Jump to content

No Abs Module Communication 2003 Chev 3500

Danomite

By Danomite
in Ask A GM Technician

Recommended Posts

Danomite Enthusiast

Danomite

Posted
Posted

Vehicle: 2003 Chev 3500 Flatbed

Gas 6.0l 2WD

 

Hi and thanks in advance. I have used the search function on this forum.

 

I am a tech at a general repair shop. Here's the problem. This vehicle has both the abs light and the brake light on at all times. After disconnecting the battery both lights come on immediately after retstart. I have tried 2 Snap-On and a Tech 2 scanner and neither will communicate with the abs module. All other modules (pcm, airbag etc) do communicate. Fuses ok. Power and ground to abs motor good. Voltage drop from ground wire at abs motor to battery is 0.043 volts, vehicle running. Cleaned 2 large grounds under drivers door on frame. No difference.

 

I have now installed a new dealer abs module and still the same problem. Using a labscope i am not getting any signal from the light blue A9 wire which is the communication wire to the DLC. I have cut the wire to eliminate shorts, and still no digital signal.... am I missing something here or did I receive a defective module?

 

I have not checked the resistance of the pump motor, but it moves briefly when i connect it with the key on...

 

ANY help appreciated!!!

Danomite Enthusiast

Danomite

Posted
  • Author
Posted
you should sublet it to the dealer to have it programed and verified if it got fixed

 

Hi and thanks...I forgot to mention that, that was one of my initial suggestions when the truck first came in....I actually had it at the dealer today briefly to try their scanner and the tech there told me there was no listed reflash to specifically fix a communication problem...there is a tsb for reflashing this abs module, but not specifically for loss of comm...I dunno, maybe he was wrong...

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

the way it works is if I want to update a module with the lastest calibration or software ,I hook it up to the scanner/laptop/pc,go in and click on the proper software and if I click yes to "REprogram" ,it knows what software is already in the modue ,it will not program again what it has already has in the module,so it says ,sorry ,no dice,but to program a new module ,we click on "replace & reprogram"and it will take it every time,like a champion,lol,the tech would know this,p.s ,there is a list for updates to not choose but to accept,so I don't and can't help anymore here than to educate on the proceedure that is typical for programing,wow ,alot of ink I wasted eh?'anywho ,good luck ,ps I hope I didn't confuse you/anyone.

Danomite Enthusiast

Danomite

Posted
  • Author
Posted
the way it works is if I want to update a module with the lastest calibration or software ,I hook it up to the scanner/laptop/pc,go in and click on the proper software and if I click yes to "REprogram" ,it knows what software is already in the modue ,it will not program again what it has already has in the module,so it says ,sorry ,no dice,but to program a new module ,we click on "replace & reprogram"and it will take it every time,like a champion,lol,the tech would know this,p.s ,there is a list for updates to not choose but to accept,so I don't and can't help anymore here than to educate on the proceedure that is typical for programing,wow ,alot of ink I wasted eh?'anywho ,good luck ,ps I hope I didn't confuse you/anyone.

 

Ok thanks. So have you seen this being the case with these modules and not communicating? I guess I will send it down for a reflash, thanks so much. I will let you know the result.

Danomite Enthusiast

Danomite

Posted
  • Author
Posted

I am trying to check the pump motor and was wondering if you had any specs on its resistance? Thx. Also, can it be checked with the module attached or only with it removed?

Danomite Enthusiast

Danomite

Posted
  • Author
Posted

This one is fixed. We removed an alive and a dead rat from this vehicle a couple weeks ago. So I had suspected some chewed wiring....but never found any... Unfortunately is was well hidden, but I found a broken/chewed wire near the engine compartment fuse box. What or where this wire went, I am unsure, but it cured my brakes lights staying on and my communication problem. Thanks for the help.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

I was looking up specs and went back and read you fixed it ,good for you ,next time ,just punt it to the dealer ,lol,

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Grumpy Bear
      Slate Electric Truck

      By Grumpy Bear · Posted

      I have thought an EV might have some practical value in extending the life of the ICE members of ones fleet. Now....I'm convinced of it. I've been letting my better half access Raven (Mitsubishi Mirage) for her needs while Dizzy has been in the shop. Being the fuel freak I am and given the fact Raven is capable of over 60 mpg in clean air on a warm day I was taken back by the wife's ability to take a car that had used a half a tank of gas that to that point had returned a value of 57 mpg and return in with a decimating 51 mpg for that same tank in that same day in a 15 mile round trip of short hop errands and a stop in the drive through at Micky D's.  😱   Trust me on this. It would take the remainder of that tank driven on the highway to return that tank to just 54 mpg. This is not a Mitsubishi issue. This is an ICE issue that is magnified in vehicles capable of such high fuel economy values. On a percentage basis your 1500 does the same thing. Short hopping an ICE consumes a good deal more fuel and in doing so provides zero additional useable outputs. That entire volume of fuel is wasted in diluting the cylinder walls oil films, creating crankcase moisture and acid content and the resultant wear.    Enter the SLATE. All of that is avoided and the ICE's advantage in range and made useful at reduced wear for your ICE!   Kind'a cool. 
    • KARNUT
      Slate Electric Truck

      By KARNUT · Posted

      Back in the day people would buy cars based on performance. The charger posted does 0-60 in 3.3 seconds. And it’s fully loaded.  It has a decent warranty and will fit most anyone’s needs. Remember the original Hemi? 90 day warranty. 25K mini truck or that car? I’d go with the car. It wouldn’t fit my perimeter. If I could just talk my wife out of her Genesis. It would be perfect for her.
    • Atlas
      Slate Electric Truck

      By Atlas · Posted

      Let's pivot this back. Someone said they wanted pictures.   Even better, there's already video. Pre-prod prototypes are already on the road and they're letting the press drive them.   JerryRigEverything did a good review. I really enjoy his content and EV adventures, so I was thrilled when he had the chance to review a Slate:    
    • Grumpy Bear
      Slate Electric Truck

      By Grumpy Bear · Posted

      Interesting pivot.  
    • Atlas
      Slate Electric Truck

      By Atlas · Posted

      The Charger EV was stillborn. Wrong car at the wrong price for Dodge's intended audience. Now at a good price with fire-sale discounts, and still not selling, it's still very much the wrong car. Again, Dodge's intended audience. I believe a lot of Stellantis' EV blunders were all under Tavares' regime at Stellantis...the board convinced him to move on. Neat car, just wasn't received on the level that would sustain mass production.   Dodge is headed in a better direction for its core business. I didn't think there was anything left to get excited about re: the Durango after its 15 year run, but they're just now releasing a 392 version that should price out in the low 40's. Nicely done. I'm not sure I would touch anything Stellantis makes with a 10' pole these days, but the Durango is still mostly parts designed like 3 parent companies ago so maybe it's still OK?

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...