Check engine light came on today on the way home. 08 SG with 40K on the clock.
P0572 is the code.
Anybody tell me what that is?
Thanks
Randy

 

From the EDM:

GENERAL
Brake Switch
There are two stop lamp switches. The front stop lamp switch
is a mechanical switch located on the right hand controls. The
rear brake switch is a pressure switch located in the brake line
under the exhaust pipes.
On vehicles not equipped with Antilock Brake System (ABS),
when the stop lamp switches are closed they supply power to
the coil side of the brake relay. This energizes the brake relay
and supplies power to the stop lamp. The stop lamp switches
also supply an input to the ECM.
On vehicles equipped with ABS, when the stop lamp switches
are closed each switch supplies a separate input to the ABS
module. Power is also supplied through the ABS diode pack
to the ECM (as a brake input) and to the brake relay.The brake
relay energizes and supplies power to the stop lamps.
During an ignition cycle, the ECM must receive a valid brake
switch input. Then during the same ignition cycle the vehicle
has to reach 31 MPH (50 km/h) in third gear or higher and
return to a stop three times with out any brake switch signals
in order to set DTC P0572.
Table 4-48. Code Description
DTC DESCRIPTION
P0572 Brake switch input error
DIAGNOSTICS
Diagnostic Tips
• Check that the rear brake reservoir has the proper amount
of brake fluid, and there are no apparent leaks. If fluid is
low, the rear brake switch may not receive sufficient
pressure to actuate the switch. Replenish brake fluid in
the brake reservoir(s), as necessary.
• An intermittent may be caused by poor connection, rubbed
through wire insulation or a wire broken inside the insulation.
Check for the following conditions:
• Poor connection: Inspect component and harness connectors
for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, poor terminal-
to-wire connection and damaged harnesses.
• Fluid leaks: Check the rear brake switch for fluid leaks
around the seal of the switch. Refer to Service Manual to
repair a fluid leak.
Diagnostic Notes
Each reference number below correlates to a circled number
on the flow chart(s).
1. When checking the (O/W) wire, from the accessory fuse
for a short to ground, remember to check the wires on the
other side of the switches for shorts to ground as well.
These circuits could cause a short to the accessory fuse
but ONLY when the switch is closed. The accessory fuse
circuit supplies power to the cigar lighter, horn, left and
right turn signal switches, front and rear brake switches
and the cruise control switch.

 

You went above and beyond what I expected.

Thanks for all the great info.