What Does C1745 Mean?
The front parking sounder (audible warning buzzer) circuit is shorted to battery voltage. The sounder's control wire is contacting a 12V source, causing the front sounder to either buzz continuously or not function at all. The parking assist module detects the abnormal voltage condition and flags this fault. Forward parking proximity warnings will be unreliable or absent.
Common Causes
35%
Wiring harness damage with the front sounder control wire contacting a 12V power source
25%
Failed front sounder unit with internal short to power
20%
Corroded or water-damaged connector at the front sounder
15%
Pinched or chafed wiring behind the front bumper or dashboard area
5%
Parking assist module output driver fault
Diagnostic Steps
1
Disconnect the front sounder connector and measure voltage on the control wire from the module side — with the system not commanding the sounder, there should be 0V. Battery voltage confirms a harness short to Vbat.
2
Locate the front sounder (typically behind the front bumper trim panel or behind the dashboard) and inspect its connector for moisture, corrosion, or physical damage.
3
Measure the sounder coil/element resistance and check for any short between its terminals and a power supply — compare to manufacturer specification.
4
Trace the wiring from the front sounder back to the parking assist module, checking routing behind the bumper fascia, through the fender well, and into the cabin for chafing or pinch points.
5
If the sounder is buzzing continuously, temporarily disconnect it and verify the fault clears. Then focus on why the control wire is seeing battery voltage — either a harness short or the module is commanding it inappropriately.
Estimated Repair Cost
$40 - $250
Parts + labor, varies by vehicle and location
The front parking sounder (audible warning buzzer) circuit is shorted to battery voltage. The sounder's control wire is contacting a 12V source, causing the front sounder to either buzz continuously or not function at all. The parking assist module detects the abnormal voltage condition and flags th...
The most common cause of C1745 (Front Sounder Circuit Short to Vbatt) is: Wiring harness damage with the front sounder control wire contacting a 12V power source
Typical repair costs for C1745 range from $40 to $250, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive. Forward parking proximity audio warnings may not function or may sound continuously. If the sounder is buzzing nonstop, it is more of an annoyance than a safety issue. Use visual parking displays, cameras, and mirrors for close-quarters maneuvering until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1745 to identify the root cause.
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Quick Info
Category
Chassis
System
Parking Assist System
Difficulty
Type
Manufacturer
Recommended Tools
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