C1274: OBD-II code C1274 flags a fault in the right front TCS prime valve — traction control cannot pre-charge that wheel's brake circuit for a rapid TCS event.

Symptoms

• ABS, traction control, and stability control warning lamps illuminate together and stay on continuously after start.
• Traction control interventions on the right front wheel are unavailable or noticeably slower to engage when the tyre slips.
• Standard braking and ABS pedal feel are usually unaffected; the fault is specific to traction-control priming.

Common causes

• An electrically open, shorted, or stuck TCS prime valve solenoid coil inside the BPMV assembly.
• A failed EBCM internal solenoid driver that cannot properly command the prime valve during a TCS event.
• Corroded connector pins between the EBCM and the BPMV on assemblies where they are separable components.

What to do?

Command the right front TCS prime valve with a bi-directional scan tool and monitor solenoid current or listen for the audible click. If the valve doesn't operate or draws abnormal current, replace the BPMV/EBCM assembly and reprogram. Inspect any accessible EBCM-BPMV connector for corrosion first.