B2568: Reverse Mirror Output Short to Ground
Diagnostic trouble code B2568 indicates a short to ground in the reverse mirror output circuit. This system, primarily found in Ford vehicles, controls the automatic tilt-down of the passenger-side mirror when reverse gear is selected. The control module detects that the output signal to the mirror motor is grounded, preventing proper tilt function or causing erratic mirror behavior.
1. Commonly Affected Makes
2. Most Common Causes
- Wiring in the mirror output circuit shorted to ground
- Passenger mirror motor with internal short circuit
- Corroded or damaged mirror connector contacting chassis ground
- Damaged mirror control module (GEM/FEM) with internal output failure
- Door harness with deteriorated insulation in the hinge area
3. Symptoms You Will Notice
- Passenger mirror does not tilt down when reverse is engaged
- Mirror moves erratically or intermittently
- Mirror stuck in one position
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to the vehicle
Visually inspect the mirror wiring and connector for damage or corrosion
Test the mirror motor circuit for continuity to ground using a multimeter
If wiring is intact, test the mirror motor by applying power and ground directly
If motor and wiring are good, suspect a faulty GEM/FEM module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The fault only affects the automatic mirror tilt function; the mirror can still be adjusted manually.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the issue is a simple wiring repair or requires replacing the mirror assembly or control module.