What Does P06AA Mean?
The PCM/ECM/TCM has detected that its internal temperature at sensor location "B" has exceeded the maximum allowable threshold. The control module is overheating, which can cause erratic operation, processing errors, or the module entering a protective shutdown mode. The driver may experience intermittent driveability issues, transmission shifting problems, or a sudden limp mode activation when the module temperature rises too high.
Common Causes
30%
PCM/ECM/TCM mounted in a location with inadequate ventilation or near a heat source
25%
Excessive under-hood temperature from cooling system fault, causing module overheating
20%
Internal module component degradation causing increased self-heating
15%
Missing or damaged heat shield or insulation near the control module
10%
Module connector with high-resistance connections causing localized heating
Diagnostic Steps
1
Monitor the PCM/ECM/TCM internal temperature "B" sensor reading via scan tool during a drive cycle; compare to specification (most modules operate safely up to 185°F / 85°C).
2
Check under-hood temperature with an infrared thermometer near the control module; verify the engine cooling system is operating normally with the thermostat opening at specification.
3
Inspect the control module mounting location for missing heat shields, blocked air passages, or proximity to exhaust components.
4
Check for coolant system faults that might cause elevated underhood temperatures — verify coolant level, thermostat operation, and cooling fan function.
5
Inspect the module connectors for signs of heat discoloration, melted plastic, or burnt terminals which would indicate high-resistance connections generating heat.
6
If the module itself is overheating with normal ambient conditions, it may have internal component degradation requiring replacement.
Estimated Repair Cost
$100 - $1,200
Parts + labor, varies by vehicle and location
The PCM/ECM/TCM has detected that its internal temperature at sensor location "B" has exceeded the maximum allowable threshold. The control module is overheating, which can cause erratic operation, processing errors, or the module entering a protective shutdown mode. The driver may experience interm...
The most common cause of P06AA (PCM/ECM/TCM Internal Temperature "B" Too High) is: PCM/ECM/TCM mounted in a location with inadequate ventilation or near a heat source
Typical repair costs for P06AA range from $100 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An overheating control module can enter protective shutdown or limp mode unexpectedly, causing sudden loss of power or inability to shift. This is dangerous at highway speeds. If this code is present and the vehicle is entering limp mode or stalling, do not drive until repaired. Short trips with monitoring may be acceptable if symptoms are minor.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P06AA 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
Powertrain Control Module
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
