OBD Guide
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B11EC

Rear HVAC Blower Control Input Circuit Short

B11EC is an OBD-II diagnostic trouble code meaning: Rear HVAC Blower Control Input Circuit Short. Common causes: short circuit in wiring harness, rear fan malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Rear heater fan does not work
  • Overheating or burning smell in the cabin
  • Unstable operation of the climate control system

Causes

  • Short circuit in wiring harness
  • Rear fan malfunction
  • HVAC Control Module Problems
  • Oxidation or damage to contacts

How to Fix

  1. Check the integrity of the wiring harness leading to the rear fan
  2. Test the operation of the fan itself
  3. Check voltage at HVAC control module connectors
  4. Replace faulty components
  5. Clean or replace damaged contacts

Related codes

B11EBB11EDB11EE

FAQ

What does the B11EC code mean?

B11EC is an OBD-II diagnostic trouble code that indicates: Rear HVAC Blower Control Input Circuit Short

What causes a B11EC error code?

The most common causes of B11EC include: Short circuit in wiring harness; Rear fan malfunction; HVAC Control Module Problems; Oxidation or damage to contacts.

How do I fix a B11EC diagnostic trouble code?

To fix B11EC: Check the integrity of the wiring harness leading to the rear fan. Test the operation of the fan itself. Check voltage at HVAC control module connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B11EC?

Limited driving only, diagnose soon

How much does it cost to fix B11EC?

The estimated repair cost for B11EC is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat