The Diagnostic Trouble Code (DTC) B1405:02 indicates a problem with your vehicle’s parking assist system. Specifically, it points to a short to ground in the control module’s voltage reference output 2 circuit. This article will delve into this DTC, explaining its causes, symptoms, diagnosis, and potential solutions.
What Does GM DTC B1405:02 Mean?
The parking assist system relies on sensors to detect objects around your vehicle. These sensors require a stable voltage supply to operate correctly. The control module provides this voltage through a dedicated reference circuit. When the DTC B1405:02 is set, it signifies that the control module has detected a short circuit in this 8V reference output 2, meaning the voltage has dropped significantly due to an unintended path to ground. This malfunction can disrupt the sensor’s ability to function and provide accurate distance measurements.
Symptoms of B1405:02
When this DTC is triggered, you may experience the following:
- Malfunctioning Parking Assist: The parking assist system may be disabled entirely or provide inaccurate readings.
- Warning Message: A “SERVICE PARK ASSIST” message may appear on the driver information center (DIC).
- Audible Alert Issues: The audible beeping that normally indicates proximity to objects may be erratic or absent.
Diagnosing GM DTC B1405:02
Diagnosing this issue involves a systematic approach:
- Use a Scan Tool: A professional-grade scan tool can retrieve the specific DTC and provide live data from the parking assist system. This data can help pinpoint the problem area.
- Visual Inspection: Inspect the wiring harness and connectors associated with the parking assist sensors for any visible damage, corrosion, or loose connections.
- Voltage Test: Using a multimeter, check the voltage at the sensor connectors. You should see a reading between 6.3V and 10.4V with the park assist activated. A significantly lower voltage indicates a short to ground.
- Sensor Isolation: Disconnect each sensor individually and recheck for the DTC. This can help identify a faulty sensor causing the short.
Common Causes and Solutions for B1405:02
Several factors can contribute to this DTC:
- Damaged Wiring: A frayed or broken wire in the reference circuit can create a short to ground. Solution: Repair or replace the damaged wiring section.
- Faulty Sensor: A malfunctioning sensor can internally short circuit, affecting the reference voltage. Solution: Replace the faulty sensor.
- Corroded Connector: Corrosion in the sensor connectors can disrupt the electrical connection and cause a short. Solution: Clean or replace the corroded connector.
- Control Module Issue: In rare cases, the parking assist control module itself may be faulty. Solution: Replace the control module and perform any necessary programming or setup.
Conclusion
The Gm Dtc B1405:02 indicates a short to ground in the parking assist system’s control module voltage reference output 2 circuit. This can lead to a malfunctioning or disabled parking assist system. By systematically diagnosing the issue and addressing the underlying cause, you can restore the system’s functionality and ensure safe parking maneuvers. Always consult a qualified technician for proper diagnosis and repair.
