Need Some Help. Multiple Warning Lights

[just2talented]

Ive searched the other threads of of similar issues but I think mine might be a little different.

I intermittently get a YELLOW ABS light, a RED HAND BRAKE LIGHT, a YELLOW TPMS LIGHT and a YELLOW TRACTION CONTROL LIGHT.

All lights come on at exactly the same time, usually at around 3-3500 RPM. When they come on, I can notice a very slight drop in power and my radio cuts out but does not shut off, just no sound, time still shows.

I had one mechanic run obd to see what codes popped up, he got some voltage warning codes but he couldn't confirm exactly what it was.

Having read the other forums, im starting to think its either the voltage regulator, or the whole entire alternator.

Im also gathering that it could be a wheel speed sensor or a dsc module, or a abs monitor, or the MAF sensor?



if somebody can help me out, id be very very thankful!

[Clearancediver]

I would check your alternator to see if it's the voltage regulator. Check output voltage at idle and at 1500/2500 etc..... Does the voltage stay the same or does it increase with increase in rpm.... If it increases in a consistent manner it's likely the voltage regulator is not working. Voltage output should be in the 13.7 - 14.5 range.

[Finnegan]

I believe this is exactly what you'd see with:

Alternator
Voltage regulator

Including the rev range link. Trick is properly diagnosing. Have a look here. Discussed in great detail. http://www.zpost.com/forums/showthread.php?t=669131

[donoman]

Try to turn the headlights and AC on to load the system as much as possible and see if it does this more than without a load on the system. It's hard to determine what is going bad but you will be able to electrically test these components, I believe.

You can pull your MAF, ABS, etc fuses to temporarily disable those systems to isolate the cause of the voltage drop.

[mbanshchikov]

is your roll back hold working?