Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC2005GRAND PRIX V6-3.8L SC VIN 4REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONC CODE CHARTSC0277
2005 Pontiac Grand Prix V6-3.8L SC VIN 4
C0277
2005 Pontiac Grand Prix V6-3.8L SC VIN 4SECTION C0277
DTC C0277
CIRCUIT DESCRIPTION
The body control module (BCM) applies a ground through the brake sensor reference low circuit to the brake pedal position sensor. The BCM supplies a 10-volt reference through the brake sensor reference voltage circuit to the brake pedal position sensor. When the brake pedal is being applied, the brake pedal position sensor then sends a variable voltage signal through the brake sensor signal circuit to the BCM.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC C0277 Brake Pedal Position Sensor Circuit
CONDITIONS FOR RUNNING THE DTC
The battery voltage must be between 9-16 volts.
CONDITIONS FOR SETTING THE DTC
- A short to ground or an open in the stop lamp switch signal circuit is present.
- A short to battery positive voltage or an open in the 10-volt reference circuit on the brake pedal position sensor.
- A short to ground in the I/P dimming voltage reference circuit.
- A malfunctioning brake pedal position sensor or BCM.
ACTION TAKEN WHEN THE DTC SETS
The stop lamps will not function correctly.
CONDITIONS FOR CLEARING THE DTC
- The DTC will clear on current status after the condition for setting the fault is corrected.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- A History or current DTC can be cleared using a scan tool.
DIAGNOSTIC AIDS
Perform a visual inspection for loose or poor connections at all related components.
TEST
Steps 1 - 12:
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.