OBD Guide
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B198B

All Door Secondary Unlock Control Circuit High

B198B is an OBD-II diagnostic trouble code meaning: All Door Secondary Unlock Control Circuit High. Common causes: short circuit to +12v in the wiring harness, broken or damaged wires. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Secondary unlocking of all doors does not work
  • Doors can only unlock once
  • Central locking glitches

Causes

  • Short circuit to +12V in the wiring harness
  • Broken or damaged wires
  • Malfunction of door unlock solenoids
  • Body Control Module (BCM) Problems

How to Fix

  1. Check wiring harness for damage
  2. Ring the door unlock chain
  3. Check voltage at BCM terminals
  4. Replace faulty solenoids or BCM as necessary

Related codes

B198AB198C

FAQ

What does the B198B code mean?

B198B is an OBD-II diagnostic trouble code that indicates: All Door Secondary Unlock Control Circuit High

What causes a B198B error code?

The most common causes of B198B include: Short circuit to +12V in the wiring harness; Broken or damaged wires; Malfunction of door unlock solenoids; Body Control Module (BCM) Problems.

How do I fix a B198B diagnostic trouble code?

To fix B198B: Check wiring harness for damage. Ring the door unlock chain. Check voltage at BCM terminals. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B198B?

Yes, but get it checked soon

How much does it cost to fix B198B?

The estimated repair cost for B198B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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