B1605 GMC Code - Mirror Motor Horizontal Circuit
Quick Answer
The Driver Door Module (DDM) or Passenger Door Module (PDM) controls the mirror horizontal and vertical motors through the use of bi-directional motor controls. Common causes include Faulty Driver/Passenger Rearview Mirror Motor, Driver/Passenger Rearview Mirror Motor harness is open or shorted, Driver/Passenger Rearview Mirror Motor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B1605 GMC indicates Mirror Motor Horizontal Circuit.
- Common causes
- Common causes include Faulty Driver/Passenger Rearview Mirror Motor, Driver/Passenger Rearview Mirror Motor harness is open or shorted, Driver/Passenger Rearview Mirror Motor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B1605 GMC Description
Horizontal controls operate in the same manner with the mirror motor horizontal control circuit supplying voltage or ground and the mirror motor common control circuit supplying voltage or ground to the mirror horizontal motor when the mirror is commanded right and left.
What are the Possible Causes of the DTC B1605 GMC?
- Faulty Driver/Passenger Rearview Mirror Motor
- Driver/Passenger Rearview Mirror Motor harness is open or shorted
- Driver/Passenger Rearview Mirror Motor circuit poor electrical connection
- Faulty Driver Door Module (DDM) or Passenger Door Module (PDM)
How to Fix the DTC B1605 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
B1605 02 Mirror Motor Horizontal Circuit Short to Ground
B1605 04 Mirror Motor Horizontal Circuit Open
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1605 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the B1605 GMC code?
Need more information on how to fix the B1605 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1605 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B1605 GMC Code
1. What are the common symptoms of OBDII code B1605 GMC (Mirror Motor Horizontal Circuit)?
The common symptoms include the inability to adjust the mirror horizontally, erratic movement of the mirror, or complete mirror failure.
2. What are the possible causes of OBDII code B1605 GMC?
The code B1605 GMC can be caused by a faulty mirror motor, damaged wiring or connectors in the mirror circuit, or a malfunctioning mirror switch.
3. How can I diagnose the cause of OBDII code B1605 GMC?
You can diagnose the code by checking the wiring and connectors for damage, testing the mirror motor for proper function, and ensuring the mirror switch is working correctly.
4. What are some repair tips for fixing OBDII code B1605 GMC?
Repair tips include repairing or replacing damaged wiring and connectors, replacing the mirror motor if faulty, and testing the mirror switch for proper operation.
5. Can a DIY enthusiast fix OBDII code B1605 GMC at home?
Yes, some DIY enthusiasts may be able to fix the issue at home by following repair guides, using basic tools, and having some knowledge of automotive electrical systems.
6. Is it safe to continue driving with OBDII code B1605 GMC present?
It is generally safe to continue driving with this code, but it is recommended to address the issue promptly to ensure proper functionality of the mirror adjustment system.
7. Will resetting the OBDII code B1605 GMC make it go away permanently?
Resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to return.
8. How much does it typically cost to repair OBDII code B1605 GMC at a mechanic or dealership?
The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300, including parts and labor.
9. Are there any preventive measures to avoid OBDII code B1605 GMC in the future?
Regularly inspecting the mirror adjustment system, avoiding excessive force when adjusting the mirror, and addressing any issues promptly can help prevent the recurrence of this code.
10. Can OBDII code B1605 GMC affect other systems in the vehicle?
While this code specifically relates to the mirror motor horizontal circuit, it is always recommended to address any OBDII codes promptly as they can sometimes indicate broader issues within the vehicle's electrical system.
Discuss the causes and fixes for B1605 GMC OBDII Code
Code B1605 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
