B1600 GMC Code - Mirror Motor Vertical 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
- B1600 GMC indicates Mirror Motor Vertical 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 B1600 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 B1600 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 B1600 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
B1600 02 Mirror Motor Vertical Circuit Short to Ground
B1600 04 Mirror Motor Vertical Circuit Open
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1600 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.
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Frequently Asked Questions about B1600 GMC Code
1. What are common symptoms of OBDII code B1600 GMC (Mirror Motor Vertical Circuit)?
- Common symptoms include non-functioning power mirrors, mirrors stuck in one position, or erratic mirror movement.
2. What causes the OBDII code B1600 GMC to trigger?
- The B1600 code is typically triggered by a malfunction in the mirror motor vertical circuit, such as a faulty motor, wiring issue, or a defective mirror switch.
3. How can I diagnose the issue causing OBDII code B1600 GMC?
- Diagnosis involves checking the mirror motor, wiring connections, and mirror switch for proper functionality. Using a multimeter to test for continuity and voltage can help pinpoint the problem.
4. What are some repair tips for fixing OBDII code B1600 GMC?
- Repair tips include replacing the faulty mirror motor, repairing or replacing damaged wiring, and ensuring proper connection of the mirror switch.
5. Can I fix the OBDII code B1600 GMC issue myself?
- Depending on your level of automotive repair experience, you may be able to fix the issue yourself by following diagnostic steps and repair procedures outlined in the vehicle's service manual.
6. Are there any safety precautions to consider when working on the mirror motor vertical circuit?
- It is important to disconnect the vehicle's battery before working on the mirror motor circuit to prevent electrical shock or damage to the vehicle's electrical system.
7. Will ignoring OBDII code B1600 GMC cause any further damage to my vehicle?
- Ignoring the B1600 code may result in continued mirror malfunction, affecting visibility and safety while driving. It is recommended to address the issue promptly.
8. Can extreme weather conditions affect the mirror motor vertical circuit and trigger OBDII code B1600 GMC?
- Yes, extreme temperatures or moisture can potentially damage the mirror motor circuit components, leading to the triggering of the B1600 trouble code.
9. How long does it typically take to repair OBDII code B1600 GMC?
- The repair time can vary depending on the exact cause of the issue and the availability of replacement parts. In general, repairing the mirror motor vertical circuit can take anywhere from 1 to 3 hours.
10. Is it necessary to reset the OBDII system after fixing code B1600 GMC?
- Yes, it is recommended to clear the OBDII trouble codes using a scan tool after repairing the mirror motor circuit to ensure the issue has been resolved and the code does not reappear.
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