What are the common causes of P06AC?

A drifting internal temperature sensor B. A corroded sensor B connector. An intermittent sensor B circuit. Module overheating during operation. A faulty module.

Compare sensor B to ambient temperature. Watch sensor B for erratic readings. Inspect the module connector. Check module cooling. Replace the module if sensor B drifts. Clear the code and retest.

P06AC

Control Module Internal Temperature Sensor B Range/Performance

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P06AC means Control Module Internal Temperature Sensor B Range/Performance.

Where it lives

For P06AC, start at the sensor the description names.

Check these first

A drifting internal temperature sensor B
A corroded sensor B connector
An intermittent sensor B circuit
Module overheating during operation
A faulty module

What to do next

Compare sensor B to ambient temperature
Watch sensor B for erratic readings
Inspect the module connector
Check module cooling
Replace the module if sensor B drifts
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.