Engine-Codes - Generic - B121B

B121B Code - Keypad Input Switch

- Code Popularity: 2,510 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
ChatAC AutoCodes.com AI Chat

What are the Possible Causes of the DTC B121B?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Keypad Input Switch
  • Keypad Input Switch harness is open or shorted
  • Keypad Input Switch circuit poor electrical connection
  • Faulty Body Control Module (BCM)

Code Tech Notes

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

⚠ Does your Car have Safety Recalls? → Check here

How to Fix the DTC B121B?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Search for B121B Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the B121B code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the B121B Code Mean?

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.

B121B Code - Keypad Input Switch

Need more Information on the Code?

Need more information on how to fix the B121B code? Get Access to Factory Service Manuals

Code B121B Information for Specific Makes

Need Help with the Code?

Get the B121B code diagnosed by a professional: Find a repair shop in your area