B2122 Chrysler Code - Ignition Run Control Circuit Low
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
- B2122 Chrysler indicates Ignition Run Control Circuit Low.
- 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 B2122 Chrysler Description
What are the Possible Causes of the DTC B2122 Chrysler?
- 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 B2122 Chrysler?
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 B2122 Chrysler 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 B2122 Chrysler Code
1. What are the common symptoms of OBDII code B2122 Chrysler (Ignition Run Control Circuit Low)?
- Common symptoms include difficulty starting the vehicle, engine misfiring, and the engine stalling while driving.
2. What can cause the ignition run control circuit to be low in a Chrysler vehicle?
- The most common causes of this issue are faulty ignition coil, damaged wiring or connectors in the ignition system, or a problem with the powertrain control module (PCM).
3. How can I diagnose the source of OBDII code B2122 in my Chrysler?
- A thorough inspection of the ignition system components, such as the ignition coil, spark plugs, and wiring, along with a scan tool to check for specific fault codes, can help pinpoint the issue.
4. Can driving with OBDII code B2122 cause further damage to my Chrysler vehicle?
- Continuing to drive with this code may lead to poor engine performance, reduced fuel efficiency, and potential damage to other engine components over time.
5. Is it safe to continue driving my Chrysler if I encounter OBDII code B2122?
- It is not recommended to drive the vehicle with this code present, as it can lead to unpredictable engine behavior and potential safety hazards on the road.
6. How can I repair OBDII code B2122 in my Chrysler?
- Repair options include replacing the faulty ignition coil, repairing damaged wiring or connectors, or reprogramming the PCM if necessary.
7. Can I reset the OBDII code B2122 in my Chrysler without fixing the underlying issue?
- Resetting the code without addressing the root cause will only temporarily clear the error code, and the issue is likely to reappear until the underlying problem is fixed.
8. Will a mechanic be able to easily diagnose and fix OBDII code B2122 in my Chrysler?
- A qualified mechanic with experience in diagnosing and repairing ignition system issues should be able to efficiently identify and resolve the problem.
9. How much can I expect to pay for repairs related to OBDII code B2122 in my Chrysler?
- The cost of repairs can vary depending on the specific cause of the issue, but it is advisable to budget for potential expenses related to replacing parts or repairing wiring.
10. Can regular maintenance help prevent OBDII code B2122 from occurring in my Chrysler?
- Regular maintenance, such as inspecting and replacing ignition system components as needed, can help prevent issues like OBDII code B2122 from occurring in your Chrysler.
Discuss the causes and fixes for B2122 Chrysler OBDII Code
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Thanks for the question. On a 2010 Chrysler 300, the B2122 code means there's a problem with the Ignition Run Control circuit—specifically, the voltage is lower than expected when the ignition is in the RUN position.
Here’s what you should check:
- Ignition switch: It might be worn or not sending proper voltage to the run circuit. Common issue on these cars as they age.
- Wiring and connectors: Check for any loose, damaged, or corroded wires between the ignition switch and the body control module (BCM).
- Fuses and relays: Make sure the ignition-related fuses aren’t blown and the relays are functioning correctly.
- Battery and grounds: A weak battery or bad ground can also trigger low voltage codes like this, especially on start-up.
This code can cause no-start or intermittent power issues, so I’d start by testing voltage at the ignition output when the key is in RUN. If it’s low or missing, that’ll confirm the direction to go.
Let me know if you’ve had other symptoms like no-crank or accessories not working.
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My fuse box in the trunk at some time was wet it has corrosion and a powdery white chalky dust in on and around it completely, and the grounds in the trunk show corrosion and rust at contact points.
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Thanks for the added details. Water damage and corrosion around the fuse box and grounds in the trunk can definitely cause the B2122 code and other electrical problems.
Here’s what you should do:
- Fix the grounds first: Remove the ground bolts in the trunk, clean all the rust and corrosion down to bare metal, and reinstall them tightly. Bad grounds can cause low voltage issues in multiple circuits, including the ignition run circuit.
- Inspect the fuse box carefully: If the fuse box is heavily corroded or has white chalky buildup, it could have internal damage. You can try cleaning it with electrical contact cleaner if the damage isn’t too deep, but if any terminals are badly corroded or brittle, the fuse box may need replacement.
- Check all connectors: Unplug the connectors from the fuse box and inspect the pins for corrosion. A bad connection here can easily cause voltage drops and communication problems.
- Check for active water leaks: Before putting it all back together, find and seal any water entry points (like bad trunk seals, tail light gaskets, or clogged sunroof drains if equipped) so it doesn't happen again.
Most likely, cleaning up the grounds and fixing the fuse box issue will take care of the B2122 code. If the damage is bad enough, replacing the fuse box might be the safer long-term fix.
Let me know if you want help identifying where the grounds and fuse box connectors are exactly on your model.
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