B272B Code - Passenger Back Over-Temp Detected
Quick Answer
The Seat Control Module E (SCME) monitors seat backrest temperature while it supplies voltage and ground to both blower motors. Common causes include Restricted Passenger Seat Backrest Blower Motor Filter, Faulty Passenger Seat Backrest Blower Motor, Passenger Seat Backrest Blower Motor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B272B indicates Passenger Back Over-Temp Detected.
- Common causes
- Common causes include Restricted Passenger Seat Backrest Blower Motor Filter, Faulty Passenger Seat Backrest Blower Motor, Passenger Seat Backrest Blower Motor harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B272B Description
If the passenger seat backrest blower motor temperature exceeds 70 ° C (158 ° F) in cool mode or 85 ° C (185 ° F) in heat mode for more than 4 seconds the SCME shuts down the passenger seat system and sets this Diagnostic Trouble Code (DTC).
What are the Possible Causes of the DTC B272B?
- Restricted Passenger Seat Backrest Blower Motor Filter
- Faulty Passenger Seat Backrest Blower Motor
- Passenger Seat Backrest Blower Motor harness is open or shorted
- Passenger Seat Backrest Blower Motor circuit poor electrical connection
- Faulty Seat Control Module E (SCME)
How to Fix the DTC B272B?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B272B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- B272B Ford — Passenger Back Over-Temp Detected
- B272B Infiniti — Front Sonar Sensor Right Inner
- B272B Lincoln — Passenger Back Over-Temp Detected
- B272B Mercury — Passenger Back Over-Temp Detected
- B272B Nissan — Front Sonar Sensor Right Inner
Frequently Asked Questions about B272B Code
1. What does OBDII code B272B mean?
Code B272B indicates that the vehicle's system has detected an over-temperature condition in the passenger seat's heating element.
2. What are the common symptoms of code B272B?
Common symptoms include the passenger seat heater not functioning, the seat heater turning off shortly after activation, or the heating system displaying a warning light.
3. What causes the B272B code to appear?
The code is typically caused by a malfunction in the seat heating element, a faulty temperature sensor, a wiring issue, or a problem with the seat heater control module.
4. Can I still use my vehicle with a B272B code?
Yes, the vehicle remains drivable, but the passenger seat heater may not work properly, posing a comfort issue rather than a safety concern.
5. How is the B272B code diagnosed?
A technician will use a scan tool to confirm the code, inspect the seat heater circuitry, check for damaged wiring, and test the heating element and temperature sensor for proper operation.
6. How do you fix the B272B code?
Repairs may involve replacing the seat heating element, repairing damaged wiring, replacing a faulty temperature sensor, or recalibrating or replacing the heater control module.
7. Can I fix the B272B code myself?
If you're experienced with automotive wiring and diagnostics, you might be able to inspect and repair the issue. However, professional assistance is recommended for accurate diagnosis and repair.
8. How much does it cost to fix the B272B code?
Repair costs vary depending on the root cause, ranging from $100 for minor wiring repairs to $500 or more if the seat heating element or control module needs replacement.
9. Will clearing the B272B code fix the issue?
Clearing the code without addressing the underlying problem will only temporarily erase the error. The code will reappear if the issue persists.
10. Can extreme weather cause the B272B code?
While unlikely, extreme cold or heat could exacerbate existing issues in the seat heating system, potentially triggering the code.
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