C1173 — Park Brake Switch #1 Released Circuit Short to Gnd #

Note: The code label may vary depending on the vehicle manufacturer (OEM). Always refer to your vehicle’s service information for the most accurate terminology.

• Park Brake Switch #1 Released Circuit Short to Ground (Generic, Nissan, Infiniti)
• Electric Parking Brake Switch Circuit Shorted to Ground (Ford, Lincoln)
• Parking Brake Switch 1 Circuit Low (Hyundai, Kia)

Code Summary for C1173 #

The C1173 diagnostic trouble code (DTC) indicates that the powertrain control module (PCM) or body control module (BCM) has detected an electrical short to ground in the Park Brake Switch #1 Released Circuit. The park brake switch is a sensor that monitors the position of the parking brake (whether it is engaged or released) and sends this information to the vehicle’s computers. A “short to ground” means that the circuit is unintentionally making contact with the vehicle’s chassis or negative battery terminal, causing incorrect readings. This code is most commonly logged in vehicles with electronic or sensor-monitored parking brakes. Addressing this issue promptly is important to ensure correct function of the parking brake system and to maintain overall vehicle safety.

Frequent Symptoms for Code C1173 #

When the C1173 code is present, the vehicle’s computer may restrict or alter the operation of the parking brake system. The following symptoms are commonly reported:

• Parking brake warning light illuminated on the dashboard
• Intermittent or continuous chime or warning message (“Check Parking Brake System”)
• Parking brake may not release or engage properly
• Possible ABS (Anti-lock Braking System) or traction control warning lights
• Parking brake indicator does not match the actual brake lever/pedal position

Probable Causes for Code C1173 #

The root causes of a C1173 fault usually relate to electrical faults in the park brake switch circuit. The following causes are listed in order of likelihood:

1. Damaged or shorted wiring in the parking brake switch circuit
2. Faulty park brake switch (mechanical or electronic failure)
3. Corroded or loose electrical connectors at the switch or module
4. Faulty or contaminated ground connection near the park brake assembly
5. Malfunctioning body control module (BCM) or PCM (rare)

Step-by-Step Diagnosis for C1173 #

A systematic diagnostic approach will help you pinpoint the cause of the C1173 code efficiently. Here’s a proven step-by-step process:

1. Retrieve all stored codes and freeze frame data using a scan tool. Clear codes and see if C1173 returns.
2. Visually inspect the parking brake switch and related wiring for damage, pinching, or exposed wires.
3. Check the connectors at the park brake switch and BCM/PCM for corrosion, bent pins, or poor fit.
4. Test the circuit for continuity and shorts to ground using a digital multimeter. Refer to OEM wiring diagrams.
5. Manually operate the parking brake switch and monitor its output voltage or resistance. Compare readings with OEM specifications.
6. Check ground integrity at the parking brake assembly’s ground point (clean and retighten if needed).
7. If all wiring and switch tests are normal, suspect a BCM or PCM fault and follow OEM troubleshooting steps.

Possible Repairs for Code C1173 #

Repairs for C1173 should address the identified root cause. Here are the most common fixes, each linked to the corresponding cause:

• Repair or replace damaged wiring (splices, insulation, connectors)
• Replace a faulty park brake switch (ensure correct part for your VIN)
• Clean and secure all relevant connectors (apply dielectric grease if recommended)
• Restore or clean ground connections (remove rust, retighten bolts)
• Replace or reprogram BCM/PCM only if all other steps fail and the module is confirmed faulty

Is It Safe to Drive with Code C1173? #

Driving with a C1173 code is generally not recommended. While the vehicle may seem to operate normally, the park brake system may not engage or release as intended. This can increase the risk of rollaway or parking accidents, especially on inclines. In some cases, the vehicle may also restrict certain functions (like auto-hold or hill-start assist) for safety reasons. Have the issue diagnosed and repaired as soon as possible before regular driving.

Vehicles Most Commonly Affected by C1173 #

This code appears most frequently in vehicles that use electronically monitored parking brake systems or advanced driver assistance systems (ADAS). Models commonly affected include:

• Nissan Altima, Maxima, Rogue, Murano
• Infiniti Q50, QX60, QX80
• Ford Explorer, Edge, F-150 (with electric park brake)
• Hyundai Santa Fe, Tucson, Sonata
• Kia Sorento, Optima

Common Mistakes & Best Practices for C1173 #

Misdiagnosis and quick fixes can lead to repeated failures or safety risks. Avoid these pitfalls:

• Replacing the park brake switch without checking wiring first
• Overlooking hidden wiring damage under carpets or trim panels
• Ignoring the importance of clean, tight ground connections
• Not using OEM wiring diagrams when testing circuits
• Failing to clear codes and retest after repairs

Quick FAQ for C1173 #

Q: Can I reset the C1173 code myself with a scan tool?
A: You can clear the code, but if the underlying fault remains, the code will return quickly. Always diagnose and fix the cause before clearing codes.

Q: Does C1173 mean my parking brake is unsafe?
A: The code indicates a potential fault that may affect the reliability of your parking brake. Until the issue is fixed, rely on extra caution when parking, especially on slopes.