Internal fault in the control module affecting the temperature sensor circuit; Poor or corroded module power supply or earth connections; Water ingress or corrosion inside the module or its connector; Low or unstable system voltage from a weak battery or charging fault; Damaged wiring or loose or spread connector pins at the module; Outdated or faulty module software where the manufacturer has issued a correction; Extreme heat or cold exposure of the module affecting the reading.

P06AE

Control Module Internal Temperature Sensor B Circuit High.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
AE: FaultThe specific fault in that area

What it means

P06AE means the engine or powertrain control module has detected that its own internal temperature sensor B is reporting a signal that is too high in voltage, which is outside the expected range. The sensor sits inside the control unit, so the fault points to the module itself, its power and earth supply, or its connector and housing condition. Which module carries sensor B and how it is monitored varies by vehicle, so check the manufacturer's information for that model.

Symptoms

Engine warning light on
Other stored codes relating to module supply voltage or internal faults
Intermittent hesitation, reduced power or limp mode on some vehicles
Hard starting or intermittent no-start if the module is failing
No noticeable symptoms other than the warning light

Possible causes

Internal fault in the control module affecting the temperature sensor circuitlikely
Poor or corroded module power supply or earth connectionspossible
Water ingress or corrosion inside the module or its connectorpossible
Low or unstable system voltage from a weak battery or charging faultpossible
Damaged wiring or loose or spread connector pins at the modulepossible
Outdated or faulty module software where the manufacturer has issued a correctionrare
Extreme heat or cold exposure of the module affecting the readingrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including battery voltage and engine conditions when the code set
Check for related codes such as supply voltage, communication or other internal module faults, as these point to a shared cause
Test battery condition and charging voltage, and correct any problem before going further
Inspect the module, its connectors and mounting area for water, corrosion, heat damage or physical damage
Check the module's power and earth feeds for voltage drop under load, following the manufacturer's wiring information
Check for manufacturer service bulletins and available software updates for that model and engine
Clear the code and road test to see if it returns, then check the live data for the internal temperature reading if the vehicle provides it
Only after wiring, supply and software are ruled out, confirm the module as faulty with manufacturer-specific tests

How to fix

Repair or clean the module power and earth connections and correct any voltage drop
Repair damaged wiring or replace faulty connector terminals
Dry out and fix the source of water ingress, and replace the module if corrosion has damaged it
Replace or repair a weak battery or faulty charging system
Update the module software where an outdated calibration is a known cause for that model
Replace or repair the control module and have it programmed or coded to the vehicle as required

Can I keep driving?

Medium severity

The car can usually be driven short-term if it runs normally, but get it checked soon as a failing module can cause stalling or loss of power. If it goes into limp mode, starts badly or stalls, limit driving until it is fixed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.