B2123 RAM Code - Ignition Run Control Circuit High
Quick Answer
The Front Control Module monitors the Ignition Run Control Circuit. Common causes include Faulty Run Relay, Run Relay harness is open or shorted, Run Relay 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
- B2123 RAM indicates Ignition Run Control Circuit High.
- Common causes
- Common causes include Faulty Run Relay, Run Relay harness is open or shorted, Run Relay 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 B2123 RAM Description
What are the Possible Causes of the DTC B2123 RAM?
- Faulty Run Relay
- Run Relay harness is open or shorted
- Run Relay circuit poor electrical connection
- Faulty Front Control Module (FCM)
How to Fix the DTC B2123 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 B2123 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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Frequently Asked Questions about B2123 RAM Code
1. What does the OBDII code B2123 mean for a RAM vehicle?
Code B2123 indicates a high voltage issue in the Ignition Run Control Circuit, which is responsible for providing power to essential systems when the ignition is in the "Run" position.
2. What are the common symptoms of the B2123 code in a RAM?
Symptoms may include the engine failing to start, dashboard warning lights not illuminating properly, or intermittent power loss to certain systems.
3. What causes the B2123 code to appear on a RAM?
Possible causes include a faulty ignition switch, damaged wiring or connectors in the ignition circuit, or a malfunctioning control module.
4. How can I diagnose the B2123 Ignition Run Control Circuit High code?
Start by visually inspecting the ignition circuit wiring and connectors for damage or corrosion, then use a multimeter to check for abnormal voltage levels in the circuit.
5. Can a dead battery trigger the B2123 code on a RAM vehicle?
While a dead battery itself may not trigger the code, low or unstable voltage during startup could cause related electrical issues that may contribute to the code.
6. What should I check first when troubleshooting the B2123 code?
Inspect the ignition switch for wear or damage, as it's a common culprit for issues in the ignition run control circuit.
7. Is the B2123 code serious enough to prevent driving?
Yes, this code can cause significant issues with starting the engine or maintaining power to essential systems, making the vehicle unreliable or unsafe to drive.
8. How do you fix the B2123 code on a RAM?
Repairs may include replacing a faulty ignition switch, repairing or replacing damaged wiring, or reprogramming/repairing the control module if necessary.
9. Can a software update fix the B2123 code in a RAM?
In rare cases, a software update might resolve the issue if the problem stems from control module programming errors. Consult your dealership for guidance.
10. How much does it typically cost to repair the B2123 code in a RAM?
Repair costs vary, but replacing an ignition switch typically costs $100–$300, while wiring repairs or control module replacements can increase the overall expense.
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