What it means
This code identifies a fault associated with the passenger seat belt pretensioner A deployment control. The restraint control module sets it when it detects a problem in that deployment control; the exact fault is specified by accompanying subfault information.
How it works
The passenger seat-belt pretensioner A is designed to tighten the passenger belt in a qualifying crash. The restraint control module monitors its deployment-control circuit, and B0072 records a fault in that circuit; accompanying subfault information specifies the detected condition.
Common causes
Most likely first.
- Pretensioner wiring or connector fault
- Open or shorted deployment circuit
- Faulty passenger seat belt pretensioner
- Restraint control module fault
Symptoms
- Airbag warning light on
- Passenger seat belt pretensioner may not activate in a crash
How to diagnose it
- Read the restraint module's subfault details and freeze-frame data to identify the condition recorded for the passenger pretensioner A circuit.
- Inspect the passenger belt, retractor, and nearby harness for damage or evidence of seat, trim, or belt repairs.
- Check the passenger pretensioner connectors and wiring for loose connections, corrosion, damaged pins, or chafing, following the manufacturer's restraint-system safety instructions.
- Test the deployment circuit for an open or short using the manufacturer's method and compare results with its specification.
- If the circuit passes, check the passenger pretensioner and then the restraint control module using the manufacturer's diagnostic sequence.
Common fixes
- Reconnect or repair damaged passenger pretensioner wiring or connectors using the approved procedure.
- Repair a confirmed open or short in the passenger pretensioner A deployment circuit.
- Replace the passenger pretensioner if testing confirms a fault in the unit.
- Repair or replace the restraint control module only after the circuit and pretensioner pass their checks.
Can I keep driving?
The vehicle may be driven, but the passenger pretensioner may not tighten the belt in a crash. Avoid carrying a passenger until the restraint fault is repaired.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.