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GM recalling 2013 Buick LaCrosse, Cadillac SRX over transmission software

The National Highway Traffic Safety Administration has issued recalls for the 2013 Buick LaCrosse and 2013 Cadillac SRX due to a problem with the software for the transmission controller. On about 27,000 SRX and LaCrosse models, the transmission could accidentally be shifted to Sport mode, which would reduce the amount of engine braking drivers experience.
NHTSA says this could increase the risk of a crash, but, fortunately, the required fix is simply an update to the software.
While we're on the subject of General Motors vehicle recalls, a small number (48) of compressed natural gas versions of the 2011 Chevrolet Express are also being recalled for a potential risk of fire or explosion. Yikes. Both official recall notices are posted below.

Meet the next president's new Beast, a giant bomb-proof limo

We don't know who will be our president in 2017, but now we have a better idea of how that person will be transported on land. The next presidential limo, officially referred to as the presidential state car, will be another Cadillac. And a big one. You're looking at a lone spy photo of a car that will be of high interest to actual spies – not to mention Secret Service agents and lots of law-enforcement types. President Obama has been riding around in a Cadillac nicknamed The Beast for a while now. (It recently made an appearance on Comedians in Cars Getting Coffee.) Over the Secret Service radios, it goes by Cadillac One and Limo One. While the current car looks like a stretched Cadillac DTS sedan, it's actually kind of huge and built on a Chevrolet Kodiak medium-duty truck chassis. The same is likely to be true again, but this one will look a lot more like the latest Cadillac models. Through the camo we can see a front end reminiscent of the new CT6 large sedan. Imagine one of those scaled to about 5/3 of the production car and you've got the right idea. Fun fact: It will be the first presidential limo to feature Caddy's new wreathless crest logo on its grille. View 6 Photos As for features, we're in the dark and will remain so even after the new president-mover goes into service. The details are a legitimate matter of national security, but you can bet it's bulletproof, can withstand small bombs, and has some kind of onboard secondary air supply in case of a chemical or biomedical warfare attack. Oh, and it has that big red phone in back in the event things get really bad. The new one will no doubt carry the latest communications and safety technology. The new presidential limousine has been in the works for some time. The government sent out a request for proposals in 2013, and this model is expected to go into service sometime in 2017. Chances are it will make its debut at the inauguration of [INSERT CONTROVERSIAL NAME HERE] in about a year's time. Related Video:

2020 Cadillac CT4 spy shots reveal sedan-heavy approach in age of SUVs

You're looking at some pictures of the 2020 Cadillac CT4, which will be smaller than the upcoming CT5. And since they're both smothered in similar-looking camouflage, which is specifically intended to confuse, you might think they look pretty similar. In isolated photos, it's sometimes hard to tell which sedan you're looking at. In fact, when we first saw this car recently, we also thought it was a CT5. Here's how we know they're actually two different cars. Some background: The CT5 is slated to replace the CTS, and to try and find the balance that the old car couldn't achieve in the lineup. Cadillac's former CEO previously stated that this car would also fill in for the ATS, which is on its way out. Whatever it ends up being, it'll have to make a clear case for itself against the CT6 — it can't be too close in size and opulence, or they'll hurt each other in sales. And the CT5 can't be too small, or it will struggle against traditional midsize luxury cars. The CT4 could further complicate matters for the exact same reasons, just in a smaller package. How small can Cadillac make it? It seems poised to replace the wonderful-to-drive ATS, which was as allergic to sales as the XTS. This will give Cadillac a three-sedan lineup: CT4, CT5, and CT6. Let's hope there's enough differentiation between them to prevent consumer confusion and sales cannibalization — and that consumers understand the CT6's promotion via attrition to top dog in the sedan lineup. With all that out of the way, let's look more closely at the CT4 (above left) and CT5 (right). The CT4's greenhouse stops closer to the centerline of the rear wheels than the CT5's. That gives the CT5 a visually longer, leaner look, more of a semi-fastback arrangement. The CT5's rear vanity window should resemble the CT6's, with a glass element behind the door opening. The CT4 will have a more conventional vanity window in the door, like the ATS. Perhaps the quickest "tell" is the size of the side-view mirrors, which are rounder in the CT4 and leaner in the CT5. Out back, the CT4 has a lower cutout for the license plate than the CT5. The exhaust outlets are also different, although that may change for production. Remember, the big full-width rear lights are probably misdirection on the part of the GM camo team. The entire rear decklid of the CT4 has more roundedness to it, while the CT5's extra width gives it more room up top to spread the decklid out a little flatter.