Code B2601 indicates the body control module (BCM) did not receive a latch-engagement signal from the door latch assembly when the door was commanded to close. The system therefore interprets the door as unlatched and may trigger a reversal or warning.
The latch-mounted position sensor or microswitch that reports full engagement can wear, contaminate, or fracture, preventing the BCM from seeing a valid latch signal.
Flex fatigue, corrosion, or a loose connector at the door jamb can interrupt the latch signal circuit between the latch assembly and the BCM.
If the striker is out of position or worn, the latch may not fully engage even though the door appears closed, so the sensor never switches to the latched state.
Certain model years have documented BCM firmware that misinterprets a valid latch signal; a reprogramming update may resolve the condition.
Internal driver or input circuit failure in the BCM can prevent latch-signal recognition, but this is rare compared to latch or wiring issues.
It may clear the stored code temporarily, but the fault will return on the next door-close cycle if the underlying latch, wiring, or alignment issue is not corrected.
No. The majority of B2601 occurrences are traced to the door latch assembly, its wiring, or striker alignment; BCM failure is uncommon and should be confirmed only after all other causes are eliminated.
On some vehicle platforms a BCM reprogramming addresses a known logic issue; consult the applicable technical service bulletin for the specific vehicle.
The code primarily impacts convenience features (locks, lamps, keyless entry) and may prevent the door from latching securely; it does not affect engine or brake operation.