adg44

So I was giving one of my friends a ride in my 04 C2, and while at the top of third gear, the ABS and PSM lights came on, and the MFA said drive to dealership, ABS fault, etc. Then I shut the car off and turned it back on and the lights were no longer illuminated and there was no warning on the MFA.

Any ideas what would have caused this?

Pac996

Check to make sure the ECU has a solid connection and the ground is good. Not sure if a low battery voltage would cause the error but see if the electrical is good.

If your ECU has been flashed it wouldn't hurt to redo it to make sure it isn't corrupted. If it’s a send the unit away deal then contact them and wait for more answers here because it might be a sensor inputting erroneous errors to cause it.

I had a disabling error on a bike flying past 8500rpm with plenty left. Accelerating slow the error wouldn’t happen. Turned out the power commander had a new flash that solved the problem.

All I can think is since it’s so many errors at once it covers everything. Only thing I can think of is an ECU foul up. What causes it is not enough or too much electric, bad flash or something like a sensor output goes into an abnormal input to it. Hopefully somebody has a history of this and knows a quick and simple cure like reconnect a loose sensor or ground.

Ahmet

Probably a wheel speed sensor has an intermittent connection, I do not imagine that it's related to the engine or ABS computer.

RAC

MAF

Pac996

Secret service electronic jammers

pete95zhn

Bad MAF or brake light switch at brake pedal. Do a search, this issue is covered several times earlier.

rb101

+1 MAF

adg44

Really? The MAF causing an ABS and PSM fault?

For what it's worth I have a GIAC 93 chip and EvoMS V-Flow Intake. However, only 18,000 miles on the car and there is no throttle lag or lack of power that would suggest a bad MAF.

rb101

for some crazy reason, a bad MAF will effect the ABS/PSM fault. When my MAF went south, going over 4500 rpm would cause the ABS and PSM lights to come on.

Rick
99 996C4
87 944S

RAC

Same thing for me too. Same year and make car as yours Rick.