B0066.mp4 Apr 2026

The code (often paired with B0065 ) is a diagnostic trouble code related to a vehicle's Supplemental Restraint System (SRS) , commonly found in General Motors vehicles like the Chevrolet Colorado and GMC Canyon. It indicates a fault in the passenger-side seat belt pretensioner circuit, which is critical for safety during a collision.

: In trucks like the Colorado and Canyon, wires pass through a rubber boot in the door jamb. Years of opening and closing the door can cause these wires to stretch and eventually snap . b0066.mp4

: Exposure to moisture can corrode impact sensors or wiring harness pins, disrupting the signal. The code (often paired with B0065 ) is

: Right (passenger side) Frontal Deployment Loop.Specifically, these codes often point to a short to ground , an open circuit , or voltage out of range for the pretensioner—the device that pulls the seat belt tight in an accident. 2. Common Causes Years of opening and closing the door can

While it may seem like a major component failure, the root cause is often a simple electrical break: