B2778
Passenger Side Curtain Air Bag Module Circuit Resistance High
B2778 is an OBD-II diagnostic trouble code meaning: Passenger Side Curtain Air Bag Module Circuit Resistance High. Common causes: damage to the side curtain module wiring harness, oxidation or poor contact in connectors. Estimated repair cost: $56–167.
Symptoms
- The Security System (SRS) indicator light is on.
- Passenger side curtain airbag does not deploy during testing
- Error message on the on-board computer display
Causes
- Damage to the side curtain module wiring harness
- Oxidation or poor contact in connectors
- Side curtain airbag module malfunction
- Damage to the side curtain squib
- Problems with the SRS control unit
How to Fix
- Diagnose the SRS system using a scanner
- Check the integrity of the wiring harness to the side curtain module
- Inspect and clean the contacts in the connectors
- Check side curtain module resistance
- Replace the side curtain module or wiring harness if necessary.
- Reset the error and check the system operation
Related codes
FAQ
What does the B2778 code mean?
B2778 is an OBD-II diagnostic trouble code that indicates: Passenger Side Curtain Air Bag Module Circuit Resistance High
What causes a B2778 error code?
The most common causes of B2778 include: Damage to the side curtain module wiring harness; Oxidation or poor contact in connectors; Side curtain airbag module malfunction; Damage to the side curtain squib.
How do I fix a B2778 diagnostic trouble code?
To fix B2778: Diagnose the SRS system using a scanner. Check the integrity of the wiring harness to the side curtain module. Inspect and clean the contacts in the connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B2778?
Do not drive — repair immediately
How much does it cost to fix B2778?
The estimated repair cost for B2778 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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