01 Common Car Part Issues and How to Fix Them • 02 Experts Reveal Why Saying One Wrong Phrase At A Dealership … • 03 C0050 - Right Rear Wheel Speed Circuit Malfunction • 04 Transmission Troubleshooting: What Does It Mean When Your C… • 05 How to Calibrate Your Car’s Sensors After Repairs (ABS, TPM… • 06 10 Essential Legal Things Every Car Owner Should Know • 07 The Critical Engine Element That Secretly Pushes Your Fuel … • 08 This Is How to Fix Sensor-Related Fuel Consumption Problems… • 09 P0024 B camshaft position - timing over advanced or system … • 10 Step-by-Step: How to Safely Remove Paint from Car Windows P… •

DTC codes / B00xx · Airbags, seats, doors, lights and comfort systems / B0029

B0029Right Side Curtain Air Bag Deployment Control

B0029 indicates that the right side curtain air bag deployment control circuit has a fault, meaning the supplemental restraint system (SRS) control module has detected an abnormal condition in the wiring or component that triggers the right curtain air bag. The computer monitors circuit resistance and voltage and sets this code when the signal falls outside the expected range, which can prevent the air bag from deploying in a side impact.

SystemBody
Code typeGeneric (all makes)
SeverityHigh
Fix difficultyProfessional
AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

  • The air bag warning light on the instrument cluster stays illuminated.
  • A message such as 'Service Air Bag' or 'SRS Fault' may appear on the driver information center.
  • The right side curtain air bag may not deploy in a side impact or rollover event.
  • Often no symptoms besides the warning light, with the vehicle driving normally.
  • Other air bag-related systems, such as seat belt pretensioners, may be disabled if the fault affects shared circuits.

Common causes, most likely first

  1. Damaged or chafed wiring in the right curtain air bag circuit, often at the hinge pillar or roof rail where the harness flexes.
  2. A faulty right curtain air bag module or its internal squib, which can degrade over time or after a minor impact.
  3. Corroded or loose electrical connectors at the air bag module or the SRS control module.
  4. A defective clockspring or roll connector if the circuit routes through the steering column (less common for curtain air bags but possible on some designs).
  5. Water intrusion or accident damage that affects the right side body harness or the air bag module mounting area.
  6. A failed SRS control module that incorrectly sets the code despite a healthy circuit.
  7. Aftermarket accessories or previous repairs that tapped into the SRS wiring and altered resistance.

How to diagnose and fix it

  1. Inspect the right side curtain air bag wiring and connectors for visible damage, corrosion, or loose pins, starting at the module and following the harness to the SRS control module.
  2. Check for technical service bulletins (TSBs) or recalls related to the right curtain air bag circuit for the specific vehicle, as some models have known harness routing issues.
  3. Measure the resistance of the right curtain air bag squib circuit with a digital multimeter and compare to the manufacturer's specification, usually 1.5 to 3.0 ohms.
  4. Perform a wiggle test on the harness while monitoring the air bag circuit resistance or the scan tool data to reveal intermittent faults.
  5. If resistance is out of range, disconnect the air bag module and check the circuit resistance again to isolate whether the fault is in the module or the wiring.
  6. Repair or replace the faulty wiring, connector, or air bag module as needed, following the manufacturer's service procedure and using proper safety precautions.
  7. Clear the diagnostic trouble codes and verify the repair by cycling the ignition and confirming the air bag light goes out and the code does not return.

Before you replace the curtain air bag

  • A common cause of B0029 is a chafed wire in the roof rail area where the harness rubs against the body during normal driving, which can be missed if only the module connector is inspected.
  • The code does not always mean the air bag module itself is faulty; resistance faults are frequently caused by poor connector terminal tension or corrosion that can be fixed without replacing the module.
  • Some vehicles set this code after a low-voltage event or a dead battery, and the code may clear after charging the battery and performing a steering angle sensor calibration, so always check battery health first.
  • If the vehicle has been in a flood or has a water leak, the right side harness connectors can corrode internally and set this code even though the air bag module tests good.
  • After any repair, the SRS control module may require a scan tool to clear crash data or perform a learn procedure, and simply disconnecting the battery will not reset a latched air bag code.

Can I keep driving with B0029?

Because the right side curtain air bag may not deploy in a side impact or rollover, the vehicle is not safe to drive until the fault is repaired. Avoid carrying passengers on the right side and have the system diagnosed by a qualified technician as soon as possible.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage