OBD Guide
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B18BB

Window Control Circuit Low

B18BB is an OBD-II diagnostic trouble code meaning: Window Control Circuit Low. Common causes: open or short circuit in wiring harness, power window relay malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Power windows don't work
  • Intermittent operation of power windows
  • Window regulators are slow

Causes

  • Open or short circuit in wiring harness
  • Power window relay malfunction
  • Problems with the control unit
  • Window motor malfunction
  • Blown fuse

How to Fix

  1. Check fuses associated with power windows
  2. Check the integrity of the wiring harness
  3. Check power window relay
  4. Check the operation of the window lift motor
  5. Check the control unit for errors

Related codes

B18BAB18BCB18BD

FAQ

What does the B18BB code mean?

B18BB is an OBD-II diagnostic trouble code that indicates: Window Control Circuit Low

What causes a B18BB error code?

The most common causes of B18BB include: Open or short circuit in wiring harness; Power window relay malfunction; Problems with the control unit; Window motor malfunction.

How do I fix a B18BB diagnostic trouble code?

To fix B18BB: Check fuses associated with power windows. Check the integrity of the wiring harness. Check power window relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B18BB?

Limited driving only, diagnose soon

How much does it cost to fix B18BB?

The estimated repair cost for B18BB is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat