AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Generic - B1971

B1971 Code - Inadvertent Power Fault

- Code Popularity: 5,978 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC B1971?

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 Inadvertent Power Relay
  • Inadvertent Power Relay harness is open or shorted
  • Inadvertent Power Relay circuit poor electrical connection
  • Faulty Body Control Module (BCM)
⚠ Does your Car have Safety Recalls? → Check here

How to Fix the DTC B1971?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for B1971 Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1971 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

Code B1971 Description

If interior lights are accidentally left on, a Delayed Interior Lighting (DIL) feature provides automatic shutoff. The DIL relay is an integral component of the multifunction relay. When the ignition switch is in RUN position, The Body Control Module (BCM) continuously keeps output to DIL relay active. When the ignition switch is turned to OFF position, BCM will deactivate DIL relay output after 10 minutes. The 10-minute time-out period resets anytime BCM wakes up and any of the following states are detected:
- A door is opened or closed, or driver door unlock message is received.
- The trunk is opened or closed.
- Interior lights are turned on. When DIL relay is energized, power is supplied to interior lights and high side of the interior light relay coil.
The BCM continuously monitors output to DIL relay. The Diagnostic Trouble Code (DTC) B1971 will set when output is commanded on or off, and short or open is detected for at least 2 seconds. When DTC B1971 is set, BCM will continue to command the requested state of relay until it is achieved or no longer necessary. DTC B1971 will clear when conditions for fault no longer exist or when scan tool is used. A history DTC will clear after 50 consecutive ignition cycles if conditions for fault no longer exist.

OBDII Code B1971 - Inadvertent Power Fault - AutoCodes.com
B1971 Code - Inadvertent Power Fault

Need More Information on the Code?

Need more information on how to fix the B1971 code? Get Access to Factory Service Manuals

Information for Specific Makes

Need Help with the Code?

Get the B1971 code diagnosed by a professional: Find a repair shop in your area

Code B1971 comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the B1971 code? Have you replaced any parts?
Any information is appreciated. Thanks