Hello Oddy Club members. I hope you all can help me narrow down a problem my sister is having with her 2002 Odyssey. The battery kept draining while driving. Her husband replaced the alternator and battery several times during the last several months, which told me that was probably not the issue. Diagnosed an issue that the positive battery post was not getting a good connection at all, while the alternator and battery showed proper and consistent voltages after repair, and did not appear to have worn bearing providing extra resistance. However the vehicle still dies, which I believe is due to another unrelated, but coincidentally timed issue.
While driving, it will run fine for some time before suddenly it starts losing power, radio shuts off, gauges stop working, and certain dash lights come on, such as TCS, ABS, and all the door open indicator lights. After limping it home, it wont restart, which I'm guessing the battery ended up drained again, but I am not physically there to diagnose again. I suspect the PCM is getting interrupted, maybe due to a bad relay. I'm not certain if that would cause all of these issues at once. The oil level looked slightly low, but nothing significant. Transmission fluid is adequate. Not sure when the spark plugs were changed, and I suppose an ignition coil could be bad, but I didn't notice any misfires during the test drive last night.
TLDR: Engine loses power, dash lights come on, gauges shut off. Battery drained.
- Battery and alternator voltages test good.
- Battery posts and connections cleaned and repaired.
- Serpentine belt is new, appears in good condition.
- Pulleys don't appear or sound as if they are worn.
- Oil level was slightly low, but decent.
- Transmission fluid is adequate.