OBD Guide
ENFRDEESPT

B177A

Roof Status Incorrect

B177A is an OBD-II diagnostic trouble code meaning: Roof Status Incorrect. Common causes: broken or damaged wiring harness (harness) of the side curtain, faulty curtain squib. Estimated repair cost: $56–222.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–222 (est.)

Symptoms

  • The airbag light is on
  • Lack of system response during diagnostics
  • Error message on the dashboard

Causes

  • Broken or damaged wiring harness (harness) of the side curtain
  • Faulty curtain squib
  • Problems with the SRS control unit
  • Corrosion or poor contact in connectors
  • Software glitch in the system

How to Fix

  1. Diagnose the SRS system using a scanner
  2. Check the integrity of the wiring harness and connectors
  3. Test the resistance of the curtain squib
  4. If necessary, replace damaged components
  5. Reset the error and check the system again

Related codes

B177BB177CB1780

FAQ

What does the B177A code mean?

B177A is an OBD-II diagnostic trouble code that indicates: Roof Status Incorrect

What causes a B177A error code?

The most common causes of B177A include: Broken or damaged wiring harness (harness) of the side curtain; Faulty curtain squib; Problems with the SRS control unit; Corrosion or poor contact in connectors.

How do I fix a B177A diagnostic trouble code?

To fix B177A: Diagnose the SRS system using a scanner. Check the integrity of the wiring harness and connectors. Test the resistance of the curtain squib. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B177A?

Do not drive — repair immediately

How much does it cost to fix B177A?

The estimated repair cost for B177A is $56–222. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat