B1921 Jaguar Code - RCM Bracket Ground Resistance High
Quick Answer
The Restraint Control Module (RCM) monitors resistance between ground connections at its housing and reference ground at RCM connector. Common causes include Faulty Restraint Control Module (RCM), Restraint Control Module (RCM) harness is open or shorted, Restraint Control Module (RCM) 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
- B1921 Jaguar indicates RCM Bracket Ground Resistance High.
- Common causes
- Common causes include Faulty Restraint Control Module (RCM), Restraint Control Module (RCM) harness is open or shorted, Restraint Control Module (RCM) 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 B1921 Jaguar Description
What are the Possible Causes of the DTC B1921 Jaguar?
- Faulty Restraint Control Module (RCM)
- Restraint Control Module (RCM) harness is open or shorted
- Restraint Control Module (RCM) circuit poor electrical connection
How to Fix the DTC B1921 Jaguar?
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 B1921 Jaguar 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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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service
- Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
- Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
- Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
- Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
Frequently Asked Questions about B1921 Jaguar Code
1. What are the common symptoms of OBDII code B1921 Jaguar (RCM Bracket Ground Resistance High)?
The common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the airbag system's functionality.
2. What causes the OBDII code B1921 Jaguar (RCM Bracket Ground Resistance High)?
This code is typically caused by a high resistance in the Restraints Control Module (RCM) bracket ground circuit, which can be due to poor connection or corrosion.
3. How can I diagnose the OBDII code B1921 Jaguar (RCM Bracket Ground Resistance High)?
Diagnosing this code involves inspecting the RCM bracket ground connections for corrosion, checking the wiring for any damage, and testing the ground circuit for proper continuity.
4. Can I drive my Jaguar with the OBDII code B1921 (RCM Bracket Ground Resistance High)?
It is not recommended to drive your Jaguar with this code present, as it indicates a potential issue with the airbag system that could affect its functionality in the event of an accident.
5. How do I repair the OBDII code B1921 Jaguar (RCM Bracket Ground Resistance High)?
To repair this code, you may need to clean the RCM bracket ground connections, repair any damaged wiring, and ensure proper grounding to resolve the high resistance issue.
6. Is the OBDII code B1921 Jaguar (RCM Bracket Ground Resistance High) a serious issue?
Yes, this code should be addressed promptly as it indicates a fault in the airbag system's ground circuit, which could compromise the airbag's deployment in the event of a collision.
7. Can resetting the OBDII code B1921 Jaguar (RCM Bracket Ground Resistance High) make it go away permanently?
Simply resetting the code may temporarily clear the warning light, but if the underlying issue with the RCM bracket ground resistance is not addressed, the code is likely to reappear.
8. How much does it typically cost to repair the OBDII code B1921 Jaguar (RCM Bracket Ground Resistance High)?
The cost of repairing this code can vary depending on the extent of the issue and whether any components need to be replaced, but it may range from a DIY repair to a few hundred dollars at a repair shop.
9. Can I fix the OBDII code B1921 Jaguar (RCM Bracket Ground Resistance High) myself?
If you have the necessary tools and skills, you may be able to fix this code yourself by inspecting the RCM bracket ground connections, cleaning or repairing them, and ensuring proper grounding.
10. How often does the OBDII code B1921 Jaguar (RCM Bracket Ground Resistance High) occur in Jaguar vehicles?
While the occurrence of this specific code may vary, issues related to high resistance in the RCM ground circuit can be relatively common in Jaguar vehicles, especially as they age.
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