OBD Guide
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B11C4

Front Mode Door 1 Travel Range Too Large

B11C4 is an OBD-II diagnostic trouble code meaning: Front Mode Door 1 Travel Range Too Large. Common causes: damper mechanism jammed, worn guides or levers. Estimated repair cost: $56–167.

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

Symptoms

  • Incorrect airflow distribution
  • Clicking or grinding noises when the climate control operates
  • The damper does not move to its extreme positions

Causes

  • Damper mechanism jammed
  • Worn guides or levers
  • Problems with the throttle position sensor
  • Open or short circuit in wiring harness
  • HVAC control unit malfunction

How to Fix

  1. Diagnostics of the climate control system
  2. Checking the damper mechanism for jams
  3. Position sensor testing
  4. Checking the integrity of the wiring harness
  5. Calibrate or replace the HVAC control unit if necessary

Related codes

B11C5B11C3

FAQ

What does the B11C4 code mean?

B11C4 is an OBD-II diagnostic trouble code that indicates: Front Mode Door 1 Travel Range Too Large

What causes a B11C4 error code?

The most common causes of B11C4 include: Damper mechanism jammed; Worn guides or levers; Problems with the throttle position sensor; Open or short circuit in wiring harness.

How do I fix a B11C4 diagnostic trouble code?

To fix B11C4: Diagnostics of the climate control system. Checking the damper mechanism for jams. Position sensor testing. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B11C4?

Do not drive — repair immediately

How much does it cost to fix B11C4?

The estimated repair cost for B11C4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat