P06AA code meaning
Control Module Internal Temperature B Too High
What P06AA means
Control modules can carry a second internal temperature sensor (B). In GM's 6T70/6T75 and related automatics, sensor A measures the circuit board (substrate) temperature, sensor B the 'power-up temperature' used as a reference and substitute; both sit inside the transmission module in the valve body, so repairs mean module or valve body. P06AA would report an overtemperature measured by sensor B – the counterpart of P0634 for sensor A (GM: 142 °C, Saab 9-4X: 146 °C with a limp mode in reverse and 5th gear). No manufacturer document available to us uses P06AA itself; GM reports overtemperature via sensor A. Check transmission fluid temperature, cooler and charging voltage first.
P06AA at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P06AA
- Transmission limp mode possible
- Transmission warning
- Often transmission overtemperature as well
Common causes of P06AA
- Most likelyTransmission fluid too hot (cooler, lines, level)
- PossibleCharging system overvoltage
- PossibleFaulty internal sensor or module
- Less likelyHigh sustained load (towing, heat)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Transmission control moduleControl module internal temperature sensor
What each part of P06AA means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| AA | The exact fault in that area. |
What to do next
- Note P06AA and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P06AA
What does P06AA mean?
P06AA means "Control Module Internal Temperature B Too High". Control modules can carry a second internal temperature sensor (B). It is a generic code, so it means the same on every make.
Is it safe to drive with P06AA?
Drive gently and only to a workshop. With P06AA the car can go into limp mode (reduced power) to protect itself.
Will P06AA fail an emissions test?
P06AA is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P06AA to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P06AA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.