PCM/ECM/TCM Internal Temperature Sensor Circuit High
The P06AE code indicates that the powertrain control module (PCM), engine control module (ECM), or transmission control module (TCM) has detected a voltage signal from its internal temperature sensor that is higher than the expected range. This sensor monitors the internal temperature of the module to prevent overheating. A high circuit condition typically means the sensor circuit has an open, short to voltage, or the sensor itself has failed. This can lead to inaccurate temperature readings, potentially causing the module to limit performance or enter a failsafe mode.
1. Most Common Causes
- Internal failure of the control module temperature sensor 'B'
- Short circuit to positive voltage in the internal sensor circuit
- Damaged internal wiring within the PCM/ECM/TCM
- Faulty control module (PCM/ECM/TCM)
- Extreme environmental conditions affecting sensor readings
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine or transmission performance
- Vehicle may enter limp mode
- Overheating warnings or erratic temperature readings
- Possible stalling or no-start conditions
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Inspect the PCM/ECM/TCM connectors for corrosion, damage, or loose pins.
Step 3: Measure the voltage at the internal temperature sensor circuit; compare to manufacturer specifications.
Step 4: If voltage is high, check for shorts to battery voltage or open circuits.
Step 5: If circuit tests normal, suspect a failed module and perform a module reprogramming or replacement.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause the module to overheat or enter limp mode, leading to reduced performance or potential stalling.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but if module replacement is needed, it can be significantly higher.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.