B0021 CHEVROLET Possible Causes

• Faulty passenger seat side airbag
• Passenger seat side airbag harness is open or shorted
• Poor electrical connection in passenger seat side airbag circuit
• Faulty Sensing and Diagnostic Module (SDM)

How to Fix B0021 CHEVROLET Code?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

DTC B0021 0E: Passenger seat side airbag deployment loop resistance below threshold

Possible Symptoms

• Airbag warning light illuminated

B0021 CHEVROLET Meaning

If a malfunction is detected, a Diagnostic Trouble Code (DTC) will be stored in non-volatile memory. During a side or frontal collision of sufficient force, the Inflatable Restraint Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop to deploy the passenger seat side airbag. The SDM performs continuous diagnostic tests on the deployment loops to verify proper circuit continuity and shorts to ground or voltage. A shorting bar is used in the passenger seat side airbag connector that will short the high and low circuits when the connector is disconnected. This helps prevent unwanted airbag deployment during service.

B0021 FORD Possible Causes

• Faulty driver side air curtain
• Driver side air curtain harness is open or shorted
• Poor electrical connection in driver side air curtain circuit

How to Fix B0021 FORD Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

If the Restraint Control Module (RCM) detects a short circuit between the driver side air curtain circuits and the circuits of another SRS component, it sets this Diagnostic Trouble Code (DTC) and the corresponding SRS component DTC.

Possible Symptoms

• Airbag warning light illuminated

B0021 FORD Meaning

The Restraint Control Module (RCM) monitors all deployable device and sensor circuits for a coupled signal (short) between circuits. If the RCM detects a short circuit between the circuits of one device and another device, it will store a DTC for each of the signal cross-coupling faults in memory. The RCM sends a message to the instrument panel (IPC) to illuminate the airbag warning indicator. When a normal loop fault is present (a loop is either shorted to battery/ground, or open circuit or low resistance), then the signal cross-coupling diagnostics will not be active. Once the normal loop fault is repaired, the signal cross-coupling diagnostic resumes.

B0021 GMC Possible Causes

• Faulty passenger seat side airbag
• Passenger seat side airbag harness is open or short-circuited
• Poor electrical connection in the passenger seat side airbag circuit
• Faulty Sensing and Diagnostic Module (SDM)

How is B0021 GMC Code Repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

DTC B0021 01: Passenger seat side airbag deployment loop short to battery

DTC B0021 02: Passenger seat side airbag deployment loop short to ground

DTC B0021 04: Passenger seat side airbag deployment loop open circuit

DTC B0021 0D: Passenger seat side airbag deployment loop resistance above threshold
DTC B0021 0E: Passenger seat side airbag deployment loop resistance below threshold

Possible Symptoms

• Airbag warning light illuminated

B0021 GMC Meaning

If a malfunction is detected, a Diagnostic Trouble Code (DTC) will be stored in non-volatile memory. During a side or frontal collision of sufficient force, the Inflatable Restraint Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop to deploy the passenger seat side airbag. The SDM performs continuous diagnostic tests on the deployment loops to verify proper circuit continuity and shorts to ground or voltage. A shorting bar is used in the passenger seat side airbag connector that will short the high and low circuits when the connector is disconnected. This helps prevent unwanted airbag deployment during maintenance.

B0021 LINCOLN Possible Causes

• Faulty driver side air curtain
• Driver side air curtain harness is open or shorted
• Poor electrical connection in driver side air curtain circuit

How to Fix B0021 LINCOLN Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed, or corroded connector pins.

When is the Code Detected?

If the Restraint Control Module (RCM) detects a short circuit between the driver side air curtain circuits and the circuits of another SRS component, it sets this Diagnostic Trouble Code (DTC) and the corresponding SRS component DTC.

Possible Symptoms

• Airbag warning light illuminated

B0021 LINCOLN Meaning

The Restraint Control Module (RCM) monitors all deployable device and sensor circuits for a coupled signal (short) between circuits. If the RCM detects a short circuit between the circuits of one device and another device, it will store a DTC for each of the signal cross-coupling faults in memory. The RCM sends a message to the instrument panel (IPC) to illuminate the airbag warning light. When a normal loop fault is present (a loop is either shorted to battery/ground, or open circuit or low resistance), then the signal cross-coupling diagnostics will not be active. Once the normal loop fault is repaired, the signal cross-coupling diagnostic resumes.

B0021 MERCURY Possible Causes

• Faulty driver side air curtain
• Driver side air curtain harness is open or shorted
• Poor electrical connection in driver side air curtain circuit

How to Fix B0021 MERCURY Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

If the Restraint Control Module (RCM) detects a short circuit between the driver side air curtain circuits and the circuits of another SRS component, it sets this Diagnostic Trouble Code (DTC) and the corresponding SRS component DTC.

Possible Symptoms

• Airbag warning light illuminated

B0021 MERCURY Meaning

The Restraint Control Module (RCM) monitors all deployable device and sensor circuits for a coupled signal (short) between circuits. If the RCM detects a short circuit between the circuits of one device and another device, it will store a DTC for each of the signal cross-coupling faults in memory. The RCM sends a message to the instrument panel (IPC) to illuminate the airbag warning indicator. When a normal loop fault is present (a loop is either shorted to battery/ground, or open circuit or low resistance), then the signal cross-coupling diagnostics will not be active. Once the normal loop fault is repaired, the signal cross-coupling diagnostic resumes.

B0021 PONTIAC Possible Causes

• Faulty passenger seat side airbag
• Passenger seat side airbag harness is open or shorted
• Poor electrical connection in the passenger seat side airbag circuit
• Faulty Sensing and Diagnostic Module (SDM)

How to Fix B0021 PONTIAC Code?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

DTC B0021 0E: Passenger seat side airbag deployment loop resistance below threshold

Possible Symptoms

• Airbag warning light illuminated

B0021 PONTIAC Meaning

If a malfunction is detected, a Diagnostic Trouble Code (DTC) will be stored in non-volatile memory. During a side or frontal collision of sufficient force, the Inflatable Restraint Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop to deploy the passenger seat side airbag. The SDM performs continuous diagnostic tests on the deployment loops to verify proper circuit continuity and shorts to ground or voltage. A shorting bar is used in the passenger seat side airbag connector that will short the high and low circuits when the connector is disconnected. This helps prevent unwanted airbag deployment during service.

B0021 SATURN Possible Causes

• Faulty passenger seat side airbag
• Passenger seat side airbag harness is open or short-circuited
• Poor electrical connection of the passenger seat side airbag circuit
• Faulty Sensing and Diagnostic Module (SDM)

How to Fix B0021 SATURN Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

DTC B0021 0E: Passenger seat side airbag deployment loop resistance below threshold

Possible Symptoms

• Airbag warning light on

B0021 SATURN Meaning

If a malfunction is detected, a Diagnostic Trouble Code (DTC) will be stored in non-volatile memory. During a side or frontal collision of sufficient force, the Inflatable Restraint Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop to deploy the passenger seat side airbag. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and shorts to ground or voltage. A shorting bar is used in the passenger seat side airbag connector that will short the high and low circuits when the connector is disconnected. This will help prevent unwanted airbag deployment during maintenance.

B0022 Possible Causes

• Faulty clockspring coil
• Clockspring coil wiring harness is open or shorted
• Poor electrical connection in the clockspring coil circuit
• Faulty clockspring

How to Fix Code B0022?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Airbag warning light illuminated

B0022 Meaning

The driver deployment loop consists of the following:
– A dual-stage inflatable restraint steering wheel module
– The steering wheel inflatable restraint module coil
– The high circuits of the steering wheel module for both stages 1 and 2
– The low circuits of the steering wheel module for both stages 1 and 2
There are 2 shorting bars used in the steering wheel module coil connector. These shorting bars short together both stages of the steering wheel module high circuit and the steering wheel module low circuit when the connector is disconnected. This helps prevent unwanted deployment of the inflator module during servicing. During a frontal collision of sufficient force, the Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop. This current flow will deploy the steering wheel module. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory.

B0022 BUICK Possible Causes

• Faulty clockspring coil
• Clockspring coil wiring harness is open or shorted
• Poor electrical connection in the clockspring coil circuit
• Faulty clockspring

How to Fix B0022 BUICK Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Airbag warning light on

B0022 BUICK Meaning

The driver deployment loop consists of the following:
– A dual-stage inflatable restraint steering wheel module
– The steering wheel inflatable restraint module coil
– The steering wheel module high circuits for both stage 1 and 2
– The steering wheel module low circuits for both stage 1 and 2
There are 2 shorting bars used in the steering wheel module coil connector. These shorting bars short together both stages of the steering wheel module high circuit and the steering wheel module low circuit when the connector is disconnected. This helps prevent unwanted deployment of the inflator module during service. During a frontal collision of sufficient force, the Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop. This current flow will deploy the steering wheel module. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory.

B0022 CADILLAC Possible Causes

• Faulty clockspring coil
• Clockspring coil wiring harness is open or shorted
• Poor electrical connection in the clockspring coil circuit
• Faulty clockspring

How to Fix B0022 CADILLAC Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

 

 

Possible Symptoms

• Airbag warning light illuminated

 

B0022 CADILLAC Meaning

The driver deployment loop consists of the following:
– A dual-stage inflatable restraint steering wheel module
– The steering wheel inflatable restraint module coil
– The high circuits of the steering wheel module for both stage 1 and 2
– The low circuits of the steering wheel module for both stage 1 and 2
There are 2 shorting bars used in the steering wheel module coil connector. These shorting bars short together both stages of the steering wheel module high circuit and the steering wheel module low circuit when the connector is disconnected. This helps prevent unwanted deployment of the inflator module during service. During a frontal collision of sufficient force, the Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop. This current flow will deploy the steering wheel module. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory.