OBD Guide
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B198A

All Door Secondary Unlock Control Circuit Low

B198A is an OBD-II diagnostic trouble code meaning: All Door Secondary Unlock Control Circuit Low. Common causes: open or short circuit in wiring harness, door control module malfunction. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Secondary door opening mechanisms do not work
  • Flashing or constant lighting of the door warning lamp
  • Problems with the central locking

Causes

  • Open or short circuit in wiring harness
  • Door control module malfunction
  • Poor contact in connectors
  • Contact corrosion
  • Faulty relay
  • Vehicle weight problems

How to Fix

  1. Check control circuit voltage
  2. Inspect the wiring harness for damage
  3. Check the condition of the contacts in the connectors
  4. Test the operation of the door control module
  5. Check the condition of the relays and fuses
  6. If necessary, replace faulty components

Related codes

B1981B1982B1983

FAQ

What does the B198A code mean?

B198A is an OBD-II diagnostic trouble code that indicates: All Door Secondary Unlock Control Circuit Low

What causes a B198A error code?

The most common causes of B198A include: Open or short circuit in wiring harness; Door control module malfunction; Poor contact in connectors; Contact corrosion.

How do I fix a B198A diagnostic trouble code?

To fix B198A: Check control circuit voltage. Inspect the wiring harness for damage. Check the condition of the contacts in the connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B198A?

Limited driving only, diagnose soon

How much does it cost to fix B198A?

The estimated repair cost for B198A is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat