AutoCodes – RAM – B2108 RAM

B2108 RAM Code - Ignition Switch Sense Input Circuit Low

Quick Answer

The Instrument Cluster monitors Ignition Switch Sense 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: B2108 RAM indicates Ignition Switch Sense Input Circuit Low.
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 664

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 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2108 RAM Description

The Instrument Cluster monitors Ignition Switch Sense Input Circuit. The Instrument Cluster sets the OBDII code when the Ignition Switch Sense circuit voltage less than 0.3 volts.

OBDII Code B2108 RAM - Ignition Switch Sense Input Circuit Low - AutoCodes.com — B2108 RAM Code - Ignition Switch Sense Input Circuit Low

What does this mean?

What are the Possible Causes of the DTC B2108 RAM?

Faulty Ignition Switch
Ignition Switch harness is open or shorted
Ignition Switch circuit poor electrical connection
Faulty Instrument Cluster

How to Fix the DTC B2108 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 B2108 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.

Need more information about the B2108 RAM code?

Need more information on how to fix the B2108 RAM code? Get Access to Factory Service Manuals

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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 B2108 RAM Code

1. What does the OBDII code B2108 RAM mean?

The code B2108 RAM indicates an issue with the Ignition Switch Sense Input Circuit, specifically that the circuit is reading a low voltage when it should not.

2. What are the common symptoms of the B2108 code?

Symptoms may include difficulty starting the vehicle, intermittent ignition issues, or the ignition switch not responding properly.

3. What causes the B2108 Ignition Switch Sense Input Circuit Low code?

Common causes include a faulty ignition switch, damaged or corroded wiring, a bad connection in the circuit, or a failed control module.

4. Can I drive my vehicle with the B2108 code?

Driving with this code is not recommended as it can lead to unpredictable ignition issues, including the vehicle failing to start or stalling unexpectedly.

5. How is the B2108 code diagnosed?

A technician will inspect the ignition switch, check for wiring damage, test the circuit for proper voltage, and ensure that the control module is functioning correctly.

6. How do I fix the B2108 Ignition Switch Sense Input Circuit Low issue?

Repairs may involve replacing the ignition switch, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming or replacing the control module.

7. What tools are needed to diagnose the B2108 code?

Tools include an OBDII scanner, a multimeter for testing voltage, and possibly wiring diagrams for the ignition circuit.

8. How much does it cost to repair the B2108 code?

Repair costs vary but can range from $100 to $500, depending on whether the issue is a simple wiring repair or requires ignition switch replacement.

9. Can a bad battery cause the B2108 code?

While uncommon, a weak or failing battery may contribute to low voltage in the ignition circuit, potentially triggering the B2108 code.

10. Is the B2108 code specific to RAM vehicles?

While the code is common on RAM vehicles, other manufacturers may use the same code definition for similar ignition circuit issues. Always check your vehicle's specific diagnostic information.