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Chevy Tahoe LT Troubleshooting

Are the fuses on your Chevy Tahoe LT repeatedly blowing? Are you having problems engaging 4WD? Being sure of what is wrong and how the problems can be rectified means that you can make informed repair decisions. Whether you plan to do your own repairs or go to a shop, you will be in control of the situation. The recommendations of verified mechanical Experts will give you all the information you need.

Here are some questions Experts have answered.

What could cause the DIC and PRND lights on a 2007 Chevy Tahoe LT to stop working?

Case Details: The vehicle runs perfectly; only the lights do not work.

The DIC and PRND lights are controlled by the instrument cluster and all operate off the same fuse. Although a fuse issue is unlikely, check it and the wiring to it and replace or repair as required. If no problems are found, the cluster is bad and will have to be replaced or repaired by a cluster repair specialist.

What could cause a 1999 Chevy Tahoe LT 4WD, 5.7L with automatic transmission to intermittently grab when making sharp turns at low speeds?

Case Details: The transfer case has been checked and it is okay. The problem occurs in both 2WD and 4WD.

This kind of control issue is often caused by the front right axle not disengaging. The reason is usually a bad actuator. It is located on the passenger side of the differential, just inboard of the CV shaft. Unplug it and remove it using a large set of pliers. Spin it to see if it is extending and retracting as 4WD is engaged. If it does not, it is defective and will have to be replaced.

How to prevent the 50 amp fuses for the windows, wipers and radio on a 1999 Chevy Tahoe LT 5.7L 4WD from repeatedly blowing?

Check the wiring to all the affected components and repair any damage that may be found. Check the fuse connections for signs of corrosion, damage or looseness and replace if needed. If nothing is found after these checks, the electrical portion of the ignition may be bad. Is such cases, repeated fuse failures are common. Replacing the electrical part of the switch should fix the problem. 

Why is a 2006 Chevy Tahoe LT not engaging 4WD and what repairs have to be done?

Case Details: The “Service 4WD” and “Stability Control Disabled” lights are on. The vehicle runs fine in 2WD.

There are three common reasons for this kind of problem. Have the following checked in this sequence:

  1. A bad sensor or switch is the most likely cause. A faulty encoder sensor in the shift motor on the side of the transfer case is a common issue. The surface of the sensor fails over time as the material on the fingers that slide on the surface wears off. If this is the cause, the sensor will have to be replaced.
  2. The solder joints on the back of the push button switch may be bad. Remove the switch and if the joints are faulty, resolder them to the pins on the board that goes into the transfer case.
  3. The least likely cause is an internal failure in the transfer case itself. If the clutch pack has failed, it will put the sensor out of range. This should be checked by a transmission specialist.

Why do the cigarette lighter and front auxiliary outlets on a 2002 Chevy Tahoe 4WD work only intermittently?

Case Details: The rear console auxiliary outlet works okay.

On this model the lighter and the auxiliary outlets share a common ground but not power. When all three fail at the same time, it points to a ground issue. The ground in this case is mounted under the top of the dash, at the far left side. It can be accessed by taking out the A pillar trim. The wiring will have to be traced and checked to find the fault. A simpler solution would be to simply run a new connection from the outlets to the ground. If after these repairs only the lighter works, the AUX Power fuse or the wiring from it has a weak connection. Check this and repair as required.

What is the reason for all the gauges and the DIC on a 2003 Chevy Tahoe LT to stop working and what repairs are required?

There are three common reasons for this to happen. Check the following in this sequence:

  1. A fuse or fuses in either the under hood or inside fuse box may have blown. Check all these and replace as required.
  2. If the fuses are okay, remove the cluster. Unplug the connector. With the ignition in the ON position, use a volt meter to see if the orange and pink wires have 12 volts and if the solid black and one of the black/white wires have ground. If not, inspect the wring for damage and repair as needed. If the wires are okay, then the ignition switch may be bad and it will have to be replaced.
  3. If there are no power or ground issues, there is an internal fault in the cluster which will have to be replaced or repaired by a cluster specialist.

What does a P0121 fault code mean on a 2008 Chevy Tahoe LT?

The code is for a fault with the throttle position sensor. It is built into the throttle body assembly. Inspect the electrical connector and wire harness for any loose, broken or damaged wires and repair as required. Also inspect the throttle plate for carbon build up and if found, clean it with throttle plate cleaner and a toothbrush. If no problems are found, or if these repairs do not fix the problem, the throttle body will have to be replaced.

As this article shows, finding the cause of a problem with your Chevy Tahoe LT can be even more difficult than the repairs. Without being sure of what is wrong, any attempts to fix the problem could lead to bigger issues. The insights of verified mechanical Experts will give you the guidance you need to correctly identify what is wrong and also to know what repairs are required. Experts can be contacted online to give you clear, personalized answers to your questions.

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