What to do if your 4×4 is not working?
What to do if your 4×4 is not working?
If all your 4×4 fuses and wiring are intact with no lights at all your tccm would be the first thing to do. If you notice afterward that it shows a normal 2 hi but malfunctions in 4wd try the steps above. Any noise along the way pinpoint it and have that component inspected.
Where is the TCCM located on a truck?
The TCCM is located behind the glove box, and is accessed from underneath the dash. To remove, the kick panel and black cover come off. Then a 1/4″ screw holds the “brains” in the dash. The middle computer is the Truck’s brain, the one on the backside is the TCCM, and on the front is the small ABS computer.
How does the 4WD system work in a Blazers?
If you want 4 Lo the TCCM commands the encoder motor on the transfer case to switch a lower gear in (requires putting the shifter in Neutral and be stopped or only going 2-3mph). Note that if 4 Hi selected no action done in the transfer case.
Why is my GMC Yukon 4×4 not working?
The truck has never been in accident that I know of so there is no damage to the front axle. The truck has 190k on it, but the engine only has about 60k. The noise it was making last winter sounded like it was coming from the front axle. It sounded like a wheel bearing or a rear end whine but I only heard while in 4wd.
What happens if the TCCM is not located?
If necessary, it may also trigger off the front differential locking actuator. If the shift is not possible, the selector switch will come on and flash for 30 seconds. Locating the TCCM is not tough.
The TCCM is located behind the glove box, and is accessed from underneath the dash. To remove, the kick panel and black cover come off. Then a 1/4″ screw holds the “brains” in the dash. The middle computer is the Truck’s brain, the one on the backside is the TCCM, and on the front is the small ABS computer.
What is the transfer case control module ( TCCM )?
The Transfer Case Control Module (TCCM) is a specialty of the General Motor’s 4WD operation.
When do you know when your 4×4 has failed?
You will probably know when your 4×4 has failed when you needed it in the mud pit. Mine, for instance, failed by not doing anything when I hit the 4HI button. However, it would go into 4LO. The lights on the 4×4 indicator (switch) will flash in a pattern, there are only 4 codes, one flash is code one, 2 flashes is a code 2, and so on…
