What Does P0AF6 Mean?
The motor controller has detected intermittent or erratic signal behavior from drive motor inverter temperature sensor B. The readings are fluctuating unexpectedly, showing rapid changes that do not match actual thermal conditions. Like most intermittent electrical faults, this is typically caused by connection issues that manifest under specific vibration frequencies, temperature ranges, or mechanical loads.
Common Causes
35%
Loose or corroded connector pins at sensor B or motor controller
25%
Partially damaged wire with intermittent break at a flex point
20%
Cracked solder joint on sensor B or motor controller circuit board
15%
Degrading NTC thermistor with unstable characteristics
5%
EMI coupling from high-current inverter switching onto the sensor signal
Diagnostic Steps
1
Data-log sensor B at the highest sample rate during a varied drive cycle. Identify the conditions (speed, load, road surface) that trigger the erratic readings.
2
Perform a physical wiggle test on the sensor connector, harness, and motor controller connector while monitoring the live data. Note any correlation between physical manipulation and signal disturbance.
3
Inspect connector pins for oxidation, reduced tension, or terminal damage. Clean with contact cleaner and verify retention force. Apply dielectric grease before reconnecting.
4
Trace the harness and look for chafing, tight bends, or areas where the wire could be intermittently making contact with vibrating components. Repair or re-route as needed.
5
If the fault cannot be isolated to a specific connection, replace the sensor and its connector pigtail as an assembly. Re-test with a drive cycle that previously triggered the fault.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The motor controller has detected intermittent or erratic signal behavior from drive motor inverter temperature sensor B. The readings are fluctuating unexpectedly, showing rapid changes that do not match actual thermal conditions. Like most intermittent electrical faults, this is typically caused b...
The most common cause of P0AF6 (Intermittent/Erratic) is: Loose or corroded connector pins at sensor B or motor controller
Typical repair costs for P0AF6 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent temperature spikes in the sensor data can cause sudden and unexpected power reductions while driving. This is particularly concerning during highway merging or passing maneuvers. The vehicle remains safe to drive at moderate loads, but repair is recommended before the intermittent fault becomes a permanent failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0AF6 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Hybrid/EV Drive Motor & Inverter
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
