B1E21 - Backup Battery Circuit Voltage Below Threshold

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3    What is this?
Table of contents

B1E21 Possible Causes

  • Faulty Backup Battery
  • Backup Battery harness is open or shorted
  • Backup Battery circuit poor electrical connection
  • Faulty Emergency Assistance Module (EAM)

How do I fix code B1E21?

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's pins.

Cost of diagnosing the B1E21 code

Labor: 1.0

The cost of diagnosing the B1E21 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

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

B1e21 Description

The Emergency Assistance Module (EAM) monitors the Backup Battery Circuit. The EAM sets the OBDII code when it detects a low backup battery.
OBDII Code B1e21 - Backup Battery Circuit Voltage Below Threshold - AutoCodes.com

B1E21 More Information

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Information for specific makes

  • B1E21 CHRYSLER Backup Battery Circuit Voltage Below Threshold
  • B1E21 DODGE Backup Battery Circuit Voltage Below Threshold
  • B1E21 JEEP Backup Battery Circuit Voltage Below Threshold
  • B1E21 RAM Backup Battery Circuit Voltage Below Threshold

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