The “Check Brake System” comes on intermittently for the past several months. Dealer replaced the brake control, module, and hose for $3,000 (diagnostic code on invoice was B1634). Three weeks later, “Check Brake System” light is came on again (before the fix, I had gone up to a week between light coming on).
I take it back, they do the diagnosis and say it is due to a completely distinct issue - now I need to replace the brake vacuum/booster (code C1015:64). It’s strange I am having multiple parts fail all giving “check brake system” over a short span of time on a car with only 67k miles. I question if the root cause of my car’s problem has actually been identified . Are the codes a reliable way to diagnosis my car’s problem? Is there something that could be failing/malfunctioning that would create issues in these different brake system parts? Or is it really just bad luck? I have noticed no difference in how my car drives.
Thank you for any insight you can provide,
Kelli
Ok, the first trouble code B1634 is a body error telling the right mirror adjustment motor is bad, not a brake code. A brake code would be a C code. The C1015:64 is a vacuum supply problem. Faulty vacuum sensor or vacuum pump. I would think replacing the sensor, not the booster would be the solution.
Error codes are a guide in a diagnostic troubleshooting process, NOT, a “replace this part” instruction. So, no, the dealer has not found the core problem(s). I think you should have the service writer, or the service manager explain why you paid $3000 for a mirror code and why they think swapping the booster will fix a sensor problem. The answer or lack of one will determine if you should change dealers.
I suspect they are guessing and changing parts rather than actually diagnosing the problem(s). The flip side is a hybrid is a complicated car that is expensive to repair.