(Sources: Consumer Reports, Detroit Free Press, Wall Street Journal & CNN Money)

Consumer Reports magazine dealt Toyota Motor Corp. a blow Tuesday issuing a rare “don’t buy” recommendation for the 2010 Lexus GX 460 sport-utility vehicle.

Four of the magazine’s auto engineers found a safety risk during their standard emergency-handling tests.  The specific problem, according to the magazine’s testers, involved the slow reaction of the vehicle’s electronic stability control system when a driver takes it through a turn while quickly lifting his or her foot off the accelerator. Consumer Reports explained the problem in detail on its website as follows:

In real-world driving, lift-off oversteer could occur when a driver enters a highway’s exit ramp or drives through a sweeping turn and encounters an unexpected obstacle or suddenly finds that the turn is too tight for the vehicle’s speed. A natural impulse is to quickly lift off the accelerator pedal. If that were to happen in the GX, the rear could slide around far enough that a wheel could strike a curb or slide off the pavement.

Either of those scenarios can cause a vehicle to roll over. And because the GX is a tall SUV with a high center of gravity, our concern for rollover safety is heightened.

Like almost all current SUVs, the GX has standard ESC. That system is designed to prevent a vehicle from sliding out in a turn and has generally worked very effectively in the vehicles we’ve tested. It does that by applying individual brakes and cutting engine power to help keep the vehicle on its intended path. But the GX’s system doesn’t intervene quickly enough to stop the slide, and the rear end swings around too far.

“All four of Consumer Reports’ auto engineers who conducted the test experienced the problem in an exercise used to evaluate what’s called lift oversteer,” the magazine said in a statement.

The special designation given to the GX 460 by Consumer Reports — “Don’t Buy: Safety Risk” — is rarely given by the magazine. The last time it was used was in 2001, on the Mitsubishi Montero Limited.

“We’re concerned with the results,” said Toyota in a statement, adding that the company will try to duplicated Consumer Reports’ test “to determine if appropriate steps need to taken.”

About 5,000 GX 460s have been sold in the roughly three months the model has been on sale, the magazine said. It advises current owners of this vehicle to approach exit ramps with caution, and to call Toyota demanding a fix for the problem.

The recommendation comes as Toyota tries recover from a safety crisis that has hurt its reputation as a quality leader amid concerns that its Toyota and Lexus products are prone to sudden acceleration.

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