Noticed the Abs and brake lights on tried shutting off and restarting truck. Tried disconnecting battery, but soon as I reconnect battery the pump starts running again. Any idea the truck has 12,000 miles on it.

Note just had tranny work done valvebody and triple lock converter. Put about 100 miles on it sense work was done.

 

pull the fuse in the PDC.

 

Thanks, but, what do you think is causing this problem?

 

Does you speedometer work correctly? if not it might be your sensor on the rearend. also check the wiring going to the sensors in the front hubs. That is just a guess though.

 

speedometer works fine. Was told of another case where they changed module on top of pump to fix.

 

Tried unhooking rear axle sensor, transmission sensor, brake fluid sensor. Nothing seemed to clear this out. Unplugged ABS fuse and hooked everything back up. ABS and Brake lights are on but at least the motor does not run this way. Will leave fuse out until I figure it out.

 

There is an electrical connector down under the master cylinder. It is way down in the buried area of the firewall, but look to see that it was not nailed by the transmission housing when the transmission was backed out to swap the torque converter.

 

Can't find any damaged wires. Been doing a google search seems several chevies have had this same problem. They said on thier stuff they had to replace module and pump as one, very expensive. Hope this is not the case even though it is under warranty. It's going to be a pain getting all the no no stuff off before going to the dealer.

 

Update
Had a freind scan the truck with Mopar diagnostic scanner. He suspects the box is bad. He noticed that with the truck sitting still not running that the ABS showed the truck to be running 3MPH. We thought that in itself would cause this problem but no the brakes are not activated so that should not be it. Guess going to have to take it in. Ideas are still welcome as I don't know what the problem is.

 

i have got a 2000 that had the same problem. i had to cahnge the whole pump, a buddy of mine is a dodge parts man afor 7yrsand he said that was the first one he had ever sold. just my luck hope it helps

 

The one other truck I heard of having this problem had to have the module on top of pump replaced. They fix wrecks and had another truck to get one off of. My truck is under warranty. Just wanted to make sure it wasn't a wiring harness deal sense the tranny was just removed/installed last week. Went 100 miles then this happened out of the blue.

 

If the ABS is running when the pedal is not depressed the DC brake scanner will absolutely generate a code unless the combination valve is stuck or the master cylinder is bleeding through the internal plunger area between the front and rear systems.

Also, check your switches on the brake pedal. Make sure they are properly adjusted.

 

What is the combination valve?
What is the proper adjustment of brake pedal switch my pedal are not adjustable?

 

Dealer replace ABS module to fix truck