AutoCodes – RAM – B212C RAM

B212C RAM 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 RAM 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 1,183

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

What does this mean?

What are the Possible Causes of the DTC B212C RAM?

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 RAM?

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 RAM 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.

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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 RAM Code

1. What does OBDII code B212C in a RAM vehicle mean?

Code B212C indicates an open circuit in the Ignition Run/Start Input, which affects the vehicle's ability to detect proper ignition switch signals.

2. What are the common symptoms of code B212C in a RAM vehicle?

Symptoms may include difficulty starting the vehicle, intermittent or no response from the ignition, and possible warning lights on the dashboard.

3. What causes the B212C code to appear in a RAM vehicle?

Common causes include a faulty ignition switch, damaged wiring or connectors in the ignition circuit, or issues with the Powertrain Control Module (PCM).

4. Can a faulty ignition switch trigger code B212C?

Yes, a malfunctioning ignition switch can prevent the proper signals from being sent, leading to the B212C code.

5. How can I diagnose code B212C in my RAM vehicle?

Use an OBDII scanner to confirm the code, check the ignition circuit wiring and connectors for damage, and test the ignition switch for proper operation.

6. Is code B212C related to the vehicle not starting?

Yes, this code can result in the vehicle failing to start due to the ignition circuit not completing properly.

7. How do I fix code B212C in a RAM vehicle?

Repairs may involve replacing the ignition switch, repairing or replacing damaged wiring, or addressing connector issues in the ignition circuit.

8. Can a dead battery cause the B212C code?

While a dead battery can cause ignition-related issues, the B212C code is specifically related to an open circuit in the ignition run/start input.

9. Is it safe to drive with code B212C in my RAM vehicle?

Driving may be unsafe if the ignition circuit is unreliable, as it could lead to unexpected stalling or failure to start the vehicle.

10. Do I need a professional mechanic to repair code B212C?

While some basic checks can be done at home, professional diagnosis and repair are recommended for complex electrical issues related to the ignition system.