Code Definition

C1406 — Traction Control Valve Rear Circuit Short To Ground

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Generic

About C1406

C1406 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1406 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1406 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The C1406 fault code indicates the ABS or traction control module has detected a short to ground on the rear traction control valve circuit. The rear traction control valve is a solenoid valve inside the ABS hydraulic control unit that modulates brake pressure to the rear axle during traction control and stability control interventions. This code is specifically set when the module detects excessive current flow indicating the valve coil control wire is shorted directly to chassis ground, either through a damaged wire, a shorted valve coil winding, or a faulty internal driver. When this code i...

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