C1205

Code

Other C — Chassis

ABS Outlet Valve Coil Rear Circuit Short To Ground

Brand: Other

Type: C — Chassis

Views: UK: 31 EN: 118 RU: 67

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ABS warning lamp illuminated
Traction control/ESC warning may also be lit
Possible loss or reduction of ABS functionality (longer stopping distances under ABS conditions)
Stored ABS-related freeze frame data and inability to actuate corresponding valve during diagnostics

Read and record ABS trouble codes and freeze frame data with a capable scan tool
Visually inspect ABS rear outlet valve connector and wiring for damage, corrosion, or pinched sections
With ignition off, unplug the valve connector and inspect terminals for corrosion/shorts
Measure resistance of the valve coil with multimeter (see signal_params)
Backprobe control wire with ignition on and observe voltage when ABS commands the valve (use scan tool to request activation if available)
Check for continuity between the control wire and chassis ground (should not be direct short)

Typical outlet valve coil resistance (varies by vehicle): roughly 2–20 Ω (measured at connector with harness disconnected)
Resting control line voltage: ~0 V (ignition off) or pulled low; when activated, module supplies battery voltage or PWM pulses (~12 V nominal)
Current draw when activated: commonly under 3 A depending on design
Pulse/PWM frequency and duty cycle vary by manufacturer—use OEM service data for exact values

Safety first: park, key off, chock wheels, disable vehicle if required, and wear eye protection
Connect a scan tool and confirm C1205 is present; record freeze frame and pending codes
Visually inspect rear outlet valve harness and connector for damage, corrosion, bent pins, moisture, or evidence of rubbing/chafing
Unplug the outlet valve connector. Measure coil resistance across the coil terminals. Compare to expected range (see signal_params). If resistance is very low (near 0 Ω) suspect shorted coil.
With connector unplugged, check for continuity between the control wire and chassis ground. A near-zero reading indicates a short to ground in wiring. Repair wiring as needed.
If no short to ground on harness, backprobe the control harness at the ABS module and command the valve with a scan tool; observe voltage. If module is commanding but voltage is shorted to ground at the module harness, suspect internal module fault.
If harness tests good but coil resistance out of spec, replace the outlet valve assembly.
After repairs, clear codes, perform ABS automated tests if available, and road-test to confirm no reoccurrence.
If wiring and valve check OK but the module shows internal short, consult OEM procedures for ABS module bench repair or replacement.