B0073Second Row Left Seat Belt Pretensioner Deployment Control
- Generic OBD-II code · Body
- How the car detects it
- B0073 concerns the pretensioner at the left outer seat of the second row, normally built into the rear retractor. Mitsubishi documents it under exactly this name: with the ignition on, its airbag sensor unit stores B0073 with byte 11, 12, 13, 1A or 1B for a short to ground, a short to power, an open, lines shorted to each other or excessive resistance, and with byte 55 when the stored configuration does not match the vehicle; each fault must last 2 seconds. Toyota's Tundra bulletin T-SB-0057-22 lists B007311 and B007312. IIHS frontal tests with a dummy in the left rear seat show why such units are now spreading to the back row. GM uses the number differently: bulletin 22-NA-170 for the Equinox and Terrain links B0073 to water in the right front seat harness connector X320.
- What you may notice
- Airbag warning lamp on
- Left rear occupant gets no belt pretensioning in a crash
- Safety note: pyrotechnic part in the rear retractor; work only with the system de-energised and preferably at a specialist workshop
- Likely causes
- LikelyPlug at the left rear retractor loose or damaged after trim or seat removal
- PossibleHarness to the left rear pretensioner shorted to ground or power
- RareAirbag module configuration does not match the fitted rear pretensioners (Mitsubishi byte 55)
- RareInternal fault of the left rear pretensioner or of the airbag module
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.