![]() This means the car doesn’t have to relearn shift points and idle settings. But more importantly it also keeps the on-board memory alive for the power-train control module (PCM). The external power source holds the radio station presets and clock settings. You plug it into the cigar lighter or accessories socket before you disconnect the power and ground cables from the battery. I have the power-built model shown on the right. ![]() ![]() These inexpensive devices are sold at most auto parts stores. On older cars I use a device called a battery tender. In fact, I’ve had the battery out on some Cadillac models for an entire day and didn’t have to reset the clock. If you use the method described below you defeat this piece of engineering. On many luxury cars they store power to hold on to all the vital settings. I know what you’re thinking, what if you have to replace the battery. In addition you don’t want to lose the custom settings like radio stations and power seat memory after getting everything just right. Newer vehicles have a few installed options requiring constant battery voltage. Here’s another reason for not disconnecting the battery. A new U480 CAN-BUS code reader is not expensive at around 19 bucks including shipping. This is how professional mechanics solve car problems. ![]() Fixing the problem could be easier than trying to avoid it. This is why I ask you to consider pulling the codes and following the diagnosis for the specific code set. But we have to remember if this is a hard failure with a sensor or a car computer problem the light will come right back on. If the issue is intermittent, the light may stay off for a while. As a certified professional auto mechanic it’s my duty to let you know what kinds of problems are common when you perform this operation. Yes, there’s a trick for draining the capacitor that holds power for the electronic control module’s stay alive memory. However, if you stick with me I will explain how to reset check engine lights by disconnecting the battery, even on these cars. If the automobile you’re working on is newer, I Do Not Recommend disconnecting the battery.
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