Body, generic

B0064 Driver Seat Belt Pretensioner Deployment Loop Resistance Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

No publicly available J2012 code list includes B0064; there, B0060 names the driver belt tension sensor. Older airbag modules from General Motors do use it: on the 2006 Saab 9-5, B0064 is set when the resistance of the driver pretensioner loop stays below 1.5 ohms, with a 0.2-ohm tolerance, for 2 seconds; B0065 marks an interrupted loop and B0066 a voltage at pin 34 outside 1.0 to 4.1 V. Saab 9-3 manuals of 2003 and 2007 describe the same fault as too little resistance at the driver's belt tensioner. The module still attempts to fire the pretensioner in a crash. GM bulletin 14609 names B0064 among the codes caused by fatigue breaks in the rear door harness of Colorado and Canyon extended cab trucks, model years 2004 to 2009. Airbag lamp on.

Likely causes

Pretensioner leads shorted together, e.g. squashed harness at the B-pillar
Colorado/Canyon extended cab: fatigued wires in the rear door harness (bulletin 14609)
Damaged or contaminated pretensioner connector
Internal fault of the driver pretensioner squib

Symptoms

  • Airbag warning lamp on
  • Driver belt pretensioner may not work properly in a crash
  • Safety note: pretensioner plugs sit at the B-pillar or under the seat; do not probe the loop and only unplug them with the battery disconnected and the wait time observed

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–700
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

driver seatbelt pretensionersrs seat wiringsrs control module

Related codes

B0060B0070B0057

References: saabwisonline.com, saabwisonline.com, static.nhtsa.gov.