C1181

Code

Other C — Chassis

Park Brake Valve Solenoid #1 Sense Input Circuit Short to Gound

Brand: Other

Type: C — Chassis

Views: UK: 23 EN: 35 RU: 73

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Page language: EN

Causes

Damaged/chafed wiring contacting chassis ground
Corroded or pushed-out connector terminal
Water intrusion into connector or harness
Failed park brake valve solenoid with internal short
Faulty control module (internal driver short)
Improper aftermarket wiring or recent repair damage

Symptoms

Parking/emergency brake won’t apply or release properly
Brake warning lamp or parking brake indicator illuminated
Related chassis/ABS warnings or degraded brake control
DTC stored and possible limp or inhibited functions
No audible/visible actuation from solenoid when commanded

What to check

Retrieve freeze frame and stored DTC details with scan tool
Visual inspection of park brake valve solenoid #1 connector and wiring for damage, corrosion, or water
Disconnect solenoid connector and check for continuity between the sense pin and chassis ground
Measure solenoid coil resistance and compare to specification
Backprobe control/sense pin at connector while commanding solenoid with scan tool and observe voltage
Wiggle harness and connectors while monitoring the circuit for intermittent changes

Signal parameters

Normal (ignition on, no command): harness sense voltage typically near battery voltage (approx. 11–14 V) or pulled high by module
When commanded: voltage may be driven/grounded or modulated by the control module (varies by design)
Short-to-ground condition: measured voltage near 0 V at the sense pin or continuity to chassis ground
Typical solenoid coil resistance (varies by vehicle): generally low ohms (often 2–30 Ω); consult vehicle spec

Diagnostic algorithm

Record freeze-frame data and note conditions when code set. Clear code and attempt to re-create; observe whether it returns.
Perform a thorough visual inspection of the park brake valve solenoid #1 harness and connector for chafing, pin damage, corrosion, or water ingress.
With ignition off, disconnect the solenoid connector. Measure resistance between the solenoid sense/control pin and chassis ground. If there is continuity (low resistance), isolate and repair the short in wiring or connector.
Measure the solenoid coil resistance between its terminals. If coil shows internal short (very low resistance or open), replace the solenoid.
With connector disconnected, check continuity between the harness control pin and the control module pin. If the harness is open to the module without short, suspect module internal fault.
Reconnect and backprobe the control/sense circuit. With ignition on, command the solenoid using a scan tool and observe voltage. If the module output is always at ground (0 V) when it should change, the module driver may be faulty or a short to ground exists downstream.
If intermittent, perform a wiggle test along the harness while monitoring. Use a scope if available to capture transient shorts or PWM signals.
Repair or replace damaged wiring, clean/replace corroded connectors, replace the solenoid if confirmed faulty. If wiring checks good and module output remains shorted, consult manufacturer guidance for control module repair or replacement.
After repair, clear codes and road-test to confirm proper operation and that the DTC does not return.

Likely causes

Pinched or rubbed-through insulation where harness passes body/frame
Corroded connector terminal creating low resistance path to ground
Solenoid internal short or shorted coil
Short in wiring near connector or junction block
Control module driver transistor shorted to ground (less common)

Fault status

⚠️ Status

Park Brake Valve Solenoid #1 sense/input circuit short to ground — control module detects low-voltage/grounded input on solenoid sense line.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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