What Does P06AE Mean?
The PCM/ECM/TCM internal temperature sensor "B" circuit is reporting a voltage higher than the expected maximum threshold. This typically means the sensor signal line is open or shorted to the power supply voltage inside the control module. The driver may notice a check engine light, potential limp mode, or erratic powertrain behavior as the PCM cannot accurately monitor its own operating temperature.
Common Causes
45%
Internal PCM/ECM circuit failure with an open sensor signal line reading as maximum voltage
25%
PCM connector terminal damage or pin-fit issue causing an open circuit on the sensor line
15%
Internal short to the 5V reference circuit within the PCM raising the sensor voltage
10%
Intermittent power supply overvoltage condition affecting internal sensor readings
5%
Firmware corruption causing incorrect interpretation of sensor voltage
Diagnostic Steps
1
Review freeze frame data to identify the operating conditions when the code was set, paying attention to ambient temperature and engine load.
2
Monitor the internal temperature sensor B PID in real time — a reading pegged at maximum (e.g., 150°C or 5V) confirms an open or short-to-power condition.
3
Inspect the PCM connector for backed-out pins, corrosion, or physical damage that could cause an open circuit on internal signal lines.
4
Check the charging system output — verify alternator voltage stays between 13.5V and 14.7V with no AC ripple exceeding 50mV.
5
Attempt a PCM reflash with the latest manufacturer calibration; if the code persists, the internal temperature sensor has failed and PCM replacement is necessary.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The PCM/ECM/TCM internal temperature sensor "B" circuit is reporting a voltage higher than the expected maximum threshold. This typically means the sensor signal line is open or shorted to the power supply voltage inside the control module. The driver may notice a check engine light, potential limp ...
The most common cause of P06AE (PCM/ECM/TCM Internal Temperature Sensor "B" Circuit High) is: Internal PCM/ECM circuit failure with an open sensor signal line reading as maximum voltage
Typical repair costs for P06AE range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without accurate internal temperature monitoring, the PCM may not protect itself from overheating, potentially leading to a total module failure and engine stall. Reduce driving in high-heat conditions and have the module diagnosed promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P06AE to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Control Module
Difficulty
Type
Generic (SAE)
Recommended Tools
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