signals.

Just a heads up, some relays will test good even when they have an intermittent short, so it may be best to toss a new one in there just to be sure. Let me know the results after checking these fuses

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Customer reply replied 8 months ago
Unfortunately, we do not have a FUSE BOX Cover to tell us WHICH relay is WHICH.
Do you have a COVER diagram that tells us which relay is what in the fuse box?
Chevy Mechanic: Gabriel Grey, Auto Service Technician replied 8 months ago

Yes let me try and locate that for you , one moment please

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Customer reply replied 8 months ago
Thanks
Chevy Mechanic: Gabriel Grey, Auto Service Technician replied 8 months ago

Okay check this out and let me know if it looks similar. This is the box breakdown for both the 6.0 and the 6.6 engine. Since you're tied into the workhorse chassis it may be missing a few of these fuses due to lack of features on the vehicle, but the engine/emission circuits stay the same. Let me know if you have any questions once you get in there :)

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Customer reply replied 8 months ago
Gabriel,Here is a photo of our fuse box in our vehicle. Tried comparing your diagram on the gas to ours.
Somewhat confused as to which fuse we need to address in our box. can you tell me by looking
at this picture which is the engine/emission circuits?
Chevy Mechanic: Gabriel Grey, Auto Service Technician replied 8 months ago

Alright, it appears we will have a slight issue here. That fusebox looks like it has been equipped as an aftermarket add on, and has eliminated/upgraded the factory fuse box when it was built. Let me see if I can find any more info, I may need to open this up to a new expert

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Customer reply replied 8 months ago
OK....thanks!
Chevy Mechanic: Lou P., ASE Certified Technician replied 8 months ago
Lou P.
Lou P., ASE Certified Technician
Category: Chevy
Satisfied Customers: 6,102
Experience: Building and driving Chevy's since I was in the womb!!!! Camaro and Corvette enthusiast, access to factory diagrams and tsb's
Verified

Hello are you still needing assistance?

did you get this figured out yet?

Lou

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Customer reply replied 8 months ago
Thanks Lou for getting n touch.
Yes we had to figure it out on our own.
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