Saab 2005 1.9tdi abs light coming on getting code c0800 and code c0050

who did the work?

check abs sensors conectors

C0040 ABS light on GM Saab Ricks Free Auto Repair Advice

The abs light , when on turns off the traction control thats why that light is on,once the abs is repaired the traction light will go out, you need to first have the computer scanned for codes, the codes for the abs are stored in the abs computer, these codes will tell you what part of the system is not working. most of the time its a wheel speed sensor but scanning the codes is needed to find out,

You will need to have your car's ECM (Computer) read by a OBD II scanner to determine what Trouble Code your ECM is giving so a mechanic can properly diagnose the problem. You can go to your local AutoZone store and they can pull the codes out of your ECM for no charge.

when the ABS light comes on you will not hear or feel anything cause soon as the ABS light comes on the ABS is disabled
sounds like it is weather related (rain,snow)
i would check both rear wheel speed sensor harnesses for water intrusion if you see any corrosion (green) on the terminals replace both the hub and harness
if there is no corrosion then check resistance of the sensor also check for a short to ground
if that is ok then put some dielectric lube on the wheel speed sensor terminals and clear the codes and see what happens
intermittent problems can be hard to find
hope this helps

check the speed sensor and also the abs wheel speed sensors. most likely its going to be speed sensor in trany,good luck

Check connectors,pins grimping force,bad contact between pins in main plug connector(abs unit)or connectors near pilar A left.
Good luck!

The ABS light should only come on when there is a problem in the ABS system: a wheel sensor or hydraulic unit problem.

The ABS system shouldn't be interconnected to the engine system so that an ABS fault shuts down the engine. Are you sure as to cause and effect? Could a shorting out of the ignition switch (thereby switching off the engine) be lighting the ABS lamp?

Get a wiring diagram and check for good grounds at the appropriate locations for a 1990 SAAB; also check for possible shorting out of the ignition switch under fault conditions.

The best source of info on this car is the "Bentley Bible" aka the Saab 900 Official Service Manual, costs about $40 from Amazon!

16 valve manual: http://www.amazon.com/Saab-900-Valve-Service-Manual/dp/0837603137

8 valve manual :http://www.amazon.com/Eight-Official-Service-Manual-1981-1988/dp/0837603102

The ABS system is complex, and best worked on by a trained and trusted professional.

Hope this points you in the right direction!

Saabreur

U NEED A SPECIAL SCANNER TO GET ABS CODES, A GENERIC SCANNER WILL NOT WORK.