Code
B0013
Generic
B — Body
Passenger Knee Bolster Deployment Control
AI status
Completed
Completed
100%
Causes
- Open or short in passenger knee airbag squib circuit (wiring or connector)
- Corroded, loose or damaged connector at knee airbag or SRS control module
- Defective passenger knee airbag (squib)
- Faulty SRS (airbag) control module or internal driver circuit
- Improper repairs or aftermarket modifications affecting SRS wiring
- Intermittent harness damage from dash movement or impact
Symptoms
- SRS/airbag warning light illuminated on instrument panel
- Possible disablement of passenger airbag/knee airbag deployment
- Related SRS codes logged (other airbag or restraint system faults)
- Vehicle may fail safety inspection requiring SRS fault correction
What to check
- Confirm battery voltage is within nominal range before testing
- Check for other stored SRS codes and freeze frame data with a capable scan tool
- Visual inspection of knee airbag area, connectors and wiring harness for damage or corrosion
- Verify connector pins are straight and fully seated at knee airbag and SRS module
- Measure squib circuit resistance with OHM meter after disabling the battery and following manufacturer safety wait time
- Inspect dash area for evidence of prior repairs, aftermarket equipment or harness chafing
Signal parameters
- Expected squib resistance: typically low (approx. 0.5–5 ohms depending on vehicle) — consult manufacturer data
- Open circuit (OL/infinite) indicates broken wiring or disconnected squib
- Very low/near 0 ohms indicates short to ground or battery
- SRS control module may report deployment driver voltage or circuit current during active tests (requires OEM scan tool)
- Fault set when measured resistance or circuit behavior outside manufacturer defined thresholds
Diagnostic algorithm
- Safety first: Disable the negative battery terminal and wait the manufacturer-specified time (commonly 90 seconds or per service manual) before touching SRS components.
- Scan: Connect an SRS-capable scan tool. Read and record B0013 and any other stored/ pending SRS codes and freeze frame data.
- Visual: Inspect the passenger knee airbag module, connector, and wiring harness for damage, corrosion, pushed-out pins, or loose clips. Repair any obvious damage.
- Connector check: With battery still disconnected, disconnect the knee airbag connector and inspect/clean terminals. Reconnect firmly and re-check the code.
- Resistance test: Measure resistance across the knee airbag squib circuit at the connector and at the SRS module side (if accessible). Compare to manufacturer specification. Note: do not attempt resistance checks with battery connected.
- Continuity and short test: Check continuity from the knee airbag connector to the SRS module. Check for short to ground or short to battery on the circuit if resistance is too low.
- Wiggle test: With ignition off and using safe procedures, inspect harness routing and perform gentle wiggle tests while monitoring continuity for intermittent faults (do not operate airbag).
- Module test/active test: If available, use the OEM scan tool to perform functional tests or outputs to verify the SRS module driver for the knee airbag. Follow manufacturer procedures.
- Repair/replace: Repair wiring/connectors as required. If squib resistance is out of spec, replace the passenger knee airbag module with correct OEM part. If wiring and airbag check good but fault persists, suspect SRS control module — verify with manufacturer diagnostic flow before replacement.
- Clear and verify: After repairs, clear DTCs with scan tool, reconnect battery, and cycle ignition. Confirm B0013 does not return and that the SRS lamp extinguishes. Re-scan to verify no additional related codes.
Likely causes
- Damaged or disconnected connector at passenger knee airbag
- Short to ground or short to battery in the knee airbag wiring
- Open circuit in harness to knee airbag
- High resistance at connector pins due to corrosion
- Failed passenger knee airbag squib
Fault status
Status
SRS control module detected a fault in the passenger knee airbag deployment control circuit (open/short/high resistance or communication/configuration error). SRS warning lamp likely illuminated; passenger knee airbag deployment may be disabled until repaired.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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Code
B0013
HUMMER
B — Body
Right Front/Passenger Frontal Deployment Loop Circuit
AI status
Completed
Completed
100%
Causes
- Open or short in passenger knee airbag squib circuit (wiring or connector)
- Corroded, loose or damaged connector at knee airbag or SRS control module
- Defective passenger knee airbag (squib)
- Faulty SRS (airbag) control module or internal driver circuit
- Improper repairs or aftermarket modifications affecting SRS wiring
- Intermittent harness damage from dash movement or impact
Symptoms
- SRS/airbag warning light illuminated on instrument panel
- Possible disablement of passenger airbag/knee airbag deployment
- Related SRS codes logged (other airbag or restraint system faults)
- Vehicle may fail safety inspection requiring SRS fault correction
What to check
- Confirm battery voltage is within nominal range before testing
- Check for other stored SRS codes and freeze frame data with a capable scan tool
- Visual inspection of knee airbag area, connectors and wiring harness for damage or corrosion
- Verify connector pins are straight and fully seated at knee airbag and SRS module
- Measure squib circuit resistance with OHM meter after disabling the battery and following manufacturer safety wait time
- Inspect dash area for evidence of prior repairs, aftermarket equipment or harness chafing
Signal parameters
- Expected squib resistance: typically low (approx. 0.5–5 ohms depending on vehicle) — consult manufacturer data
- Open circuit (OL/infinite) indicates broken wiring or disconnected squib
- Very low/near 0 ohms indicates short to ground or battery
- SRS control module may report deployment driver voltage or circuit current during active tests (requires OEM scan tool)
- Fault set when measured resistance or circuit behavior outside manufacturer defined thresholds
Diagnostic algorithm
- Safety first: Disable the negative battery terminal and wait the manufacturer-specified time (commonly 90 seconds or per service manual) before touching SRS components.
- Scan: Connect an SRS-capable scan tool. Read and record B0013 and any other stored/ pending SRS codes and freeze frame data.
- Visual: Inspect the passenger knee airbag module, connector, and wiring harness for damage, corrosion, pushed-out pins, or loose clips. Repair any obvious damage.
- Connector check: With battery still disconnected, disconnect the knee airbag connector and inspect/clean terminals. Reconnect firmly and re-check the code.
- Resistance test: Measure resistance across the knee airbag squib circuit at the connector and at the SRS module side (if accessible). Compare to manufacturer specification. Note: do not attempt resistance checks with battery connected.
- Continuity and short test: Check continuity from the knee airbag connector to the SRS module. Check for short to ground or short to battery on the circuit if resistance is too low.
- Wiggle test: With ignition off and using safe procedures, inspect harness routing and perform gentle wiggle tests while monitoring continuity for intermittent faults (do not operate airbag).
- Module test/active test: If available, use the OEM scan tool to perform functional tests or outputs to verify the SRS module driver for the knee airbag. Follow manufacturer procedures.
- Repair/replace: Repair wiring/connectors as required. If squib resistance is out of spec, replace the passenger knee airbag module with correct OEM part. If wiring and airbag check good but fault persists, suspect SRS control module — verify with manufacturer diagnostic flow before replacement.
- Clear and verify: After repairs, clear DTCs with scan tool, reconnect battery, and cycle ignition. Confirm B0013 does not return and that the SRS lamp extinguishes. Re-scan to verify no additional related codes.
Likely causes
- Damaged or disconnected connector at passenger knee airbag
- Short to ground or short to battery in the knee airbag wiring
- Open circuit in harness to knee airbag
- High resistance at connector pins due to corrosion
- Failed passenger knee airbag squib
Fault status
Status
SRS control module detected a fault in the passenger knee airbag deployment control circuit (open/short/high resistance or communication/configuration error). SRS warning lamp likely illuminated; passenger knee airbag deployment may be disabled until repaired.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
Repair manuals
Manual library for HUMMER
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