What does B0065 mean on a Chevy?

B0065. Left front driver pretensioner deployment loop is open. The module cannot fire the seat belt pretensioner and turns on the airbag light. Applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

What causes B0065 on a Chevy?

Open in the left front driver pretensioner deployment loop Left front driver pretensioner wiring broken under the seat track or sill plate Unseated or corroded left front driver pretensioner connector Left front driver pretensioner with an open squib Faulty driver inside the sensing and diagnostic module for that loop

How do I fix B0065 on a Chevy?

Confirm the code with a Tech2 or GDS2 and read the left front driver pretensioner loop resistance Disconnect the battery and wait at least three minutes before touching any SRS circuit Wiggle-test the left front driver pretensioner wiring under the seat track while reading resistance Reseat the left front driver pretensioner connector and check terminal tension Replace the left front driver pretensioner only if the wiring tests good, using a qualified SRS technician Clear the code and retest

Code

B0065

Left front driver pretensioner deployment loop is open

Category: Body
Severity: Airbag Light
Applies to: Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code
Related: No single generic twin. See OBD Codes List

What it means

B0065. Left front driver pretensioner deployment loop is open. The module cannot fire the seat belt pretensioner and turns on the airbag light. This Chevy-enhanced code applies to Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile and Saturn models that use this code.

Findings, check these first

Open in the left front driver pretensioner deployment loop
Left front driver pretensioner wiring broken under the seat track or sill plate
Unseated or corroded left front driver pretensioner connector
Left front driver pretensioner with an open squib
Faulty driver inside the sensing and diagnostic module for that loop

Standard procedure

Confirm the code with a Tech2 or GDS2 and read the left front driver pretensioner loop resistance
Disconnect the battery and wait at least three minutes before touching any SRS circuit
Wiggle-test the left front driver pretensioner wiring under the seat track while reading resistance
Reseat the left front driver pretensioner connector and check terminal tension
Replace the left front driver pretensioner only if the wiring tests good, using a qualified SRS technician
Clear the code and retest

Look up another code

Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.

Sources and review

Review: checked against the recorded source material.

Code B0065 definition | OBDII.pro
live manufacturer definition (obdii.pro)
Supports: GM manufacturer meaning for B0065
Fetched directly. The GM entry is the brand-family meaning used here. This site is independent of engine-codes and autocodes.
B0065 CHEVROLET Left Front/Driver Pretensioner Deployment Loop Open | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: Chevrolet meaning and possible causes
Fetched directly. Model and year fitment remain curator claims.
B0065 CHEVROLET Left Front/Driver Pretensioner Deployment Loop Open | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Chevrolet meaning and causes
Same Chevrolet text as the engine-codes page (both sites share one publisher).

Last updated 2026-10-10.

Report a correction for B0065. Include your vehicle, the issue and a source if you have one.