By iCarsoft Official Store Technical Team, Automotive Diagnostics Editors · Updated October 18, 2026 · Technical sources checked
Quick Answer
B0058 historically describes an open passenger seat-belt pretensioner deployment loop. It is not simply an unbuckled belt and does not prove a failed pretensioner. Save the full SRS report, identify the exact OEM circuit and have a qualified technician isolate the connection or harness path before ordering a restraint assembly.
What Does the B0058 Code Mean?
B0058 historically describes an open passenger pretensioner deployment loop. Open is an electrical continuity classification, not an unlatched buckle, unbelted passenger or proven deployment. Confirm the complete OEM record before identifying the affected device and diagnostic branch. The full fault record determines the test branch.
The pretensioner deployment loop supervises a pyrotechnic electrical path. An interface or harness can interrupt it without a failed device. Buckle-switch state and ordinary retraction are different functions.
Confirm the exact belt equipment and routing. A front passenger code does not guarantee that all affected wiring is under the seat. The verified extended-cab example makes this distinction relevant before a belt assembly is ordered.
An open firing-loop classification differs from a seat-belt reminder switch state. Buckling the belt may change a reminder but cannot prove deployment-loop continuity. The reporting controller and exact text determine which system the technician must diagnose.
GM 14609, dated September 2015, names B0058 in its technical condition for certain 2004–2009 Colorado/Canyon extended cabs. The condition involves fatigue of a rear access-door harness and possible front pretensioner impairment. The document tells technicians to determine the affected harness from the DTC rather than replace both sides automatically.
This OEM example is directly useful for an open-loop article: a named front restraint circuit can require diagnosis of its body route. It still does not prove a reader's B0058 comes from the door harness.
Match the VIN, full code, symptoms and current service information, and preserve the diagnosis instead of treating the historical special-coverage notice as a present repair entitlement.
Save the full module wording and suffix before clearing; they can change the test path.
Separate B0058 from adjacent fault families
| Code | General description | Key distinction |
|---|---|---|
| B0058, historical | Passenger pretensioner deployment loop open | Electrical path continuity, not buckle position. |
| B0057, historical | Passenger loop resistance low | Different fault classification and diagnostic branch. |
| B0059, historical | Passenger loop ground/voltage concern | Do not diagnose it as an open path without full OEM evidence. |
| B0065, historical | Driver pretensioner loop open | Different side in this legacy table; vehicle mapping controls. |
Record the complete B0058 description. The suffix, reporting module and companion faults can change the diagnostic path. Use the manufacturer's full wording and test procedure for the exact vehicle.
B0058 Symptoms and Likely Causes
Record B0058 symptoms and fault status; symptoms alone cannot identify a failed part.
Check whether companion faults share a proven cause.
Preserve the warning and full B0058 state before clearing. The code does not independently establish which other restraint functions are available.
Normal latching and retraction are not proof that the pyrotechnic deployment path is complete. Report a damaged or unusable belt as a separate immediate concern.
Record work affecting the passenger belt, body route or access-door harness. Do not manipulate restraint wiring to recreate the warning.
A history code can retain a prior interruption. A warning that is absent at the appointment does not establish an intact connection or justify discarding the report.
Practical cause-checking order
- Fault-system identification: Confusing the reminder switch with the deployment loop can send diagnosis toward an unrelated buckle input. Confirm the full OEM description, suffix and reporting module instead of relying on a generic seat-belt translation.
- Incomplete interface: A disconnected, incompletely retained or damaged interface can interrupt the relevant path. The qualified procedure determines access and inspection; reconnecting a live safety connector is not owner-level diagnosis.
- Harness interruption: Harness damage or fatigue is a documented branch in the scoped GM extended-cab example. Other vehicles require their own routing evidence, and a visible door boot alone cannot locate or prove an internal interruption.
- Installation or part issue: An incompatible restraint part, incorrect routing or incomplete reassembly after belt or collision work can produce a continuing concern. Verify the exact serviceable device rather than assuming all passenger pretensioners interchange.
- Component isolation: The pretensioner or controller requires approved isolation evidence. An open label does not authorize bypassing, reuse or speculative assembly replacement.
Did B0058 appear after recent passenger belt, rear access-door harness, interior or collision work? Recheck the documented connections, parts and setup steps affected by that work. Record battery and software history; a post-repair code does not prove the new part is defective.
How Serious Is B0058, and Can You Drive?
Seek qualified SRS diagnosis and follow the owner's manual and any VIN-specific do-not-drive recall. A latching passenger belt does not establish pretensioner readiness or a safe travel distance. GM 14609's limited airbag statement cannot be generalized to every B0058 warning. Stop use for an unusable belt, deployed restraint or immediate hazard.
Record warning messages, operating conditions and service history. Do not induce wheel slip, emergency braking or a handling event on public roads. A red stop warning or abnormal control overrides any verification plan.
Stop and arrange a tow if there is crash damage, a deployed restraint, smoke, heat, damaged safety wiring, an unusable belt or a vehicle stop warning.
Do not probe a pretensioner firing circuit, install a bypass resistor, bridge its wires, apply voltage or activate it. Do not erase crash data or reuse a deployed restraint as a repair strategy. Battery isolation, discharge timing, handling and re-enabling belong to the exact professional OEM procedure.
How to Diagnose B0058 in the Right Order
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Save the complete continuity concern
Save the entire supported SRS report, B0058 wording, suffix, status and companions before clearing. Record belt/door work and warning timing. An open electrical record must not be rewritten as proof of collision or deployment.
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Separate firing-loop and buckle-switch functions
Identify the OEM descriptor, actual passenger pretensioner and equipment. Separate deployment-loop continuity from buckle, occupancy and reminder signals. Normal switch data cannot certify the firing circuit or physical condition of the device.
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Trace the OEM route before parts
Trace the approved route through current wiring views. For an application matching 14609, have the technician assess its affected rear-door harness. Do not transfer that route to unrelated vehicles or assume all wiring remains under the seat.
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Require approved open-path diagnosis
Use the professional non-deployment open-path procedure and approved SRS equipment. No meter connection, jumper, substitute load, pinout or generic battery wait is supplied. Unplugging a firing device to observe a code change is unsafe owner diagnosis.
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Confirm the interrupted section
Require identification of the interrupted connection, harness, device or controller and its permitted supporting result. If a belt is quoted, ask what ruled out the external route and confirms the correct serviceable component.
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Verify reassembly and the original conditions
Complete routing, retention, setup, enabling and non-deployment prove-out. Preserve the final report and approved original-condition result. A buckle click, dark lamp or accepted erase cannot independently establish a complete repaired deployment path.
Specifications are vehicle-specific. Use the exact VIN specifications, approved test points and required operating state. No generic value or drive cycle can replace the applicable procedure. Manufacturer examples here do not establish specifications for other applications.
B0058 Repairs and Cost Planning
A B0058 repair must address the demonstrated failure. Do not replace an assembly from the code alone.
Recheck installation and required setup after repair. An approved continuity repair restores the correct path and its mechanical protection. A resistor that suppresses the fault does not restore a pretensioner. If a harness is replaced, the routing, connector retention and other specified post-service requirements remain part of the repair.
Ask the shop to name the failed branch and the measurement supporting each proposed repair.
Authorize diagnosis before parts while the cause remains uncertain.
| Possible path | Quote basis |
|---|---|
| Proven OEM-approved passenger pretensioner connector or terminal repair | VIN-specific quote |
| Confirmed open harness-section repair or specified affected harness replacement | VIN-specific quote |
| Correct restraint device or controller service only after approved isolation | VIN-specific quote |
| Required setup, non-deployment prove-out and full final SRS report | VIN-specific quote |
These are alternative repair paths, not prices to add together. Request a VIN-specific quote separating diagnosis, parts, labor, fluids, taxes, required setup and verification. Ask which failed test supports the proposed repair and whether warranty coverage applies.
Using iCarsoft CR Pro S for B0058
On a supported vehicle, iCarsoft CR Pro S can save accessible faults, available freeze frame, live data and diagnostic reports. Preserve the B0058 evidence before clearing.
Compare the saved and final module records. Scan data supports diagnosis but does not replace the OEM reference, physical measurement or safety-system functional check.
Preserve the legacy passenger pretensioner open circuit evidence
iCarsoft CR Pro S
Review supported codes and relevant live data together. Confirm the exact VIN, controller access, PIDs with iCarsoft before purchase; generic product capabilities do not guarantee a B0058-specific function.
Check current CR Pro S price and availabilityCheck CR Pro S compatibility by VINThe official product page describes supported full-system diagnostics, available live data, freeze frame and diagnostic reports; exact ECU access and non-deployment functions depend on the VIN and software. Confirm the requested function by VIN before purchase. Follow OEM prerequisites and stop for abnormal operation.
Know the measurement boundary. Scan data describes ECU-provided information; it does not directly prove the physical condition of the legacy passenger pretensioner open circuit. Where required, use qualified SRS equipment and the OEM non-deployment continuity procedure and compare reported values with the relevant measured evidence.
Verify the B0058 Repair
After repair, verify installation, clearance and required setup. Save the final findings and clear only erasable records as instructed. Battery disconnection is not a repair.
Use the manufacturer's non-deployment post-service restraint checks in a qualified workshop. Compare the original operating state with current data for the legacy passenger pretensioner open circuit, and check current and pending faults in related modules. A clean start or idle period does not prove the repair; use the OEM functional check for the affected system.
Compare the original and final fault status. Record the functional-check result and whether the original event returned.
If B0058 returns, compare its suffix, status, failure order and operating conditions with the saved baseline before replacing another part. Revisit the failed branch and inspect anything disturbed. Confirm the prescribed affected-system functional verification separately from code clearing.
Verification follows the system involved. After saving the original evidence, use the OEM procedure to clear erasable records, complete any required calibration or functional check, and compare the final module status with the original warning and fault conditions.
Related Legacy Passenger Pretensioner Open Circuit Code Guides
Compare the related monitor families below. Shared symptoms or components do not make their repair procedures interchangeable.
B0058 Frequently Asked Questions
Will buckling the passenger belt clear a B0058 open-loop fault?
A buckle switch and a pretensioner deployment loop are different functions. The historical B0058 label describes an electrical continuity concern, not simply an unlatched belt. Preserve the full code and have the qualified technician diagnose the exact OEM path; do not bridge a switch or fit a resistor to suppress the warning.
What should I check first for B0058?
Save every module's codes and freeze frame before clearing. Confirm the full definition, suffix and VIN architecture. Then inspect recent passenger belt, rear access-door harness, interior or collision work, connectors and shared supplies. Those facts determine whether the next test needs qualified SRS equipment and the OEM non-deployment continuity procedure or a qualified non-deployment restraint procedure.
Can I drive with the B0058 code?
Seek qualified SRS diagnosis and follow the owner's manual and any VIN-specific do-not-drive recall. A latching passenger belt does not establish pretensioner readiness or a safe travel distance. GM 14609's limited airbag statement cannot be generalized to every B0058 warning. Stop use for an unusable belt, deployed restraint or immediate hazard.
Why did B0058 return after a part was replaced?
If B0058 returns after belt replacement, the interrupted path may remain at an external connection or in the body harness. Verify the correct device and full returning code, including whether its status changed. A fault-free stationary moment cannot rule out an intermittent interruption tied to the original service concern.
What should a B0058 repair estimate include?
Ask for the failed-test evidence and a VIN-specific breakdown of diagnosis, parts, labor, taxes, required setup and verification. A code alone cannot establish the repair price.
Can CR Pro S diagnose and clear B0058?
On a supported vehicle, CR Pro S can organize available faults, freeze frame, live data and reports, and can clear erasable records after repair. Confirm exact ECU coverage. It must not be used to deploy, bypass or erase crash data and cannot replace the qualified OEM procedure for the legacy passenger pretensioner open circuit.
The iCarsoft Official Store Technical Team maintains the store's fault-code library. This guide organizes published technical references and verified product information; it does not document a hands-on test of a particular vehicle or claim an individual engineer's review.
Technical and cost references
- Gunson Instruction 77031 — EOBDII Fault Code Reader with CAN Protocol. Undated historical B-code table, printed page 7; not current universal SAE authority.
- GM 14609 — Special Coverage Adjustment – Airbag Readiness Light / Supplemental Inflatable Restraint (SIR) Light On. September 2015; explicitly includes B0058 in the stated extended-cab rear-door harness condition.
Product information: Official iCarsoft CR Pro S page.
Editorial note: General diagnostic education, not a substitute for the owner's manual, current VIN-specific service information or professional inspection. Test limits, procedures, coverage and costs vary. Related articles provide context; apply only the specifications and repair procedures that match the vehicle. No universal failure rate, repair price or outcome is implied.
