Discovered a code U0140 - any suggestions to cause?
I know what the code means (lost connection with BCM), I'm just wondering what I can do to chase it down. I only found it by chance, because it didn't set a CEL. We'd had a CEL show up a week or so back and it turned out to be a misfire code (a coil pack was going bad), so yesterday I just thought I'd do the key dance to see if anything else was hiding in there, and bingo.
My feeling is that if it's not serious enough to set a CEL, it's probably nothing to worry about too much, and could have been a one-off. It wasn't there 2 weeks ago, and since then we've had one incident where I had to stand on the brakes to avoid a collision with a water tanker that swerved into our lane. I was wondering if perhaps the force of that might have caused a connector to the BCM to lose contact briefly?