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Home / DTC / B0028 — Right Front/Passenger Side Deployment Loop Resistance Low

B0028 — Right Front/Passenger Side Deployment Loop Resistance Low

Detailed page for trouble code B0028.

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Code

B0028

HUMMER B — Body

Right Front/Passenger Side Deployment Loop Resistance Low

Brand: HUMMER
Type: B — Body
AI status
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Page language: EN

Causes

  • Short to ground or to battery in the right front airbag wiring
  • Damaged or chafed wiring harness near the passenger airbag or dash
  • Corroded, pushed-pin, or contaminated connector at the airbag module or SRS control module
  • Internal short inside the passenger airbag inflator/squib
  • Faulty or damaged SRS (airbag) control module or connector

Symptoms

  • SRS/Airbag warning lamp illuminated on the dash
  • Possible loss of passenger airbag arming or deployment capability (SRS system disables affected circuit)
  • Diagnostic trouble code B0028 stored in SRS control module
  • No obvious vehicle-driveability symptoms (electrical fault limited to SRS)

What to check

  • Verify proper vehicle and battery voltage, then read SRS codes and freeze-frame data with a capable scan tool
  • Perform a visual inspection of passenger airbag, connector, and wiring for damage, pin push-out, corrosion, or chafe points
  • Confirm battery negative disconnected and SRS safe wait time observed before touching airbag connectors
  • Measure resistance of the passenger airbag squib circuit at the airbag connector and at the SRS module connector
  • Check for continuity between the squib circuit and chassis ground or other circuits (identify shorts)
  • Inspect connector locking tabs and pin condition; wiggle-test harness to reproduce fault if intermittent

Signal parameters

  • Expected squib loop resistance: low ohms but within factory specification (refer to service manual for exact value)
  • Fault condition: measured resistance significantly lower than specified or near short-to-ground levels
  • Normal continuity between the two squib circuit terminals; no continuity to chassis ground or other unrelated circuits
  • No battery voltage present at squib terminals with ignition off and SRS system not commanded

Diagnostic algorithm

  1. Retrieve fault code(s) and freeze-frame using a dealer-level or OEM-capable scan tool; record any additional SRS codes.
  2. Follow safety procedure: disconnect negative battery terminal and wait the manufacturer-specified time (typically several minutes) before working on SRS components.
  3. Visually inspect the passenger airbag module, connector, and visible wiring for burns, pin damage, corrosion, or chafing where harness passes through dash, seat, or bracketry.
  4. With battery again disconnected and safety wait observed, disconnect the passenger airbag connector and measure resistance across the squib terminals at the module connector. Compare to factory spec; note if resistance is unusually low.
  5. Measure resistance/continuity between each squib terminal and chassis ground/other circuits to check for a short. A direct low-resistance path indicates a short to ground or to another circuit.
  6. If short suspected in harness, isolate sections by disconnecting intermediate connectors (seat harness, junction blocks) and repeating resistance checks to locate the shorted segment.
  7. If harness and connectors test OK, suspect internal airbag module squib short — replace the passenger airbag module per manufacturer procedure.
  8. If harness/connector damage found, repair or replace affected wiring and connectors using appropriate SRS-rated parts and secure routing/retention to avoid reoccurrence.
  9. After repairs, clear codes with a scan tool and perform SRS system readiness checks. Verify the SRS lamp goes out and the code does not return. Re-scan to confirm no related codes remain.

Likely causes

  • Chafed wiring making contact with chassis ground or other conductors near the passenger seat/dash
  • Connector contamination or bent pins at the passenger airbag or wiring junctions
  • Internal squib/inflator short (airbag module failure)
  • Intermittent short created by seat movement or occupant sensor wiring

Fault status

⚠️ Status
SRS control module reports right front (passenger) deployment loop resistance lower than the allowable threshold. Indicates possible short or low-impedance path in the passenger airbag squib circuit; the module may disable that deployment circuit until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B0020 B0022 B0023 B0027 B0029
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