B2245 – OBD-II DTC

OBD-II DTC B2245 – Passenger Rear Door Ajar Circuit Open

DTC B2245 meaning

DTC B2245 refers to a diagnostic trouble code indicating an issue with the passenger rear door ajar circuit. This code is triggered when the vehicle’s onboard diagnostic system detects an open circuit in the door ajar switch for the passenger rear door. The door ajar switch is responsible for signaling whether the door is closed or open, and a malfunction can lead to incorrect readings, affecting various systems such as interior lights and alarm functions.

DTC B2245 symptoms

Common symptoms associated with DTC B2245 may include:

• Illumination of the dashboard warning light for the door ajar.
• Interior lights remaining on when the vehicle is in motion.
• Chimes or alerts indicating that a door is ajar, even when it is closed.
• Inconsistent operation of the power door locks.

DTC B2245 causes

Several factors can lead to the triggering of DTC B2245, including:

• A faulty door ajar switch.
• Wiring issues, such as frayed or broken wires in the door harness.
• Corrosion or poor connections at the door switch or related connectors.
• Faulty body control module (BCM) that misinterprets the switch signal.

DTC B2245 seriousness

The seriousness of DTC B2245 can vary. While it may not pose an immediate safety risk, it can lead to inconvenience and potential battery drain due to interior lights remaining on. Additionally, it may affect the vehicle’s alarm system and overall functionality. It is advisable to address this issue promptly to avoid further complications.

How to diagnose DTC B2245

To diagnose DTC B2245, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B2245 code.
2. Inspect the passenger rear door ajar switch for visible damage or wear.
3. Check the wiring and connectors for signs of corrosion or breaks.
4. Test the door ajar switch with a multimeter to ensure it operates correctly.
5. Examine the body control module for any faults or error codes.

How to fix DTC B2245 step-by-step instructions

To fix DTC B2245, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
2. Remove the door panel to access the door ajar switch and wiring.
3. Inspect the door ajar switch for damage replace it if necessary.
4. Check the wiring harness for any frayed or broken wires and repair or replace as needed.
5. Clean any corrosion from connectors and ensure all connections are secure.
6. Reassemble the door panel and reconnect the battery.
7. Use the OBD-II scanner to clear the DTC and test the system to ensure the issue is resolved.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.