C1276

Circuit Description
DTC C1276 identifies a brake solenoid valve that cannot be energized. The malfunction may be caused by one of the following conditions:
^ An open in the solenoid valve circuitry
^ The solenoid valve is always energized due to a short to ground in the solenoid valve circuitry between the EBCM and the brake solenoid valve.
An open will not allow proper ABS operation, but the short to ground simply turns on the brake solenoid valve. A path for base brakes is still allowed once the motor rehomes and the check ball is lifted off its seat during key to ON initialization.

Conditions for Setting the DTC
DTC C1276 can set only when the brake solenoid valve is commanded off while the Electronic Brake Control Relay is enabled.
A malfunction exists if the EBCM detects the left front brake solenoid valve control circuit voltage is not within specifications.

Action Taken When the DTC Sets
^ A malfunction DTC stores.
^ The ABS disables.
^ The ABS warning indicator turns ON.
^ A rehome is commanded to ensure the motors are in the home position.

Conditions for Clearing the DTC
^ The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
^ 100 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition OFF.

Diagnostic Aids
The following conditions may cause an intermittent malfunction:
^ A poor connection
^ Rubbed-through wire insulation
^ A broken wire inside the insulation
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction.
Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Poor terminal-to-wiring connections
^ Physical damage to the wiring harness

Test Description
3. This test checks for a short to ground in the left front solenoid valve circuit.
4. This test checks for an open in the underhood junction block.
5. This test checks for an open in the battery feed circuit of the solenoid.
6. This test checks for an open in the left front
7. This test checks for an open in the control circuit of the solenoid.
9. This test determines if the malfunction is caused by the EBCM.
10. This test checks for a short to ground in the left front solenoid valve.








DTC C1276 LF Solenoid Circuit Open or Short to Ground