Toyota’s ongoing recall and the safety concerns embroiling an automaker that climbed to the top of the global car market through a reputation for reliability, may offer an opportunity for competitors to seize market share, at least in the near term. But Toyota’s troubles, which most recently have spread to the automaker’s 2010 Prius hybrid model, could also offer something more lasting to companies ranging from General Motors to startups Fisker Automotive and Tesla Motors as they race to crank out plug-in vehicles: lessons in what works — and what doesn’t — when it comes to cultivation of rapid growth and a green halo.
In an automaker’s lineup, a “halo” car is meant to cast a positive glow over a company or brand — showcasing technology, styling and smarts while also helping to define what the brand stands for and luring customers into showrooms to buy other models. The Prius did this to such remarkable effect for Toyota that the industry took notice. As GM-Volt tells it, the status Toyota acquired as “a media and environmental sweetheart” through the halo effect of the Prius helped inspire GM’s push for the plug-in Volt. But hanging so much of your reputation on one model also carries risk — and that can get lost in the green glow.
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What can General Motors do with five months, an 
