B1921 Ford 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 Ford 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 Ford Description
What are the Possible Causes of the DTC B1921 Ford?
- 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 Ford?
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 Ford 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 Ford Code
1. What are the common symptoms of OBDII code B1921 Ford (RCM Bracket Ground Resistance High)?
- The common symptoms include airbag warning light illuminating on the dashboard, possible loss of airbag functionality, and potential diagnostic trouble codes related to the restraint control module.
2. What are the possible causes of OBDII code B1921 Ford (RCM Bracket Ground Resistance High)?
- The code can be triggered by a loose or corroded ground connection at the restraint control module bracket, damaged wiring harness, or a faulty restraint control module.
3. How can I diagnose OBDII code B1921 Ford (RCM Bracket Ground Resistance High)?
- Diagnosis involves inspecting the wiring harness and ground connections for any visible damage, performing continuity tests on the ground circuit, and using a scan tool to retrieve additional fault codes.
4. Can I drive my vehicle with OBDII code B1921 Ford (RCM Bracket Ground Resistance High)?
- It is not recommended to drive the vehicle with this code present, as it may indicate a potential issue with the airbag system, compromising passenger safety.
5. How do I repair OBDII code B1921 Ford (RCM Bracket Ground Resistance High)?
- Repair involves addressing any damaged wiring or ground connections, securing the restraint control module bracket properly, and clearing the fault codes with a scan tool.
6. Will disconnecting the battery reset OBDII code B1921 Ford (RCM Bracket Ground Resistance High)?
- Disconnecting the battery may temporarily clear the code, but it is important to address the underlying issue causing the fault code to prevent it from recurring.
7. Is OBDII code B1921 Ford (RCM Bracket Ground Resistance High) a serious issue?
- Yes, this code should be taken seriously as it indicates a potential problem with the airbag system, which is a critical safety component of the vehicle.
8. How much does it typically cost to repair OBDII code B1921 Ford (RCM Bracket Ground Resistance High)?
- The cost of repair can vary depending on the exact cause of the issue, but it may involve simple fixes like resecuring ground connections or more complex repairs involving module replacement.
9. Can I clear OBDII code B1921 Ford (RCM Bracket Ground Resistance High) with a basic code reader?
- A basic code reader may be able to clear the code, but it is important to address the root cause of the issue to prevent it from reoccurring.
10. How long does it take to repair OBDII code B1921 Ford (RCM Bracket Ground Resistance High)?
- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take anywhere from a few hours to a day at a professional repair shop.
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