P06AA: Control Module Internal Temperature B Too High

What it means

The control module has detected that its internal temperature is above the expected range. The code does not identify the cause by itself.

At a glance

• Usually lights the check-engine light

How it works

The control module monitors its own internal temperature, and this code indicates that the monitored temperature has risen above the expected range. Heat around the module can raise its temperature, while a faulty internal temperature sensor or module can also produce an inaccurate high reading. The code alone does not distinguish between actual overheating and a sensing fault.

Common causes

Most likely first.

1. Excessive heat around the control module
2. Internal temperature sensor or module fault

Symptoms

• Check-engine light may be on
• Module-related faults or reduced engine operation may occur

How to diagnose it

1. Save freeze-frame data and scan for other module or temperature-related codes to determine whether the high reading coincided with reduced operation or other faults.
2. Check live data for the module's internal temperature and note whether it rises with operating conditions or remains implausibly high.
3. Inspect the area around the control module for unusual heat sources, blocked airflow, or signs of heat damage.
4. Check the module housing and accessible connectors for damage, moisture, or poor contact that could affect temperature sensing.
5. If the surrounding conditions appear normal, follow the manufacturer's procedure to distinguish a failed internal temperature sensor from a module fault.

Common fixes

• Restore any obstructed airflow or remove an identified external heat source near the module.
• Repair a damaged or poorly seated module connector if inspection identifies a connection problem.
• Replace the control module if testing confirms its internal temperature sensing has failed.
• Address the source of actual excessive heat if the module temperature rises under normal operation.

Can I keep driving?

If the vehicle shows reduced power, stalls, or develops multiple module warnings, stop driving and have it checked, since excessive module heat can disrupt control functions. If it runs normally, keep the trip short and avoid heavy loads until the temperature reading and module area are checked.