AutoCodes – Generic – B2100

B2100 Code - Door Driver Key Cylinder Switch Failure

Quick Answer

The Body Control Module (BCM) monitors the Door Driver Key Cylinder Switch. Common causes include Faulty Door Driver Key Cylinder Switch, Door Driver Key Cylinder Switch harness is open or shorted, Door Driver Key Cylinder Switch 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: B2100 indicates Door Driver Key Cylinder Switch Failure.
Common causes: Common causes include Faulty Door Driver Key Cylinder Switch, Door Driver Key Cylinder Switch harness is open or shorted, Door Driver Key Cylinder Switch 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.

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Code Popularity 9,041

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2100 Description

The Body Control Module (BCM) monitors the Door Driver Key Cylinder Switch. The BCM sets the OBDII code when the Door Driver Key Cylinder Switch is not to factory specifications.

OBDII Code B2100 - Door Driver Key Cylinder Switch Failure - AutoCodes.com — B2100 Code - Door Driver Key Cylinder Switch Failure

What does this mean?

What are the Possible Causes of the DTC B2100?

Faulty Door Driver Key Cylinder Switch
Door Driver Key Cylinder Switch harness is open or shorted
Door Driver Key Cylinder Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2100?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2100 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 B2100 code?

Need more information on how to fix the B2100 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2100 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2100 Chrysler — Ignition Run/Start Input Circuit Performance
B2100 Dodge — Ignition Run/Start Input Circuit Performance
B2100 Jeep — Ignition Run/Start Input Circuit Performance
B2100 RAM — Ignition Run/Start Input Circuit Performance

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B2100 Code

1. What are the common symptoms of OBDII code B2100 (Door Driver Key Cylinder Switch Failure)?

- The common symptoms include issues with unlocking the driver-side door with the key, difficulty turning the key in the door lock, or the key not turning at all.

2. What are the possible causes of OBDII code B2100?

- The code B2100 can be caused by a faulty driver key cylinder switch, damaged wiring related to the switch, or a problem with the lock mechanism itself.

3. How can I diagnose the issue related to OBDII code B2100?

- You can start by inspecting the key cylinder switch for any visible damage or signs of wear. Testing the switch's electrical connections and checking the wiring for continuity can help pinpoint the issue.

4. Can I still use my car if OBDII code B2100 is triggered?

- While the code B2100 may not affect the drivability of your car, it is important to address the issue promptly to ensure proper functioning of the driver-side door lock.

5. Is it possible to repair OBDII code B2100 on my own?

- Depending on your automotive repair skills, you may be able to replace the driver key cylinder switch yourself. However, it is recommended to consult a professional mechanic for an accurate diagnosis and repair.

6. Are there any temporary solutions for OBDII code B2100?

- If you are unable to immediately address the issue, using the remote keyless entry system or accessing the vehicle through another door can serve as temporary solutions until the problem is fixed.

7. How much does it typically cost to repair OBDII code B2100?

- The cost of repairing OBDII code B2100 can vary depending on the extent of the damage and whether you choose to replace the switch yourself or have it done by a mechanic. It is recommended to obtain quotes from different repair shops.

8. Can OBDII code B2100 affect the security of my vehicle?

- While the code B2100 is related to the driver-side door lock, it is important to address the issue promptly to ensure the security of your vehicle is not compromised.

9. Will resetting the OBDII system clear the B2100 code?

- Resetting the OBDII system may temporarily clear the B2100 code, but if the underlying issue with the driver key cylinder switch is not addressed, the code is likely to reappear.

10. How long does it typically take to repair OBDII code B2100?

- The repair time for OBDII code B2100 can vary depending on the complexity of the issue and the availability of parts. It is advisable to consult with a professional mechanic to get an estimate of the repair timeline.