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Will not shift into 4-wd

Will not shift into any 4-wd modes when selector switch is turned.4-wd light flashes that is all that happens.

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2003 Silverado 4WD. Service 4WD dash light comes on after engaging 4WD and acts up by engaging itself randomly for several days, then goes back to normal.


Check connection at the 4X4 control module , check power and grounds . Do you know how to do basic electrical testing ? Does your truck have manual or automatic trans mission ? Which transfer case does yours have ?

The NVG 263 transfer case features a three button shift control switch located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module (TCCM) starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position begins flashing to inform the driver that the TCCM has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been engaged. Once the new mode/gear position is fully active, the switch indicator for the new position remains ON constantly. In the event that the TCCM can not or will not complete the shift, the indicator returns to the previously selected position; this is a Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode condition.

The NVG 263 transfer case provides the driver with 4 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
• Neutral
Have it check for DTC'S - diagnostic trouble codes ?

DTC B0790
DTC B2725
DTC C0306
DTC C0327
DTC C0359
DTC C0379
DTC C0550

Your best bet would be take it to a qualified repair SHOP

Dec 28, 2016 | Cars & Trucks

1 Answer

Does anyone know how to reset the service reminder on a 2015 isuzu d-max 2.5 twin turbo?


I would ask the dealer to do this but here is what I show to get the light reset. This is courtesy of expert Techmecho

If the tech 2 device is indicating the code for 4wd module then it has to be replaced.Get the module and its connections checked before going to replace the module.If the module connections are getting short or loose then getting the connections repaired solves the problem.But most probably when it shows module problem,the module has to be replaced.The actual testing procedure is as follows:--- If you have an ODBII code reader, you can check if there are any codes stored in the ECU. There is also a diagnostics mode you can go into for transfer case issues:

1. Warm up the engine. Turn it off.
2. Turn the ignition switch on and off at least twice, then turn the ignition switch to off.
3. Shift into park.
4. Turn the 4WD selector to Auto.
5. Turn the ignition switch to on. Do not start engine.
6. Is the 4WD warning lamp on? Continue if no.
7. Shift into reverse.
8. Turn the 4WD selector to 2WD, Auto, 2WD.
9. Shift into drive.
10. Turn the 4WD selector to 4H, Auto, 4H.
11. Shift into neutral.
12. Turn the 4WD selector to Auto.
13. Shift into park.
14. The 4WD indicator light will come on for 2.5 seconds, then go out. It will then flash a series of times to represent a one or two digit code, with half-second delays within a number and 1 second delay between numbers. e.g. to represent the code 23, it will flash twice with 0.5 seconds between flashes, wait a second, then flash three times with 0.5 seconds between them.Get it rechecked again by disconnecting the 4wd module and reconnecting again,. --------------------Thank you.

May 12, 2016 | Isuzu Cars & Trucks

1 Answer

Was driving my 2004mountaineer tool light came on and jumped out gear now won't do nothin bug grind


There are several possibilities. If you have a 4x4, the unit could be between the 2 wheel drive and 4 wheel drive modes. There is also a 4 wheel drive low and 4 wheel drive high mode. On some models the selector switch is similar in appearance to the blower motor selector switch. Someone could reach for the blower speed and turn the 4 wheel switch instead.

Another possibility can be a burned out led indicator switch on models which use electric shift solenoids to position the drivetrain between 2 and 4 wheel drive. The voltage gets messed up because of the burned out bulb and the shift plunger does not go into the correct position.

Have your error message read by a scanner.

May 23, 2015 | 2004 Mercury Mountaineer

1 Answer

Why is the sport mode light flashing on my 2000 Cadillac Catera?


Sport Mode Indicator Lamp and Automatic Transmission Warning Lamp (STL)
The sport mode indicator lamp illuminates when the vehicle has been put into the sport mode by pressing the "S" button on the gear selector. When this lamp is illuminated the vehicle will have slightly firmer shifts and increased performance for part and full throttle situations.
This lamp will also flash when there may be a problem with the automatic transmission. The transmission control module (TCM) performs a continual self diagnosis of certain control functions. The lamp will flash only when an error is detected. The TCM will store in memory a current and/or history trouble code when a problem is detected. I'd have it checked out !

Dec 30, 2014 | 2000 Cadillac Catera

1 Answer

1998 Chevy Suburban - service 4wd light comes on after running 4x4 for 2 mins


Well it could be the selector switch, but I doubt it.
Generally, the service light means something is not working that the computer controls. Solenoids and valves are a couple of possibilities.
The transfer case is shifted by solenoids commanded by the body computer based on the switch position on the dash.
You should be able to have a shop scan the body computer for trouble codes and proceed from there.
A basic code reader may not access the body computer.

Jul 05, 2012 | 1999 GMC Suburban

1 Answer

My isuzu dmax 4x4 manual (year model 2004) have a problem . . . "CHECK 4WD" warning light is always on. isuzu service shop tells me that the 4wd module and actuator needs to be replaced upon...


If the tech 2 device is indicating the code for 4wd module then it has to be replaced.Get the module and its connections checked before going to replace the module.If the module connections are getting short or loose then getting the connections repaired solves the problem.But most probably when it shows module problem,the module has to be replaced.The actual testing procedure is as follows:--- If you have an ODBII code reader, you can check if there are any codes stored in the ECU. There is also a diagnostics mode you can go into for transfer case issues:

1. Warm up the engine. Turn it off.
2. Turn the ignition switch on and off at least twice, then turn the ignition switch to off.
3. Shift into park.
4. Turn the 4WD selector to Auto.
5. Turn the ignition switch to on. Do not start engine.
6. Is the 4WD warning lamp on? Continue if no.
7. Shift into reverse.
8. Turn the 4WD selector to 2WD, Auto, 2WD.
9. Shift into drive.
10. Turn the 4WD selector to 4H, Auto, 4H.
11. Shift into neutral.
12. Turn the 4WD selector to Auto.
13. Shift into park.
14. The 4WD indicator light will come on for 2.5 seconds, then go out. It will then flash a series of times to represent a one or two digit code, with half-second delays within a number and 1 second delay between numbers. e.g. to represent the code 23, it will flash twice with 0.5 seconds between flashes, wait a second, then flash three times with 0.5 seconds between them.Get it rechecked again by disconnecting the 4wd module and reconnecting again,. --------------------Thank you.

Jan 24, 2011 | Isuzu Pickup Cars & Trucks

2 Answers

Flashing 4WH and 4WL lights on the dash with switch position on Auto. What does it mean and what is needed to fix the problem? Car dirves fine.


This is purely a guess, but it seems to point towards the four wheel drive High and Low range, (Transmission)

Jul 12, 2010 | 1998 Ford Explorer

1 Answer

04 Envoy xuv 4 wh. drv. stays in 4 wh drv. HI


Try putting your transmission in neutral and slowly shifting the 4wd selector to each position but you have to wait a few seconds between selsctions as it has to go through your vehicles computer, shifting to fast will cause your symptoms. I hope this helped you out. Roger

Feb 08, 2010 | 2004 GMC Canyon

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