What Does C1173 Mean?
The park brake switch #1 released circuit is shorted to ground, causing the ABS module to incorrectly read the parking brake as always released (or always applied, depending on logic). This prevents proper parking brake status reporting to the ABS/stability control system. The driver may see a parking brake warning light malfunction and the ABS system may operate in a degraded mode.
Common Causes
35%
Wiring harness chafed through to chassis ground near the park brake switch
30%
Park brake switch #1 internally shorted to ground
20%
Corroded or water-damaged connector allowing ground path
15%
Incorrect switch installation or aftermarket part with wrong resistance
Diagnostic Steps
1
Disconnect the park brake switch #1 connector and clear the code. If the code changes to an open circuit code (C1172), the switch itself is shorted internally — replace the switch.
2
With the switch disconnected, measure resistance from the switch signal wire at the ABS module connector to chassis ground. If near 0 ohms, the wiring harness has a short to ground — trace and repair.
3
Inspect the wiring harness routing from the switch to the ABS module for areas of chafing, especially where it passes near metal edges, bolts, or body panels.
4
Check the switch connector for moisture, corrosion, or green deposits on the pins that could create a low-resistance path to ground.
5
If wiring and switch test good, monitor the circuit with a scan tool live data PID while manipulating the harness to identify an intermittent short.
Estimated Repair Cost
$50 - $300
Parts + labor, varies by vehicle and location
The park brake switch #1 released circuit is shorted to ground, causing the ABS module to incorrectly read the parking brake as always released (or always applied, depending on logic). This prevents proper parking brake status reporting to the ABS/stability control system. The driver may see a parki...
The most common cause of C1173 (Park Brake Switch # 1 Released Circuit Short to Gnd) is: Wiring harness chafed through to chassis ground near the park brake switch
Typical repair costs for C1173 range from $50 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The parking brake mechanical function is likely unaffected, but the electronic systems cannot verify its state. ABS and stability control may be degraded. Safe to drive to a repair facility at moderate speeds, but do not rely on electronic stability features until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1173 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Parking Brake System
Difficulty
Type
Manufacturer
Recommended Tools
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