B1106
BodyShift Lock Circuit Failure
On Subaru models specifically, this code means the shift-lock circuit has a fault. The shift lock is the safety system that prevents you from moving the gear selector out of Park unless the brake pedal is pressed.
ⓘ Information only. This page provides general educational information about fault code B1106. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.
Recommended next steps
Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.
What does B1106 mean?
B1106 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Shift Lock Circuit Failure.
Symptoms commonly associated with this code
Symptoms that drivers often report alongside this code. Not all may apply to every case:
- • Cannot shift out of Park, the gear selector is locked in place
- • Manual override (using the small slot/button next to the selector) is needed to move the car
- • Brake light on the dashboard, sometimes accompanied by other warnings
- • On some models, the engine starter may also be disabled
Possible causes
Causes commonly associated with B1106, listed in approximate order of typical investigation. The actual cause on a specific vehicle can only be confirmed by professional diagnosis.
- 1. Failed brake light switch, the most common cause. The shift-lock system uses the same input to know when the brake is pressed
- 2. Failed shift-lock solenoid in the gear selector
- 3. Wiring damage, the loom around the steering column area takes a battering over years
- 4. Damaged or corroded connector at the shift assembly
- 5. On older Subarus: faulty BCM (body control module) in rare cases
How mechanics typically diagnose
A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training.
- 1. Test the brake light switch, do the brake lights work normally? If not, that's the most likely cause and a £10-£25 part
- 2. Inspect the wiring around the brake pedal switch and the shift selector
- 3. Check the shift-lock solenoid resistance against spec (typically a few tens of ohms)
- 4. Use the manual shift-lock override (small slot near the selector, push down with a key) to confirm the car can be moved while diagnosing
Common questions about B1106
How do I get the car moving in the meantime? +
On every Subaru with this fault there's a manual shift-lock override, a small slot or button near the gear selector. Press the brake, push down on the override, and the lever frees up. Read the manual for the exact location on your model. It's a perfectly safe way to drive while waiting for repair.
Is the brake light switch connected? +
Yes, very directly. Many Subarus use the same brake pedal switch for both the brake lights and the shift-lock release. If your brake lights aren't working, that's almost certainly your B1106. Test the brake lights as your first diagnostic move, it costs nothing.
Manufacturer-specific notes
Some manufacturers publish additional definitions or variations for this code. Always cross-check with your vehicle's own service documentation.
Information only, not professional advice
The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →