OBD-II Fault Code

C1406: Traction Control Valve Rear Circuit Short To Ground

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for C1406.

System family

Chassis

Manufacturer-specific

Repair category

Electrical circuit / sensor

Use this category to narrow your checks before replacing parts.

Severity

Medium

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What C1406 usually means

Traction Control Valve Rear Circuit Short To Ground.

Common symptoms

ABS/traction/steering/suspension warning lamp or abnormal chassis behaviour

Likely causes

Wire shorted to chassis/ground; Internal component short

Diagnostic checks

Inspect wheel/brake/suspension area, connectors, sensor wiring and module power/ground; Inspect harness for rubbing/pinch points and check resistance to ground

Repair guidance

Repair insulation/harness damage or replace internally shorted component

Verification after repair

Clear code, road-test safely at low speed first, then rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary; Manufacturer-specific: confirm definition and test steps in the vehicle service manual. A DTC identifies a circuit or system condition, not always the failed part.