Applicable Systems
OBD-II
Symptoms
An exterior light may not function. The body control module detects a circuit fault. DTC B0270 is stored in the body control module.
Possible Causes
- Bulb failure
- Socket corroded or melted
- Wiring to light fixture broken
- Body control module output driver fault
Troubleshooting Steps
- Step 1: Connect a diagnostic scanner and read body DTCs to confirm B0270
DTC B0270 is present with freeze frame data - Step 2: Inspect wiring and connectors in the affected circuit
Wiring intact, connectors clean and properly seated - Step 3: Perform component-level testing per manufacturer diagnostic procedure
Component values within specification or component confirmed faulty - Step 4: Clear the DTC and verify it does not return
DTC does not return after system self-test
How to Reset
Clear the DTC after repair using a diagnostic scanner. The code will clear automatically if the fault is no longer detected after 3 consecutive drive cycles.
Common Replacement Parts
- varies: Bulb and/or socket (per affected light) (Confirm part number via VIN before ordering)
Frequently Asked Questions
- Q: What does code B0270 mean?
This is a body-related diagnostic trouble code indicating an issue with the body system. The specific component should be diagnosed per the manufacturer's procedure.
- Q: Is code B0270 safe to ignore?
If the code relates to the airbag system (SRS), it is NOT safe to ignore as airbags may not deploy in a crash. For other body systems, the vehicle can typically be driven but the affected feature may not work.
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Source: SAE J2012 Standard OBD-II Diagnostic Trouble Codes
Category: OBD-II
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