AutoCodes – Ford – B121B Ford

B121B Ford Code - Keypad Input Switch

Quick Answer

The keypad feature operates independently of key position status, vehicle speed, or transmission position. Common causes include Faulty Keypad Input Switch, Keypad Input Switch harness is open or shorted, Keypad Input Switch circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B121B Ford indicates Keypad Input Switch.
Common causes: Common causes include Faulty Keypad Input Switch, Keypad Input Switch harness is open or shorted, Keypad Input Switch circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 6,173

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B121B Ford Description

The keypad feature operates independently of key position status, vehicle speed, or transmission position. When a keypad button is touched, the keypad buttons illuminate to provide better visibility. The keypad is also illuminated any time that the courtesy lighting is on. If the lock all doors command is entered or 5 seconds have elapsed since the last button press, the illumination is turned off. Each vehicle equipped with a keypad is programmed with a 5-digit entry code. This code is provided to the customer through a wallet card in the Owner's Literature. In addition, this code is available through a scan tool and is also printed on the BCM label. When entering codes each digit must be entered within 5 seconds of the previous button press. A DTC that sets when the BCM detects a short to ground on any of the keyless entry keypad input circuits.

OBDII Code B121B Ford - Keypad Input Switch - AutoCodes.com — B121B Ford Code - Keypad Input Switch

What does this mean?

What are the Possible Causes of the DTC B121B Ford?

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

How to Fix the DTC B121B 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 does this mean?

Code Tech Notes

B121B:01 Keypad Input Switch General Electrical Failure
B121B:11 Keypad Input Switch Circuit Short To Ground

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B121B 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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Need Help with the Code?

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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 B121B Ford Code

1. What does OBDII code B121B Ford indicate?

The B121B code for Ford vehicles specifically relates to the Keypad Input Switch, indicating a problem with the keypad input module.

2. What are common symptoms of a B121B Ford trouble code?

Common symptoms of the B121B code may include issues with the vehicle's keypad functionality, such as the keypad not responding or working intermittently.

3. What are possible causes of the B121B Ford trouble code?

Potential causes of the B121B code include a faulty keypad input module, wiring issues, or a malfunction in the keypad itself.

4. How can I diagnose the B121B Ford trouble code?

Diagnosing the B121B code typically involves inspecting the keypad module, checking the wiring for any damage, and testing the keypad buttons for proper functionality.

5. Can I still drive my vehicle with the B121B Ford trouble code?

While the vehicle may still be operable with the B121B code, it is recommended to address the issue promptly to avoid any inconvenience or potential safety concerns related to keypad functionality.

6. How can I repair the B121B Ford trouble code?

Repairing the B121B code often involves replacing the faulty keypad input module, repairing any damaged wiring, or addressing issues with the keypad itself.

7. Is the B121B Ford trouble code a common issue in Ford vehicles?

The B121B code related to the Keypad Input Switch is not as common as some other OBDII codes but can occur in Ford vehicles equipped with keypad entry systems.

8. Can a DIY enthusiast fix the B121B Ford trouble code?

Depending on their skill level and access to tools, a DIY enthusiast may be able to address the B121B code by following repair guides or seeking assistance from online forums.

9. Will resetting the vehicle's computer clear the B121B Ford trouble code?

Resetting the vehicle's computer may temporarily clear the B121B code, but if the underlying issue with the keypad input switch is not resolved, the code is likely to reappear.

10. How much does it typically cost to repair the B121B Ford trouble code?

The cost of repairing the B121B code can vary depending on the specific issue, labor rates, and whether new parts are needed, but it is advisable to consult a mechanic for an accurate estimate.