P0AF4 Code - Drive Motor Inverter Temperature Sensor 'B' Circuit Low
Quick Answer
The HV control ECU uses a temperature sensor, which is built into the inverter, to detect the temperature of the motor inverter. Common causes include Faulty Inverter With Converter Assembly, Inverter With Converter Assembly harness is open or shorted, Inverter With Converter Assembly circuit poor electrical connection. 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
- P0AF4 indicates Drive Motor Inverter Temperature Sensor 'B' Circuit Low.
- Common causes
- Common causes include Faulty Inverter With Converter Assembly, Inverter With Converter Assembly harness is open or shorted, Inverter With Converter Assembly circuit poor electrical connection.
- 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 P0AF4 Description
The characteristic of the motor inverter temperature sensor is the same as the boost converter temperature sensor.
The HV control ECU limits the load based on the signals transmitted by the motor inverter temperature sensor, in order to check the effectiveness of the inverter cooling system and prevent the inverter from overheating. Furthermore, the HV control ECU detects a malfunction in the wiring of the motor inverter temperature sensor, as well as in the sensor itself.
What are the Possible Causes of the DTC P0AF4?
- Faulty Inverter With Converter Assembly
- Inverter With Converter Assembly harness is open or shorted
- Inverter With Converter Assembly circuit poor electrical connection
- Faulty HV Control ECU
How to Fix the DTC P0AF4?
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 P0AF4 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.
Need more information about the P0AF4 code?
Need more information on how to fix the P0AF4 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0AF4 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P0AF4 Lexus — Drive Motor Inverter Temperature Sensor 'B' Circuit Low
- P0AF4 Nissan — Drive Motor Inverter Temperature Sensor 'B' Circuit Low
- P0AF4 Toyota — Drive Motor Inverter Temperature Sensor 'B' Circuit Low
Frequently Asked Questions about P0AF4 Code
What does the OBDII code P0AF4 mean?
The P0AF4 code indicates a low voltage issue in the Drive Motor Inverter Temperature Sensor 'B' Circuit, which monitors the inverter's temperature to protect it from overheating.
What are the symptoms of the P0AF4 code?
Common symptoms include an illuminated Check Engine Light, reduced vehicle performance, overheating warnings, and potentially limited hybrid or EV functionality.
What causes the P0AF4 code to appear?
Possible causes include a faulty temperature sensor, damaged wiring or connectors, a malfunctioning inverter, or an issue with the vehicle's powertrain control module (PCM).
Can I drive with the P0AF4 code?
Driving with this code is not recommended, as it may lead to overheating and potential damage to the drive motor inverter or related components.
How is the P0AF4 code diagnosed?
A technician will use a scan tool to confirm the code, inspect the wiring and connectors, test the temperature sensor, and check for any related faults in the inverter or PCM.
What repairs can fix the P0AF4 code?
Repairs may include replacing the temperature sensor, repairing damaged wiring or connectors, updating or reprogramming the PCM, or replacing the drive motor inverter if necessary.
How much does it cost to fix the P0AF4 code?
Repair costs vary but typically range from $100 to $800 depending on whether the issue is with the sensor, wiring, or inverter.
What happens if I ignore the P0AF4 code?
Ignoring this code can lead to inverter overheating, reduced vehicle performance, and potentially expensive repairs to the powertrain or electrical system.
Can a dead battery cause the P0AF4 code?
While unlikely, a weak or failing high-voltage battery could indirectly affect the inverter's performance and should be tested as part of the diagnostic process.
Is the P0AF4 code specific to hybrid or electric vehicles?
Yes, this code primarily appears in hybrid and electric vehicles with drive motor inverters and advanced temperature monitoring systems.
Discuss the causes and fixes for P0AF4 OBDII Code
Code P0AF4 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
