You won’t be able to determine the cause of the P25A2 code with just this code. It’s a generic code that only indicates the brake module has detected a serious problem to request the vehicle turn the check engine light on. That might mean anything from deep engine issues to a problem with the battery level or issues with connector pins. You’ll almost always see additional codes that will give you insight into the core problem. In some cases, the problem might lie with a faulty brake system control module or PCM programming failure, but these are the least common causes of the code, so you should look for other causes as well.

It depends on the actual underlying cause of the code. If the problem has to do with your parking brake, for example, you’ll be more likely to be able to physically drive your vehicle, rather than if the problem is with your actual brake pedal. Problems can also come from communication diagnostic trouble codes (DTCs) or software code issues. However, regardless of the cause of the code, you should avoid driving with the code anyway. You don’t want to worry about how effective your braking system is when driving.

As with diagnosis, inspection for the P25A2 code can be difficult. You must use your diagnostic scanner to read other codes and determine the problem. This code doesn’t tell you almost anything about the core problem, meaning you’ll need to gather as much information as possible outside of the P25A2 code to fix the problem. If you aren’t confident in your ability to do this, especially if you’re not experienced with fixing problems in the brake control module, it’s a good idea to talk to an experienced mechanic instead.