Faulty passenger seat belt pretensioner connector or wiring; Open or shorted pretensioner squib (the pyrotechnic element); Damaged clock spring or wiring harness in the passenger seat area; Corrosion or water intrusion in the pretensioner circuit; Failed SRS control module (less common); Aftermarket accessories or seat covers interfering with wiring

DTC codes / B00xx · Airbags, seats, doors, lights and comfort systems / B0053

B0053Passenger Pretensioner Deployment Control

Q: What does code B0053 mean?

Passenger Pretensioner Deployment Control. B0053 indicates that the supplemental restraint system (SRS) control module has detected a fault in the passenger-side seat belt pretensioner deployment circuit, which is the pyrotechnic device that tightens the belt during a crash. The computer monitors the circuit's resistance and continuity and sets this code when the signal falls outside the expected range, often due to an open circuit, short, or high resistance.

B0053 indicates that the supplemental restraint system (SRS) control module has detected a fault in the passenger-side seat belt pretensioner deployment circuit, which is the pyrotechnic device that tightens the belt during a crash. The computer monitors the circuit's resistance and continuity and sets this code when the signal falls outside the expected range, often due to an open circuit, short, or high resistance.

SystemBody

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

SRS warning light illuminated on the dashboard
Often no symptoms besides the warning light
Passenger seat belt may not retract or lock as designed
Passenger airbag may be disabled as a fail-safe
In some vehicles, a chime or message indicating a restraint system fault

Common causes, most likely first

Faulty passenger seat belt pretensioner connector or wiring
Open or shorted pretensioner squib (the pyrotechnic element)
Damaged clock spring or wiring harness in the passenger seat area
Corrosion or water intrusion in the pretensioner circuit
Failed SRS control module (less common)
Aftermarket accessories or seat covers interfering with wiring

How to diagnose and fix it

Inspect the passenger seat belt pretensioner connector for looseness, corrosion, or damage
Check the pretensioner wiring harness for cuts, chafing, or pinched wires
Measure the resistance of the pretensioner squib with a multimeter and compare to specification
Disconnect the battery and wait for the backup power to drain before working on SRS components
Replace the passenger seat belt pretensioner if resistance is out of range
Clear the code and verify the repair with a scan tool
If the code persists, diagnose the SRS control module and its connections

What Most Techs Overlook on B0053

A common mistake is replacing the pretensioner without first checking the connector and wiring, which are frequent failure points due to seat movement.
The code can be set by a low battery or voltage spike, so always verify battery health and clear the code before condemning parts.
Aftermarket seat covers or objects under the passenger seat can damage the pretensioner wiring, leading to this code.
The SRS module may store this code intermittently; always check for history codes and perform a wiggle test on the harness.
Replacing the pretensioner requires disconnecting the battery and following safety procedures to avoid accidental deployment.

Can I keep driving with B0053?

Do not drive with an active B0053 code because the passenger pretensioner may not deploy in a crash, increasing injury risk. Have the vehicle inspected and repaired by a qualified technician before driving, and avoid using the passenger seat until fixed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.