AutoCodes – RAM – B21F7 RAM

B21F7 RAM Code - Electronic Shifter Power Supply Circuit Short To Ground

Quick Answer

The Body Control Module (BCM) monitors the Electronic Shifter Power Supply Circuit. Common causes include Faulty Brake Lamp Switch, Brake Lamp Switch harness is open or shorted, Brake Lamp Switch 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: B21F7 RAM indicates Electronic Shifter Power Supply Circuit Short To Ground.
Common causes: Common causes include Faulty Brake Lamp Switch, Brake Lamp Switch harness is open or shorted, Brake Lamp Switch 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 442

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 30, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B21F7 RAM Description

The Body Control Module (BCM) monitors the Electronic Shifter Power Supply Circuit. When the Body Control Module (BCM) detects a short to ground on the Brake Lamp Switch Output circuit and the stop lamp switch is activated four times.

OBDII Code B21F7 RAM - Electronic Shifter Power Supply Circuit Short To Ground - AutoCodes.com — B21F7 RAM Code - Electronic Shifter Power Supply Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B21F7 RAM?

Faulty Brake Lamp Switch
Brake Lamp Switch harness is open or shorted
Brake Lamp Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B21F7 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 B21F7 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.

Need more information about the B21F7 RAM code?

Need more information on how to fix the B21F7 RAM code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B21F7 RAM code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B21F7 RAM Code

1. What are the common symptoms of OBDII code B21F7 RAM - Electronic Shifter Power Supply Circuit Short To Ground?

- Common symptoms include issues with shifting gears, the gear selector not responding, and possible illumination of the Check Engine Light.

2. What are the potential causes of OBDII code B21F7 RAM?

- The code B21F7 RAM can be caused by a short to ground in the electronic shifter power supply circuit, a faulty shifter assembly, damaged wiring, or a malfunctioning control module.

3. How can I diagnose the Electronic Shifter Power Supply Circuit Short To Ground issue?

- Diagnosis typically involves using a scan tool to read the OBDII code B21F7 RAM, conducting a visual inspection of the wiring and connectors, and performing voltage tests on the shifter power supply circuit.

4. What are the repair options for resolving OBDII code B21F7 RAM?

- Repair options may include repairing or replacing damaged wiring, replacing the faulty shifter assembly, or addressing any issues with the control module. It is recommended to follow the manufacturer's diagnostic and repair procedures.

5. Can I continue driving my vehicle with OBDII code B21F7 RAM present?

- It is not recommended to continue driving your vehicle with the B21F7 RAM code as it can lead to further damage to the transmission or other components. It is advised to address the issue promptly.

6. How much does it typically cost to repair OBDII code B21F7 RAM?

- The cost of repairing OBDII code B21F7 RAM can vary depending on the specific cause of the issue, the required parts, and labor costs. It is advisable to consult with a professional mechanic for an accurate estimate.

7. Is OBDII code B21F7 RAM a serious issue?

- OBDII code B21F7 RAM, indicating an Electronic Shifter Power Supply Circuit Short To Ground, should be addressed promptly to prevent potential transmission or shifting problems. Ignoring the issue could lead to further damage.

8. Can a DIY enthusiast fix OBDII code B21F7 RAM at home?

- Depending on the root cause of the issue, DIY enthusiasts with the necessary skills and tools may be able to address OBDII code B21F7 RAM at home. However, it is recommended to have a professional diagnosis to ensure a proper repair.

9. How long does it take to repair OBDII code B21F7 RAM?

- The repair time for OBDII code B21F7 RAM can vary based on the complexity of the issue, the availability of parts, and the expertise of the mechanic. It is advisable to consult with a professional for a more accurate timeframe.

10. Will resetting the OBDII code B21F7 RAM clear the issue?

- Simply resetting the OBDII code B21F7 RAM may temporarily turn off the Check Engine Light, but it will not fix the underlying problem causing the code. It is important to diagnose and repair the issue to prevent it from reoccurring.