[Adams David]

Just came back from Knoxville to elpaso. Truck did great whole trip. Stopped at home next day truck wouldn't move felt like in high gear put in 2 it moves easier. No codes. Solenoid pack has power but not getting ground on harness when un plugged. New position switch and vss. Need help

 

[Adams David]

Before this goes. Replaced netural saftey switch and vss already starts in p and in n no issues. Need to know what to do before I spend all this time and money to pull and send this back.

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[Mark Kovalsky]

The solenoids should get power anytime the key is on. Grounds are supplied to the solenoids by the PCM when the PCM wants to turn on a solenoid.

If the harness grounds are not good the PCM can't ground the solenoids, so they won't turn on. If the solenoids are off the trans will stay in fourth gear. If you move the shifter to the 2 position, it will go to second gear.

 

[Adams David]

The solenoids should get power anytime the key is on. Grounds are supplied to the solenoids by the PCM when the PCM wants to turn on a solenoid.

If the harness grounds are not good the PCM can't ground the solenoids, so they won't turn on. If the solenoids are off the trans will stay in fourth gear. If you move the shifter to the 2 position, it will go to second gear.

They get power. So do u think ecm is bad. Cause I'm not getting ground signal using a dvm when on jack stands and in hear to solenoid 1 or 2. What sound I try. It just happened out of the blue from one day to next.

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[Mark Kovalsky]

Are the PCM's grounds good? If the PCM isn't properly grounded it can't ground the solenoids.

 

[Adams David]

Where would I check sir

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[Mark Kovalsky]

Get a wiring diagram for your truck. It will show where the grounds are located.

 

[Adams David]

Ok will try finding it with Mitchell on demand

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[Adams David]

Will it be ground to the solenoids or actually ecm ground. Truck starts and idles fine

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[Adams David]

This

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[Adams David]

Ground signal will come from ecu all times for gear selected if command for first correct. So if no signal bad ecm?

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[Mark Kovalsky]

Will it be ground to the solenoids or actually ecm ground. Truck starts and idles fine

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PCM ground. The solenoids are grounded through the PCM, and only when the PCM wants them on.

 

[Adams David]

Well did continuity check on trans harness from plug to plug and it's good. Has to be ecm cause no ground signal unless that little jumper from ecu to harness is the issue

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[Adams David]

Well no ground signal from.ecm. whole harness checks out good. Guessing bad ecu.

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[Adams David]

So got ecu back sia electronics said my trans circuit was bad. Put a good known ecu in the truck. Same dam thing. I need help asap.

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[Adams David]

What can I do

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[Adams David]

Also if I grand the ss1 and ss2 ground wires from pcm I hear them click again I teat that whole harness and have continuity. About to scrap this truck.

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