P06AB: Control Module Internal Temperature Sensor B Circuit

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. P06AB is the general circuit fault of sensor B. No manufacturer table available to us uses P06AB itself – GM splits the faults into range (P06AC), low (P06AD) and high (P06AE). Expect a warning lamp and a substitute temperature with changed shifting.

Symptoms

• Warning or check engine light
• Changed shift quality (substitute value)
• Implausible module temperature in the scan tool

Most likely causes

• Transmission module or valve body (internal sensor) faulty
• Moisture or fluid in the module electronics
• Module supply or software

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the battery and grounds
2. Clear the code and see if it returns
3. If it is a reference voltage code, disconnect sensors one at a time and see if the voltage recovers
4. Check whether a software update is available
5. Do not replace the control module without a full diagnosis

Good to know

• Repair difficulty: hard
• It can trigger limp mode.
• It affects emissions.

What each character of P06AB means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 6: Control modules and outputs
• AB: Specific fault in that system

Frequently asked questions

Can I keep driving with code P06AB?

It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.

What causes code P06AB?

The most common causes are: transmission module or valve body (internal sensor) faulty; moisture or fluid in the module electronics; module supply or software.

Related codes

• P06ACControl Module Internal Temperature Sensor B Range/Performance
• P06ADControl Module Internal Temperature Sensor B Circuit Low
• P06AEControl Module Internal Temperature Sensor B Circuit High
• P06AAControl Module Internal Temperature B Too High
• P0666Control Module Internal Temperature Sensor A Circuit

Sources

• law.cornell.edu: 13 CCR 1968.2
• saabwisonline.com: dtc p06ac p06ae
• gsi.ext.gm.com: 19OBDG03C Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.