B2108
Low Severity (Level 1)Trunk Key Cylinder Switch Failure
B2108 usually means trunk Key Cylinder Switch Failure.
Can you still drive with B2108?
✅Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.
Typical repair cost: $50 – $400
Severity Level 1 — Low
This code indicates a minor issue that is unlikely to cause immediate driveability problems. You can typically continue driving but should have the vehicle inspected at your earliest convenience.
Common Symptoms
- Hood/trunk not functioning as expected
- Warning light or message on dashboard related to the hood/trunk/liftgate system
- Diagnostic trouble code (DTC) stored in module memory
- Fault may be intermittent — code may clear itself and reappear
- Reduced vehicle functionality related to the hood/trunk/liftgate system
Possible Causes
- Failed latch actuator — internal fault from age, heat cycling, and vibration
- Damaged wiring or corroded connector in the hood/trunk/liftgate system circuit
- Blown fuse for the hood/trunk/liftgate system circuit — check before replacing components
- Faulty control module driving the latch actuator
- Loose or corroded ground point shared by the hood/trunk/liftgate system
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($48-114 at shop, free at auto parts store for basic scan)
- Visually inspect the hood/trunk/liftgate system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $70 diagnostic fee at shop)
- Replace latch actuator if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($50-400)
- Check and replace any blown fuses in the hood/trunk/liftgate system fuse circuit — if fuse blows again, there's still a short that needs to be found ($1-13 for fuses)
- Perform a wiggle test on the hood/trunk/liftgate system wiring harness while monitoring live data — see if the fault returns when you move the harness at different points ($0-103 diagnostic labor)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does B2108 mean?
B2108 stands for "Trunk Key Cylinder Switch Failure". B2108 usually means trunk Key Cylinder Switch Failure.
Can you drive with B2108?
Safe to drive — this is an informational or minor issue. Schedule diagnosis at your convenience.
How much does it cost to fix B2108?
Repair costs for B2108 typically range from $50 to $400, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($48-114 at shop, free at auto parts store for basic scan); Visually inspect the hood/trunk/liftgate system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $70 diagnostic fee at shop); Replace latch actuator if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($50-400).
Will B2108 clear itself?
Explore Repair Costs
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