Plug-in computer chips come with risk

We recently covered the risks that come with certain modifications and upgrades, but left out one key area: plug-in computer chips.

For instance, you can purchase certain chips for many popular SUVs and pickup trucks that keep systems running correctly when oversized tires or off-road axle gears are installed. The software will interact with various on-board systems to correct wheel and vehicle speed calculations. Most are available through off-road equipment specialty shops.

It’s worth mentioning a few things about these performanceenhancing modifications. These have been around since the beginning of computer-controlled fuel injection and they ’re popular with enthusiasts who look for betterthan-stock performance.

On gas engines, they can advance ignition timing and adjust fuel injection rates, among other things. For diesels, they can boost injection rates, putting more fuel into the recipe. For responsible drivers, these can be helpful additions and won’t usually present problems. But there are risks to consider.

First, all automakers have clauses in their warranties that indicate any damage or problem that can be directly attributed to the installation and use of aftermarket products will not be covered.

For many accessories, this is fairly straightforward. You’re not

likely to be denied a warranty request for a defective water pump just because you installed a liftkit. Similarly, your wallet should be safe if a steering rack failed on a vehicle with aftermarket trailerhitch wiring. But engine controllers and computers touch almost every system, so when you add unauthorized software, you may put a lot of warranty coverage at risk.

Keep in mind, your connection to your warranty pretty much starts and ends with your retailer. If they see a plug-in chip (or evidence of it), they may just close the hood and prepare a retail estimate.

For many performance chip fans, this doesn’t present too many concerns because they either wait until the factory warranty expires, or trust the manufacturer based on past experiences.

But while factory warranties expire, emissions regulations don’t. Many performance chips come with a warning they are not emissions compliant and are only designed for off-road use.

Environment department officers seldom travel the highways looking for heavy emitters, but the long arm of the law does have a way of catching up and the fines can be substantial.