AutoCodes – Generic – B212C

B212C Code - Ignition Run/Start Input Circuit Open

Quick Answer

The Occupant Classification Module (OCM) monitors the Ignition Run/Start Input Circuit. Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition 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: B212C indicates Ignition Run/Start Input Circuit Open.
Common causes: Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition 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 18,075

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 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B212C Description

The Occupant Classification Module (OCM) monitors the Ignition Run/Start Input Circuit. The OCM sets the OBDII codes if the voltage on the Fused Ignition Switch Output (Run-Start) circuit drops below 6.0 volts.

OBDII Code B212C - Ignition Run/Start Input Circuit Open - AutoCodes.com — B212C Code - Ignition Run/Start Input Circuit Open

What does this mean?

What are the Possible Causes of the DTC B212C?

Faulty Ignition Switch
Ignition Switch harness is open or shorted
Ignition Switch circuit poor electrical connection
Faulty Occupant Classification Module (OCM)
Faulty Occupant Restraint Controller (ORC)

How to Fix the DTC B212C?

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 B212C 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 B212C code?

Need more information on how to fix the B212C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B212C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B212C Chrysler — Ignition Run/Start Input Circuit Open
B212C Dodge — Ignition Run/Start Input Circuit Open
B212C Jeep — Ignition Run/Start Input Circuit Open
B212C RAM — Ignition Run/Start Input Circuit Open

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 B212C Code

1. What are the common symptoms of OBDII code B212C (Ignition Run/Start Input Circuit Open)?

- Common symptoms include difficulty starting the vehicle, engine stalling, and failure of the ignition system to engage.

2. What are the possible causes of OBDII code B212C?

- Possible causes include a faulty ignition switch, damaged wiring or connectors in the ignition circuit, or a defective ignition control module.

3. How can I diagnose the issue related to OBDII code B212C?

- Diagnose the issue by inspecting the ignition system wiring, checking the ignition switch for proper operation, and testing the ignition control module for faults using a digital multimeter.

4. Can a DIYer repair OBDII code B212C at home?

- DIY repair is possible depending on the root cause. Basic repairs like fixing loose wiring connections or replacing a faulty ignition switch can be done at home, but more complex issues may require professional help.

5. Is it safe to drive with OBDII code B212C present?

- It is not recommended to drive with this code present, as it can lead to potential issues like stalling while driving or the vehicle not starting at all.

6. How much does it typically cost to repair OBDII code B212C?

- Repair costs can vary depending on the exact cause of the issue. Simple fixes like replacing a faulty ignition switch may cost around $100-$200, while more complex repairs involving the ignition control module can run higher.

7. Can weather conditions affect the occurrence of OBDII code B212C?

- Yes, extreme weather conditions or moisture exposure can sometimes lead to electrical issues like the one indicated by this code. Ensure all electrical components are properly sealed and protected.

8. Will resetting the OBDII code B212C resolve the issue?

- Resetting the code may temporarily clear the error, but if the underlying issue is not fixed, the code is likely to reappear. It's important to diagnose and address the root cause of the problem.

9. Can a weak car battery cause OBDII code B212C to trigger?

- Yes, a weak car battery can sometimes cause issues with the ignition system, leading to the triggering of this code. Ensure your battery is in good condition and properly charged.

10. How long does it typically take to repair OBDII code B212C?

- The repair time can vary depending on the complexity of the issue and the availability of parts. Simple fixes may take an hour or two, while more involved repairs could require several hours or even a day.