Code
B0058
HUMMER
B — Body
Right Front/Passenger Pretensioner Deployment Loop Open
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring in the pretensioner circuit
- Corroded, bent or loose connector at the pretensioner or at the SRS module
- Damaged or missing connector terminal / poor crimp
- Previous crash deployment not repaired correctly (cut or disconnected squib)
- Failed pretensioner squib (open internal coil)
- Faulty or damaged SRS/airbag control module or connector
Symptoms
- SRS / airbag warning lamp illuminated on instrument cluster
- Right front pretensioner will not deploy in a crash (function disabled)
- Possible stored crash data or other SRS-related DTCs
- Vehicle fails safety inspection where airbags are checked
What to check
- Read and record all SRS codes with a capable scan tool; note freeze frame and related codes
- Visually inspect right-front seat area, seat belt pretensioner, and wiring harness for damage, pinched wires, corrosion or aftermarket modifications
- Inspect connectors at the pretensioner and at the SRS module for loose pins, bent terminals, corrosion or pushed-out terminals
- Measure continuity/resistance of the pretensioner circuit per service manual with SRS system disabled
- Verify whether the vehicle has unrepaired prior deployment or visible crash damage
Signal parameters
- Expected squib resistance (typical): low ohms (manufacturer varies; often ~0.5–3 Ω). Consult factory specification.
- Open-circuit condition: infinite resistance (OL) or no continuity between pretensioner terminals
- No deployment voltage present until a commanded deployment event; do not energize squib outside controlled environment
- Module reports line open fault set by internal monitoring (open detected at time of SRS scan)
Diagnostic algorithm
- Read and record all SRS DTCs with a qualified scan tool and attempt an initial code clear to confirm repeatability.
- Check vehicle history for recent deployments or seat/seatbelt work. If recent deployment found, inspect repairs and connectors first.
- Follow manufacturer SRS safety procedure: disable SRS power and wait the specified power-down interval (consult factory documentation) before disconnecting connectors or measuring squib resistance.
- Visually inspect the pretensioner connector and wiring under the right front seat and along the harness route to the B-pillar and to the SRS module. Look for chafing, broken insulation, or pinched wires.
- With SRS disabled and connectors accessible, measure continuity/resistance of the pretensioner circuit from the pretensioner connector to the SRS module connector. Expected: low ohms; an open (OL) indicates a break in circuit.
- If open at the module connector but intact at the pretensioner, trace harness and repair broken wire/splice or replace damaged harness section.
- If open at the pretensioner connector, inspect connector pins; if pins are damaged or corroded, repair or replace connector and terminals. If harness and connector appear good, replace pretensioner assembly.
- If continuity is correct but module still reports open, inspect module connector pins and grounds. If necessary, test SRS module inputs per factory procedures or consider module replacement only after all wiring and pretensioner checks are complete.
- After repairs, reconnect and restore SRS power, clear codes with scan tool, and verify the SRS lamp extinguishes and code does not return. Perform full SRS system check per manufacturer.
Likely causes
- Open or severed wire in harness between right front pretensioner and SRS module
- Disengaged or corroded connector at the pretensioner (under seat or at B-pillar)
- Cut/incomplete repair after prior airbag deployment
- Defective pretensioner (internal open circuit)
Fault status
Status
Right front (passenger) pretensioner squib circuit open. SRS control module detects no continuity in the deployment loop for the right-front pretensioner; corresponding safety function is disabled and the SRS warning lamp is illuminated.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Repair manuals
Manual library for HUMMER
138
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