B2104 Dodge Code - Ignition Unlock Run/Start Control Circuit Low
Quick Answer
The Front Control Module monitors the Ignition Unlock Run/Start Control Circuit. Common causes include Faulty Shifter Lever Assembly, Shifter Lever Assembly harness is open or shorted, Shifter Lever Assembly 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
- B2104 Dodge indicates Ignition Unlock Run/Start Control Circuit Low.
- Common causes
- Common causes include Faulty Shifter Lever Assembly, Shifter Lever Assembly harness is open or shorted, Shifter Lever Assembly 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.
Code B2104 Dodge Description
What are the Possible Causes of the DTC B2104 Dodge?
- Faulty Shifter Lever Assembly
- Shifter Lever Assembly harness is open or shorted
- Shifter Lever Assembly circuit poor electrical connection
- Faulty Front Control Module (FCM)
How to Fix the DTC B2104 Dodge?
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 B2104 Dodge 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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Frequently Asked Questions about B2104 Dodge Code
1. What does the OBD-II code B2104 mean in a Dodge vehicle?
The B2104 code indicates a problem with the Ignition Unlock Run/Start Control Circuit, specifically a low voltage condition.
2. What are the common symptoms of the B2104 code in a Dodge?
Symptoms may include difficulty starting the vehicle, the ignition not unlocking, or electrical components failing to power up in the "Run" or "Start" position.
3. What causes the B2104 code to appear?
Common causes include a faulty ignition switch, damaged wiring or connectors in the circuit, or a malfunctioning Powertrain Control Module (PCM).
4. How can you diagnose the B2104 code?
Diagnosis involves checking the ignition switch, inspecting wiring and connectors for damage or corrosion, and using a multimeter to test circuit voltage.
5. Can a drained battery cause the B2104 code to trigger?
Yes, a low or drained battery can lead to insufficient voltage in the ignition circuit, potentially triggering the code.
6. How do you fix the B2104 code on a Dodge?
Repairs may include replacing the ignition switch, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.
7. Is it safe to drive with the B2104 code active?
Driving with this code may cause intermittent starting issues or other electrical problems, so it’s best to address it promptly.
8. Does clearing the B2104 code fix the problem permanently?
Clearing the code erases it temporarily, but the underlying issue must be repaired to prevent the code from returning.
9. Can a blown fuse cause the B2104 code?
Yes, a blown fuse in the ignition circuit can result in low voltage and trigger the code.
10. Is professional help required to resolve the B2104 code?
While some repairs, like replacing a blown fuse, can be done by a DIYer, complex issues like PCM faults or extensive wiring damage may require professional assistance.
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