B0062 high Severity

B0062: Left roof rail/curtain airbag deployment loop circuit fault (open/high resistance)

Airbag/SRS warning light illuminated; potential left side curtain airbag may not deploy in a collision

Overview

DTC B0062 indicates an open or high resistance condition in the left roof rail or head curtain airbag deployment loop circuit, typically associated with wiring, connector, or module faults in the Supplemental Restraint System (SRS).

Common Symptoms

  • Airbag/SRS warning light on dashboard
  • Diagnostic tool shows B0062
  • Possible "Service Airbag" message in info display

Most Common Causes

Open circuit or high resistance in left roof rail airbag deployment loop wiring high

Open/high resistance conditions (e.g., >6 ohms) trigger this DTC in GM vehicles per OEM service data

Corroded or poor electrical connection in airbag harness/connectors medium

Connector corrosion can increase resistance in deployment loop

Faulty left roof rail/curtain airbag module medium

Internal module fault can cause open loop condition

Faulty Airbag Control Module (SDM/ACM) low

Less common; module diagnostics required

Diagnostic Steps

  1. Connect a diagnostic scan tool and confirm code B0062; check for related SRS codes
    Expected: B0062 present; possibly other SRS loop codes
    Interpretation: Confirms airbag circuit fault
  2. Visually inspect left roof rail/curtain airbag wiring and connectors for damage/corrosion
    Expected: No frays, breaks, or corrosion visible
    Interpretation: Damage found indicates harness repair
  3. Measure resistance on left roof rail deployment loop wiring with multimeter
    Expected: Resistance value within vehicle-specific specification (typically low)
    Interpretation: High or open resistance confirms wiring/connector or module circuit fault
  4. Check voltage supply to circuit and inspect SDM/ACM outputs
    Expected: Proper voltage present
    Interpretation: Incorrect voltage may indicate control module issue
  5. Clear code and re‑test after repairs
    Expected: Code does not return
    Interpretation: Successful repair

Repair Solutions

Repair or replace damaged wiring/connector in left roof rail airbag loop medium
Estimated Cost: $100 - $400

Cost varies by vehicle access and extent of wiring harness damage

Replace left roof rail/curtain airbag module if internal fault confirmed hard
Estimated Cost: $300 - $1000

Airbag module replacement often requires calibration or SDM reset

Clean or replace corroded connectors easy
Estimated Cost: $20 - $100

Connector cleaning may temporarily fix high resistance issues

Replace/repair SDM/ACM if control module fault hard
Estimated Cost: $500 - $1500

Control module replacement often requires professional programming

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Incorrectly diagnosing as generic body code without recognizing airbag deployment loop specifics
  • Misinterpreting related SRS codes (e.g. B0061/B0064) as B0062

Frequently Asked Questions

Can you explain the meaning of B0062?

The B0062 code stands for Left roof rail/curtain airbag deployment loop circuit fault (open/high resistance). This generally indicates an issue with the Sensors system.

Should I stop driving if I have B0062?

With a severity level of high, airbag/SRS warning light illuminated; potential left side curtain airbag may not deploy in a collision

Common signs of the B0062 error code

The most typical signs are: Airbag/SRS warning light on dashboard, Diagnostic tool shows B0062, Possible "Service Airbag" message in info display.

Why is my car throwing a B0062 code?

This code is frequently triggered by: Open circuit or high resistance in left roof rail airbag deployment loop wiring, Corroded or poor electrical connection in airbag harness/connectors, Faulty left roof rail/curtain airbag module.

What is the price difference for fixing B0062?

Expect to pay around $100 if the issue is a Clean or replace corroded connectors, but up to $1500 if the Replace/repair SDM/ACM if control module fault needs replacement.

Is the B0062 code specific to Mercedes?

Yes, B0062 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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