Low or unstable battery or supply voltage upsetting the module's internal monitoring; Poor module power or earth connections, including corroded or loose terminals; Internal fault in the control module affecting the temperature sensor circuit; Water ingress, corrosion or heat damage at the module or its connector; Outdated module software with a known fault in the internal temperature monitoring (model dependent); Wiring damage or connector fault where the module is mounted in a hot area, such as near the engine or exhaust.

P06AB

Control Module Internal Temperature Sensor B Circuit.

Generic
Powertrain
Generic code
Low severity

How this code is built

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

What it means

P06AB is a generic code meaning the powertrain control module has detected a fault in the circuit of Internal Temperature Sensor B, which is built into the control module itself. The module monitors the signal from this sensor and sets the code when the reading is implausible, out of range or stuck. Which module and which internal sensor 'B' refers to depends on the vehicle, so check the manufacturer's information for the model.

Symptoms

Engine warning light on
Usually no noticeable change in how the car drives
Possible reduced performance or limp mode if the module cannot trust its own temperature data
Other stored fault codes relating to the control module or its supply voltage
Intermittent warning light that comes and goes with temperature or battery condition

Possible causes

Low or unstable battery or supply voltage upsetting the module's internal monitoringlikely
Poor module power or earth connections, including corroded or loose terminalslikely
Internal fault in the control module affecting the temperature sensor circuitpossible
Water ingress, corrosion or heat damage at the module or its connectorpossible
Outdated module software with a known fault in the internal temperature monitoring (model dependent)rare
Wiring damage or connector fault where the module is mounted in a hot area, such as near the engine or exhaustrare

How to diagnose

Read all stored codes and freeze frame data, noting battery voltage, engine temperature and any other module or voltage-related codes
Test battery condition and charging system output, and fix any problems before going further
Inspect the module's connectors, pins, power feeds and earths for corrosion, looseness, moisture or heat damage
Check the module's mounting location for water ingress, physical damage or excessive heat exposure
Clear the code, then road test and recheck to see whether it returns immediately or only under certain conditions
Check the manufacturer's information for any software update or technical bulletin relating to this code for the specific model and engine
Measure power and earth supply voltage drops at the module under load, following the manufacturer's wiring diagram
If everything else checks out, confirm the module itself is faulty using the manufacturer's diagnostic procedure

How to fix

Replace or recharge a weak battery and repair any charging system fault
Clean and tighten or repair faulty power and earth connections
Repair damaged wiring or connectors, and dry out and treat any water ingress at the source
Install any available manufacturer software update if an outdated calibration is a known cause for the model
Replace or repair the control module if it is confirmed faulty, with correct programming for the vehicle

Can I keep driving?

Low severity

The car can usually be driven normally while you arrange a check, as the fault rarely affects running. If it goes into limp mode, or other warnings or drivability problems appear, have it checked sooner.

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