PTC Heater Overheat Protect
Table of contents
B2771 NISSAN Possible Causes
- Faulty Positive Temperature Coefficient (PTC) Heater
- PTC Heater harness is open or shorted
- PTC Heater circuit poor electrical connection
How do I fix code B2771 NISSAN?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B2771 NISSAN code
The cost of diagnosing the B2771 NISSAN code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B2771 NISSAN Description
A Positive Temperature Coefficient (PTC) heater is used as the heat source for heating. The PTC is a ceramic material with barium titanate as the primary component. The PTC heater provides an internal control circuit and performs LIN communication with A/C Auto Amplifier. Based on the signals from A/C Auto Amplifier, the microcomputer inside PTC heater controls the heater output by PWM. When current is applied, it heats up. Upon reaching a certain temperature (Curie temperature) the resistance suddenly increases, limiting the current, and maintaining a constant amount of heating. The Diagnostic Trouble Code (DTC) sets when the PTC heater circuit board internal temperature is 115°C (239°F) or more.