B2151 Outside Rearview Mirror Position Sensor Input Voltage High

OBD2 Code Definition: B2151 is a manufacturer-specific trouble code indicating that the input voltage from the outside rearview mirror position sensor is higher than expected. This can be due to issues such as wiring problems, a faulty sensor, or a malfunctioning mirror control module.

B2151: Outside Rearview Mirror Position Sensor Input Voltage High

Severity: Moderate

Common Causes

b2151 – Outside Rearview Mirror Position Sensor Input Voltage High

Common causes:

• Faulty outside rearview mirror position sensor
• Short circuit in the wiring harness
• Corrosion or poor connection at the sensor connector
• Issues with the power supply to the sensor

 

Common Misdiagnosis

OBD2 Code: B2151

Description: Outside Rearview Mirror Position Sensor Input Voltage High

Common Misdiagnosis: Replacing the mirror position sensor without checking for wiring issues or connector problems.

 

Common Diagnostic Steps

OBD2 Code: B2151

Description: Outside Rearview Mirror Position Sensor Input Voltage High

Common Diagnostic Steps:

• Verify the code using an OBD2 scanner and clear it to see if it returns.
• Inspect the wiring and connectors related to the outside rearview mirror position sensor for any signs of damage, corrosion, or loose connections.
• Check the voltage at the mirror position sensor using a multimeter to ensure it is within the manufacturer’s specified range.
• If applicable, test the operation of the mirror adjustment switch to ensure it is functioning correctly.
• Examine the mirror position sensor itself for any physical damage or malfunction.
• If all components appear normal, consider reprogramming or replacing the vehicle’s control module that manages mirror functions.
• After repairs, clear the code again and perform a road test to confirm that it does not return.