Question about 2001 GMC Sierra 2500HD

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Won't start unless I wiggle shift lever on the column

2001 2500hd 4wd extend cab pu.

Truck runs great! but, when I stop and have to restart, the engine turns over, but the engine wont't run until I jiggle the shift lever on he column. Then the engine starts first time. It is not the PRNDL. No other problem except that. Truck has 225000 miles. Replaced transmission a year ago. No problems.

Buddy

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There is a neutral safety switch on the transmission. You may need to change this.

Posted on Mar 10, 2009

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Look under dash where steering column is. Find the connection for the shift cable. see if the mount that the cable end connects to is loose. wiggle it. If it is there are 2 torx screws that mount the bracket to the shift tube that you need to tighten. I think they are a T-27 size bit. This is a common problem on fords. easy fix. I usually will take the screws out and use a thread locking compound in them to stop it from happening again.

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How do I turn 4wd on?


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2003 F-150 regular cab automatic transmission and the 4WD will not engage.


Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).


Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
- If it turns it is a problem with the transfer case.
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- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
{ picture of shift motor }
-- If the vacuum shift motor does not move:
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•Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
•Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
•Check the vacuum reservoir box for cracks.
•Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
•Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_111.jpg

- If the front drive shaft turns:
•For ESOF system
-- Check the fuses for the transfer case, engine compartment fuse panel, 17 & Cab fuse panel fuses 13 and 23 ( verify with owners manual, 97-97 & 99-03 MY can be slightly different on some items ).
-- Try hitting the transfer case with a dead blow hammer ( do not use a metal hammer, it can damage the transfer case ) to see if the transfer case shift motor is hung up .
-- Check the transfer case connector, to make sure the connector pins are clean and making good contact.
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-- Check that the shift linkage on the transfer case is moving when the lever is moved from 2W to 4H and 4L.

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If your problem is that you can't move the shift lever, some require that you put your foot on the brake before the shift lever is unlocked. It is either cable or electrically locked. If that is the case, you can bypass the lockout by removing the steering column cover and pu;;ing the cable or solenoid. I don't remember the exact procedure, but as I recall, it is relatively simple to do.

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What happened on mine was a gear shift linkage connection under the dash (to flanges attached with 2 small bolts) came loose and one of the bolts fell out.
Best way to check if this is your problem: if you take the fuse panel access cover off (driver's side lower dash by the door) , then while looking up at the underside of the column, wiggle the shift lever. You'll see the flange and bolts just off the the right of the column.
If this is the problem and you can find the bolt, reinstall and tighten both bolts.
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K

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