OBD Guide
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B2771

PTC Heater Overheat Protect

B2771 is an OBD-II diagnostic trouble code meaning: PTC Heater Overheat Protect. Common causes: ptc heater malfunction, problems with the wiring harness or connectors. Estimated repair cost: $56–167.

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

Symptoms

  • Lack of warm air supply to the cabin
  • Triggering of the protection system (heater shutdown)
  • Dashboard warning

Causes

  • PTC heater malfunction
  • Problems with the wiring harness or connectors
  • Control module malfunction
  • Contamination or insufficient air flow through the heater

How to Fix

  1. Check the resistance and power supply of the PTC heater
  2. Inspect the wiring harness and connectors for damage.
  3. Check the operation of the control module
  4. Clean the heater and air ducts if necessary
  5. Replace faulty PTC heater

Related codes

B2770B2772

FAQ

What does the B2771 code mean?

B2771 is an OBD-II diagnostic trouble code that indicates: PTC Heater Overheat Protect

What causes a B2771 error code?

The most common causes of B2771 include: PTC heater malfunction; Problems with the wiring harness or connectors; Control module malfunction; Contamination or insufficient air flow through the heater.

How do I fix a B2771 diagnostic trouble code?

To fix B2771: Check the resistance and power supply of the PTC heater. Inspect the wiring harness and connectors for damage.. Check the operation of the control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2771?

Limited driving only, diagnose soon

How much does it cost to fix B2771?

The estimated repair cost for B2771 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat