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Severity: High Code type: Manufacturer-specific (Chevrolet)

Chevrolet B0081 Code: Passenger Presence System Module Fault

The airbag module reports a problem with the passenger presence module under the right front seat.

Safety first · Consult a professional

  • Airbag (SRS) circuits must only be serviced by a professional. Never probe airbag connectors — accidental deployment causes serious injury.

At a glance

Severity: 4/5 – High4/5

Severity: High

Meaning
Passenger Presence System Module Fault
System
Body Systems · Body
Safe to drive?
With caution
Typical repair cost
$100–$1,200
DIY difficulty
Professional only

GM's passenger presence system (PPS) decides whether the front passenger airbag should be armed, based on a sensor inside the seat cushion and a small control module mounted under the passenger seat. The airbag control module (SDM) and the PPS module test each other at every key-on and keep talking while you drive; B0081 is stored when the SDM receives a fault report from the PPS module or can't get a valid status from it. The trailing symptom byte tells a technician whether the module reported an internal fault, a supply or communication problem, or something coming from the seat sensor. Common on Silverado, Tahoe, Suburban and Impala, it's frequently caused by a disturbed connector under the seat rather than a failed module, and it often appears together with B0074 when the sensor side is involved.

How to read B0081

How to read B0081B10203814
  1. B Body
  2. 0 Generic (SAE)
  3. 0 Body Systems
  4. 81 Specific fault

Symptoms

  • Airbag warning light on or SERVICE AIRBAG message
  • PASSENGER AIRBAG OFF indicator lit with an adult in the seat
  • PASSENGER AIRBAG ON indicator lit with an empty seat
  • Passenger seat belt reminder behaving oddly
  • Warning started after the seat was removed, cleaned or had something spilled under it
  • Light comes and goes when the seat is moved or someone shifts their weight

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Connector at the PPS module not fully latched or disturbed during seat or carpet work 30%
  2. Seat-cushion sensor or its pigtail damaged or strained, reported through the module 24%
  3. Internal PPS module failure, sometimes after a drink or water spill under the seat 18%
  4. Blown fuse, poor ground or low battery voltage to the PPS module 12%
  5. Seat harness pinched by the seat track or frame 10%
  6. PPS setup (empty-seat zero) not performed after seat or module service 6%

Diagnosis step by step

Diagnostic flow: B00811Read the SDM and PPS codes withsymptom bytes2Check battery voltage and fuses3Look under the seat withoutunplugging anything4Have the module connectors verified5Test power, ground and communication6Replace parts only as GM specifies,then run PPS setup

  1. Read the SDM and PPS codes with symptom bytes

    A scan tool with GM SRS access shows B0081 with its symptom byte and any codes in the PPS module itself. Note whether B0074 is stored as well, because that shifts suspicion to the seat sensor and away from the module.

    Tools: OBD-II scanner

  2. Check battery voltage and fuses

    Confirm the battery holds around 12.4 to 12.6 V at rest and check the SRS and PPS fuses listed in the owner's manual. Low voltage at key-on can make the module fail its self-test.

    Tools: Multimeter

  3. Look under the seat without unplugging anything

    With a flashlight, check for spilled liquid, objects jammed under the seat, and a harness pulled tight when the seat moves. Do not unplug the yellow SRS connectors yourself; that is technician work with the battery disconnected and a waiting period.

    Tools: Flashlight

  4. Have the module connectors verified

    A technician disconnects the battery, waits the specified time, then presses each connector at the PPS module firmly until it clicks and checks terminals for spread or corroded pins. If a loose connector was the cause, the PPS setup is run and the job is done.

    Tools: OBD-II scanner

  5. Test power, ground and communication

    With the module reconnected, the technician measures its battery feed and ground and checks the data line to the SDM. A good supply with no communication, or a module that reports an internal fault, means the module is the problem.

    Tools: Multimeter

  6. Replace parts only as GM specifies, then run PPS setup

    Depending on the vehicle, the PPS module is replaced alone or together with the sensor and cushion as a matched kit. Afterward the PPS setup must be completed with an empty seat and the scan tool, and the airbag light must go out on its own.

    Tools: OBD-II scanner

Where the parts are

Charging system and control modules – B00811234567
Charging system and control modules
  1. 1Battery
  2. 2Alternator
  3. 3Engine computer (ECM)
  4. 4CAN bus
  5. 5Transmission
  6. 6Wheel speed sensor
  7. 7High-voltage battery

Repair options & costs

RepairDIY?Estimated cost
SRS diagnosis with GM-capable scan tool No $100–$200
Reseat PPS connectors and run PPS setup No $100–$250
Repair or reroute seat harness No $150–$350
Replace PPS module with setup No $300–$700
Replace PPS sensor/module kit with seat cushion No $500–$1,200

Rough US estimates for parts and labor; shop rates vary by region. Not a quote.

Emissions / smog test impact

Depends

B0081 doesn't affect an OBD emissions test. In states with a safety inspection, an airbag warning light that stays on can cause a failure.

Frequently asked questions

Should I just replace the PPS module?

Not before the connectors and seat sensor are checked. On several Chevrolet models GM specifically directs technicians to check the module connector and sensor routing first, because many B0081 codes clear once the connection is fixed and the PPS setup is run.

What is the PPS setup?

It's a scan-tool procedure run with the passenger seat empty that teaches the system what 'nobody in the seat' looks like. It's needed after seat removal, connector work or part replacement; skipping it can bring the code right back.

Can a spilled drink cause B0081?

Yes. The module sits under the passenger seat, and liquid that runs through the cushion or across the floor can corrode its connector or damage it internally. Tell the technician about any spill, since it changes where they look first.

Is it safe for my child to ride up front while this code is on?

Children should ride in the back seat regardless, and with B0081 the system can't be trusted to switch the airbag off for a small occupant. Keep the front seat for adults only, and only when necessary, until it's repaired.

Sources