2012 Isuzu NPR HD ( Gas 6.0 liter )

Matthew Service Manager Omaha, Nebraska Posted   Latest  
Question
Drivetrain
Programming
2012 Isuzu NPR 6.0L (N LQ9 345hp)—54DC4W1B2CS801487
U0101 - Lost Communication with TCM
P0575 - Cruise Control Input Circuit
U0073 - Control Module Communication Bus "A" Off
U0140 - Lost Communication With Body Control Module

I'm having trouble finding any resources to help form a diag plan for this vehicle. Any help would be appreciated. We have the Autel maxisys elite 906s with Jbox but it is struggling to connect or recognize the vehicle. I also have a durabook and I scan II but they will not connect to this van. I used my generic hand scanner to get the current codes. This is not our normal vehicle we work on but I'd love to figure this out. We ran fuses and checked the battery then got busy both checked fine. Also if this a vehicle that we should bail out on I'd love to know that. In my experience the consumer line up with Isuzu was terrible. 

Thank you so much 

0
Richard Mechanic
Chicago, Illinois
Richard Default
 

Check battery voltage at TCM. We work on these a lot and find bad connections at the battery terminals causing a low voltage condition to tcm. Usually under 12 volts. Isuzu’s tcm needs 12 volts to communicate. Also check grounds under drivers side headlight on frame. Three wires come out a loom and bolt to frame . Grounds get corroded and dash controlls loose connection. Also check battery to…

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Richard Mechanic
Chicago, Illinois
Richard Default
 

Also this is a GM based vehicle which uses GM Tech 2 to diagnose as well as Isuzu IDSS.

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Edwin Mobile Technician
Charleston, South Carolina
Edwin Default
 

Get a Nexiq usblink and the idss and you will have access to both the scantool and the information system...best bet for Isuzu's

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Richard Mechanic
Chicago, Illinois
Richard Default
 

iDSS works as a scan tool for Isuzu NPR 6.0 gas but doesn’t work for programming GM gas engine based NPR . You have to use GM TDS for programming. Engine management is GM based

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Edwin Mobile Technician
Charleston, South Carolina
Edwin Default
 

Thats correct

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Jamey Owner/Technician
Ventura, California
Jamey Default
 

Your Durabook should have GDS on the GM partition, Have you tried using it on this vehicle? It is a GM platform.

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default
   

A lot of times you can build these vehicles as a … Silverado 6.0 on a normal scanner. Anyway beyond all that what is the customer complaint? I guess I am asking because uou are having trouble getting a scanner to connect but yet you posted DTC's. I am a little confused. Not questioning your abilities, just confused;)

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John Owner/Technician
Marion, Iowa
John Default
 

Did you try to build the vehicle manually? If I use manual selection for Isuzu with my ms906ts it lists a 6.0L as a option.

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Matthew Service Manager
Omaha, Nebraska
Matthew Update
 

Thank you guys going to dig into it this AM.

0 Update Ð Bounty Awarded
Russell Technician
Omaha, Nebraska
Russell Default
 

Hey this is Russ. Thank you for the help with this unit. I am here in Omaha helping Matt with this NPR. Where exactly is the TCM located? Also where can we find a wiring diagram as well? Thank you so much for the help with this. Russ

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Jamey Owner/Technician
Ventura, California
Jamey Default
 

Hi Russell, have you contacted Joe at your home office about this truck? He or one of your support staff may have what you want. if not, contact Identifix via email and they most likely will send you whatever diagram you need.

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Matthew Service Manager
Omaha, Nebraska
Matthew Default
 

Thanks Jamey, I just reached out to them.

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Richard Mechanic
Chicago, Illinois
Richard Default
 

Isuzu’s TCM is located below glovebox under fuse panel.

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Matthew Service Manager
Omaha, Nebraska
Matthew Default
 

Richard, its been slow moving on the NPR. There is two modules under the glove box. Difficult to determine which one is what. ****THE KICKER*** someone stole the cats off of it last night. Hacked sawed them off. We had to take it down to our exhaust guy hope to get it back this Thursday.

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Richard Mechanic
Chicago, Illinois
Richard Default
 

Check fuses #20 which is 10amp ecm And 22 which is 10amp battery hot at all times. If truck gas GM trans in it module is in trans . If it has Asin trans in it the module under glove box will be marked. Still sounds like canbus issue or low voltage issue.

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Matthew Service Manager
Omaha, Nebraska
Matthew Update
 

Broken wiring on black/ blue line. Primary power feed to TCM. Thank you guys for all the help.

0 Update Ð Bounty Awarded