B0081 Passenger presence (seat occupant sensing) system fault

Passenger presence system fault, passenger airbag disabled

B0081 in short

B0081 means the airbag computer has found a fault in the passenger presence system, the seat sensor that decides whether the front passenger airbag may deploy. GM service information says the passenger airbag is switched off and the airbag light stays on while it is set. Have it checked soon, and never probe airbag wiring yourself.

The passenger presence system (PPS) uses a sensor and a small module in the front passenger seat to judge who is sitting there. It reports to the airbag computer, which GM calls the sensing and diagnostic module (SDM).

GM service information sets B0081 when the passenger presence module reports an internal fault, a sensor preload problem, a calibration that was never learned, or the wrong part fitted. The airbag computer then disables the passenger front airbag and turns on the AIR BAG light.

It is often not the module. GM bulletins say most B0081 cases on 2009 trucks and SUVs came from communication, power or ground faults at connectors and splices, that phones or laptops on the passenger seat can set it, and, for the Camaro, not to replace the modules for this concern.

Most likely causes

  1. Poor connection in the passenger presence system power, ground or communication wiring

    Supported by vehicle data
    Why it ranks here
    GM bulletin PIT-4874 says B0081 on 2009 full-size trucks and SUVs most often sets from a communication fault, and directs inspection of connectors, terminals and splice packs before any module is replaced. A Cobalt bulletin also directs a PPS connector inspection.
    What would change this
    Rises if the technician finds a backed-out terminal or poorly seated connector at the PPS, SDM or a splice pack. Falls if all connections are sound.

  2. Electronic device or aftermarket seat heater interfering with the seat sensor

    Supported by vehicle data
    Why it ranks here
    GM bulletin SB-08-09-41-007A and GM service information say computers, MP3 players, phones or a scan tool on the passenger seat, or an aftermarket seat heater, can interfere with the sensor and set B0081.
    What would change this
    Rises if the code is cleared and stays off once the seat is empty. Falls if it returns with nothing on the seat.

  3. Right front seat belt buckle fault

    Possible — needs testing
    Why it ranks here
    GM bulletin SB-07-09-41-010A pairs B0081 in the airbag computer with B0071 in the passenger presence module and has the right front seat belt buckle diagnosed and replaced if necessary.
    What would change this
    Rises if B0071 is stored in the passenger presence module. Falls if it is not.

  4. Passenger presence module internal fault, missing calibration or wrong part

    Possible — needs testing
    Why it ranks here
    GM service information lists an internal module fault, a calibration not learned and an incorrect component installed among B0081's failure types, but GM bulletins warn against replacing modules before the wiring is checked.
    What would change this
    Rises if wiring checks pass and the code's symptom byte points to the module, calibration or part number. Falls if a connection fault is found.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Have the airbag codes read, including the symptom number after B0081 and any codes stored in the passenger presence module.

    Low riskTool: scan tool with airbag (SRS) access

  2. Remove phones, laptops and other objects from the front passenger seat, then have the code cleared and see whether it comes back.

    Low risk

  3. Ask a GM dealer whether a bulletin covers B0081 on your model and year.

    Low risk

    • IfA bulletin applies

      It meansThe dealer follows it, which usually starts with a connector inspection.

      Go to step 4

    • IfNo bulletin applies

      It meansThe system needs the full service manual diagnosis.

      Go to step 4

  4. Have a trained technician inspect the passenger presence system and airbag computer power, ground and communication connections, following the service manual.

    Best left to a shopTool: GM diagnostic tool and service information

    Warning:Never probe airbag connectors or wiring with a test light or meter, and never unplug them yourself. Nissan warns that airbags and pretensioners can still deploy after the ignition is off, and that test equipment must not be used on airbag circuits unless the service manual calls for it. Leave this to a dealer or trained technician.

Symptoms

  • Airbag warning light stays on
  • Passenger airbag off indicator lit with an adult in the seat
  • Passenger airbag indicator and seat belt reminder come on when a phone or laptop sits on the passenger seat

How to fix

This is a safety-critical system, so we explain the code but don't give repair steps. Have it inspected by a qualified technician.

Parts and cost context

  • Passenger presence module and sensor:Don't buy a module first. GM bulletins point to connections and communication faults in most cases, and one Camaro bulletin says not to replace the modules. Any replacement must be the exact part, because GM lists a wrong component as one failure type. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Chevrolet

  • 2009 · Silverado

    Supported by vehicle data

    GM's bulletin says B0081 on these trucks usually comes from a communication fault, so connectors and splice packs are inspected before any module is replaced. Whether it is still current is not verified.

  • 2010–2011 · Camaro

    Supported by vehicle data

    GM's bulletin for B0074 with B0081 tells technicians not to replace the PPS module or airbag computer. Whether it is still current is not verified.

  • 2006–2008 · Cobalt

    Supported by vehicle data

    GM's bulletin has the passenger presence system connectors inspected for B0081. Whether it is still current is not verified.

  • PIT-4874Status unverified

    SIR light with DTC B0081 in the SDM and PPS

    2009silverado, tahoe, suburban, avalanche · issued · NHTSA 10032867

    Most cases are a communication fault. Inspect PPS and SDM power, ground and communication circuits at connectors and splice packs before replacing a module. Also covers GMC and Cadillac trucks and SUVs.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • SB-07-09-41-010AStatus unverified

    Airbag light with B0071 and B0081

    2006–2010silverado, tahoe, suburban, avalanche, impala, monte-carlo · issued · NHTSA 10034404

    With B0071 in the PPS and B0081 in the SDM, diagnose the right front seat belt buckle and replace it if necessary.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • SB-08-09-41-007AStatus unverified

    Electronic devices on the passenger seat may set B0074, B101D or B0081

    2009–2010equinox, traverse, cobalt, hhr, impala · issued · NHTSA 10030788

    Explains that electronics placed on the front passenger seat can interfere with the passenger presence sensor and set these codes.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • PI-0241Status unverified

    Airbag light with B0074 and B0081

    2010–2011camaro · issued · NHTSA 10036025

    Tells technicians not to replace the passenger presence module or the airbag computer for this concern.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 08-09-41-006Status unverified

    SIR light with B0081 stored

    2006–2008cobalt · issued · NHTSA 10025669

    Inspect the passenger presence system connectors.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • B00A0Occupant classification sensor or control unit fault

    Same system Common general cause

    B00A0 is the occupant classification fault on other makes. Like GM's passenger presence system, that system senses who is in the passenger seat and reports to the airbag computer.

All Airbags and seat-belt restraints (SRS) codes

B0081 questions

Can a phone on the passenger seat really cause B0081?

Yes. GM says computers, phones, MP3 players or a scan tool on the seat can interfere with the passenger sensor. Clear the seat and have the code cleared; if it stays off, no further diagnosis is needed.

Does the passenger airbag work while B0081 is set?

GM service information says the airbag computer disables the passenger front airbag while this code is set. Seat children in the back and get it checked soon.

Sources and review

  1. DTC B0081 (SDM): 2011 Saab 9-4X workshop information — Saab Automobile / General Motors
  2. 2023 Accord Owner's Manual: Airbag System Indicators — American Honda Motor Co.
  3. Camry Owner's Manual (OM06291U) — Toyota
  4. PIT-4874: SIR lamp with DTC B0081 set in the SDM and PPS (2009 full-size trucks and SUVs) — General Motors / NHTSA ,
  5. 08-09-41-006: SIR light on, DTC B0081 stored; inspect passenger presence system connectors (Cobalt) — General Motors / NHTSA ,
  6. SB-08-09-41-007A: electronic devices on the front passenger seat may set B0074, B101D or B0081 — General Motors / NHTSA ,
  7. DTC B0081 (passenger presence module): 2011 Saab 9-4X workshop information — Saab Automobile / General Motors
  8. SB-07-09-41-010A: airbag light on, DTC B0071 and B0081 set; diagnose and replace right front seat belt buckle if necessary — General Motors / NHTSA ,
  9. PI-0241: airbag light on with DTCs B0074 and B0081; do not replace the PPS module or SDM (2010–2011 Camaro) — General Motors / NHTSA ,
  10. Nissan Supplemental Restraint Systems: damage analysis and repair using Diagnostic Trouble Codes (TechNews, Summer 2016) — Nissan North America ,
  11. NTB19-071C: DTC B00A0-00 stored (amended) — Nissan North America / NHTSA ,
Last reviewed
Written by
Saurabh K.
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