One problem related to alternator/generator/regulator has been reported for the 2003 Chevrolet Tahoe. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Chevrolet Tahoe based on all problems reported for the 2003 Tahoe.
We own a 2003 Chevrolet Tahoe that was purchased in December 2002. As of November 2007, it has 82000 miles. A few days ago the speedometer suddenly stopped working while driving on highway. About 45 minutes later, after a stop, it began to work again. At the same time, voltage gauge on instrument cluster was pegged all the way to the right giving false reading of 19 v. Later, that gauge corrected itself only to act erratically again. Very unnerving to drive at night when the speedometer went out. In addition, we thought we were having alternator problems due to the faulty voltage reading. I have since taken the Tahoe to my chevy dealership for inspection and they mentioned the recent letter from general motors detailing that this instrument panel cluster problem is rather common. We are now waiting to hear back from the dealership to see if gm will pay for the replacement since we are technically over the mileage allowed (70k) by gm.