U047F: Invalid Data Received From Seat Belt Pretensioner Module A

What it means

A receiving module detected implausible data from seat belt pretensioner module A. Squib status or arming voltage values fail plausibility checks and are rejected.

At a glance

• Usually lights the warning light of the system that lost communication

How it works

Seat belt pretensioner module A reports its status to other vehicle modules so the restraint system can assess pretensioner readiness. A receiving module sets U047F when module A's squib status or arming-voltage data fails plausibility checks and is rejected.

Common causes

Most likely first.

1. Module internal fault or sensor input drift
2. Software version mismatch after replacement
3. Gateway module routing CAN messages incorrectly

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Use an SRS-capable scan tool to record the reporting module, related pretensioner or communication codes, and available event data before clearing codes.
2. Check service information to identify which seat belt and restraint functions are designated pretensioner module A on this vehicle.
3. With the ignition off and following the manufacturer's SRS safety precautions, inspect module A's connector and harness for damage, corrosion, looseness, or signs of prior repair.
4. Check module A's power, ground, and network connections using the wiring diagram and compare results with the manufacturer's specification.
5. Review module A's live status and squib or arming-voltage data with an SRS-capable scan tool; do not probe a squib circuit with general-purpose test equipment.
6. If module A was recently replaced, verify the replacement and software configuration against manufacturer service information, then follow the SRS diagnostic procedure for any remaining fault.

Common fixes

• Repair a loose, damaged, or corroded module A connector or harness.
• Restore module A's power, ground, or network connection if testing finds a fault.
• Correct a documented replacement configuration or software mismatch using the manufacturer's procedure.
• Replace pretensioner module A or repair a restraint module or network fault only when diagnosis confirms the cause.

Can I keep driving?

A fault involving pretensioner module A may leave the associated seat belt pretensioner unavailable, and other restraint functions may also be affected. Arrange prompt SRS diagnosis, avoid disturbing restraint wiring, and do not assume the belt will tighten as intended in a crash.