Code B0086 indicates a fault in the deployment control circuit for the third row left seat belt load limiter, which is part of the supplemental restraint system (SRS). The load limiter is designed to release a controlled amount of belt webbing during a crash to reduce injury forces. A stored B0086 code means the restraint control module has detected an electrical or functional problem in that specific circuit.
The seat belt assembly itself, including the internal load limiter and pretensioner squib, is the most common failure point for this code due to age, prior deployment, or internal open/short.
Damaged, corroded, or loose wiring under the seat or in the floor harness can cause an open, short, or high-resistance condition in the deployment control circuit.
The electrical connector at the load limiter may be partially seated, backed out, or have bent pins, causing the module to flag a circuit fault.
A failure of the restraint control module itself is rare and should only be considered after the seat belt assembly, wiring, and connectors have been verified good.
The vehicle may drive normally, but the third row left seat belt load limiter may not function as intended in a crash. The SRS system should be inspected and repaired before relying on that seating position.
No. B0086 relates to the supplemental restraint system and the third row left seat belt load limiter circuit, not the engine computer. The restraint control module is also rarely the cause; the seat belt assembly or wiring is far more likely.
Yes. A disconnected, corroded, or poorly seated connector at the third row left seat belt load limiter is a common cause and should be inspected before replacing any components.
Not necessarily. The code indicates a circuit fault, which can be caused by wiring or connector issues. However, if the load limiter has mechanically deployed or been in a crash, the seat belt assembly must be replaced.