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seen exactly where and how?
does car run and drive> or not.\
abs cluster lamp glowing like mad?
does cranking the engine sound weak.? if yes battery is weak.
does car have secondary battery option/?
that is an ABS failure code but is only covered in the service manual
Definition of Diagnostic Trouble Code U2108
Buick:
CAN Bus Error ABS
Cadillac:
CAN Bus Error ABS
Chevrolet:
CAN Bus Error ABS
GMC:
CAN Bus Error ABS
Oldsmobile:
CAN Bus Error ABS
Pontiac:
CAN Bus Error ABS
Saturn:
CAN Bus Error ABS
Definition of Diagnostic Trouble Code P0722
Category:
Powertrain
Definition:
Output Speed Sensor Circuit No SignalNote: This definition of P0722 is applied to all manufacturers
Most likely you have a defective ABS sensor which is part off the front bearing assembly. you will need have or if you have a code reader capable of reading abs codes find the wheel that is causing the code. Then source the part and if you have the ability to replace it replace it. The code/ light should go out when the abs signal is getting correct information.
Not all OBD-2 scanners are created equal. Most only read power-train (engine/transmission) codes and are not capable of reading ABS codes. Some scanners even have a specific button you have to press to get ABS codes. Try a different scanner. I know places like Auto Zone will scan codes for free but not every store has the same reader. The AZ nearest to me has the ABS capable scanner while the one on the other side of town can't read ABS codes.
The code scanner that you need is called ODBII code reader with ABS, and it works in the same way as the one that you connect to the car computer module (ECU) to read codes when the check engine light comes on, but the cheap ones that you can buy from $50 do not have the ABS brake scan function.
If the problem is the ABS, then it is often a wiring to abs problem, or a defective ABS control module, a scan reading is necessary to know what the problem is.
It may be an ABS sensor... however you'll want to get those ABS codes read. A regular code reader doesn't do that, you'll need a specific ABS code reader or take it to a shop.
RWAL Fault codes Codes for Dodge RWAL, Ford RABS and GM RWAL
applications are similar but have a few differences:
Should not occur (replace the controller if it does)
Open isolation valve circuit or defective ABS module
Open dump valve circuit or defective ABS module
Grounded or closed RABS or RWAL valve switch
Excessive actuations of dump valve during ABS
braking
Erratic speed sensor signal
Shorted isolation valve or defective ABS module
Shorter dump valve or defective ABS module
High resistance or open speed sensor circuit (resistance
should be 1000 to 2500 ohms)
Low speed sensor resistance (Dodge & Ford only)
Open speed sensor circuit (GM only)
Stop lamp switch circuit (Dodge & Ford)
ABS module speed processor (Dodge & Ford only)
ABS module program (Dodge & Ford only)
ABS module RAM memory failure (Dodge & Ford)
To manually clear a stored fault code on GM
and some Dodge trucks with RWAL, remove the ABS fuse or disconnect the battery
for 5 seconds. Ford RABS codes will automatically clear when the ignition is
turned to the off position.
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