P06AA

What it means

P06AA means a control module has measured its own internal temperature (sensor B) above the calibrated limit. The module monitors its own temperature with a built-in sensor and sets this code when the reading stays too high. Which module is affected, and where sensor B sits, depends on the vehicle and the manufacturer's definition.

Symptoms

• Engine warning light on
• Reduced power or limp mode
• Engine misfire, hesitation or rough running
• Intermittent loss of function in systems the module controls
• Engine stalling or hard starting
• Other related fault codes stored, such as supply voltage or driver circuit faults

Possible causes

• Module overheating from high ambient temperature, such as heat soak from a nearby engine, exhaust or turbocharger componentlikely
• Excessive current draw in an output circuit controlled by the module, for example a shorted or faulty actuator, injector, coil or solenoidlikely
• Poor mounting or heat transfer, such as a loose, missing or damaged heat shield, bracket or cooling path where the module is cooledpossible
• Wiring or connector faults causing high resistance, short circuits or voltage supply problems at the modulepossible
• Charging system fault causing abnormal supply voltage to the modulepossible
• Internal fault in the control module or its temperature sensing circuit giving a false high readingrare
• Water ingress or corrosion inside the module housing or connectorsrare

How to diagnose

1. Read all stored codes and freeze frame data, noting engine temperature, load and battery voltage when the code set, and check for related codes
2. Identify which module reports the code and where it is mounted for this vehicle, using manufacturer information
3. Inspect the module, its mounting, heat shields and surrounding area for heat damage, missing shields, debris or signs of water ingress
4. Inspect the connectors and wiring to the module for corrosion, burnt pins, chafing or melted insulation
5. Check battery condition and charging voltage with the engine running to confirm the supply is within specification
6. Test the circuits and components driven by the module for shorts or excessive current draw, following the manufacturer's procedure for the affected system
7. Monitor the module temperature reading if available on live data and compare it with ambient and engine temperature
8. Clear the code and road test, then recheck whether it returns and under what conditions

How to fix

• Repair or replace damaged or missing heat shields, brackets and any cooling provisions for the module
• Replace the faulty actuator, injector, coil or solenoid that is drawing excessive current
• Repair wiring or connector faults, including corrosion, burnt pins or damaged insulation
• Correct charging system or battery faults that cause abnormal supply voltage
• Dry out and repair water ingress sources, then replace the module only if it has been damaged
• Replace or replace and programme the control module only after other causes are ruled out and the manufacturer's procedure confirms it is faulty

Can I keep driving?

Nearby codes

• P06A9GenericSensor Reference Voltage D Circuit Range/Performance
• P06ABGenericControl Module Internal Temperature Sensor B Circuit