OBD Guide
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B2992

Open In The Thermal Protector Circuit

B2992 is an OBD-II diagnostic trouble code meaning: Open In The Thermal Protector Circuit. Common causes: broken wires in the passive safety system harness, oxidation or poor contact in connectors. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–111 (est.)

Symptoms

  • Airbag light is on
  • Restraint system inactive
  • Error B2992 in diagnostic scanner

Causes

  • Broken wires in the passive safety system harness
  • Oxidation or poor contact in connectors
  • Thermal fuse malfunction
  • Damage to the airbag control unit

How to Fix

  1. Perform a visual inspection of the passive restraint system wiring harness.
  2. Check the contacts in the connectors for oxidation or damage
  3. Measure the resistance of the thermal protection circuit
  4. If necessary, replace the thermal fuse or damaged wires
  5. Reset the error and check the system

Related codes

B2991B2993B1000

FAQ

What does the B2992 code mean?

B2992 is an OBD-II diagnostic trouble code that indicates: Open In The Thermal Protector Circuit

What causes a B2992 error code?

The most common causes of B2992 include: Broken wires in the passive safety system harness; Oxidation or poor contact in connectors; Thermal fuse malfunction; Damage to the airbag control unit.

How do I fix a B2992 diagnostic trouble code?

To fix B2992: Perform a visual inspection of the passive restraint system wiring harness.. Check the contacts in the connectors for oxidation or damage. Measure the resistance of the thermal protection circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2992?

Do not drive — repair immediately

How much does it cost to fix B2992?

The estimated repair cost for B2992 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat