OBD Guide
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B1777

Drivers Seatbelt Tension Reducer Circuit Short to Ground

B1777 is an OBD-II diagnostic trouble code meaning: Drivers Seatbelt Tension Reducer Circuit Short to Ground. Common causes: wiring harness damage, seat belt pretensioner malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Airbag light is on
  • The passive safety system may not work in an accident.
  • Error B1777 is stored in the ECU memory

Causes

  • Wiring harness damage
  • Seat belt pretensioner malfunction
  • Short circuit to ground in the circuit
  • Problems with connecting connectors

How to Fix

  1. Check wiring harness for damage
  2. Check the integrity of the pretensioner chain
  3. Check the connections of the connectors
  4. Replace seat belt pretensioner if necessary
  5. Reset the error and check the system

Related codes

B1778B1779B1780

FAQ

What does the B1777 code mean?

B1777 is an OBD-II diagnostic trouble code that indicates: Drivers Seatbelt Tension Reducer Circuit Short to Ground

What causes a B1777 error code?

The most common causes of B1777 include: Wiring harness damage; Seat belt pretensioner malfunction; Short circuit to ground in the circuit; Problems with connecting connectors.

How do I fix a B1777 diagnostic trouble code?

To fix B1777: Check wiring harness for damage. Check the integrity of the pretensioner chain. Check the connections of the connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1777?

Do not drive — repair immediately

How much does it cost to fix B1777?

The estimated repair cost for B1777 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat