P06AD

What it means

P06AD means the control module has detected that the signal from its internal temperature sensor 'B' is lower than the expected range. The module monitors its own internal temperature to protect itself and to adjust certain functions. The signal voltage sat below the lower limit, which usually points to a fault inside the module itself rather than anything external.

Symptoms

• Engine management warning light on
• Possible reduced performance or limp mode in some vehicles
• Other stored fault codes relating to the control module or its processor
• Intermittent starting or running problems if the module is unstable
• No noticeable symptoms other than the warning light

Possible causes

• Fault in the control module's internal temperature sensor or its circuitrylikely
• Control module internal fault caused by heat, age or manufacturing defectlikely
• Low or unstable power supply or poor earth to the control module affecting the sensor readingpossible
• Water ingress, corrosion or damaged connector pins at the control modulepossible
• Outdated or faulty module software where a manufacturer calibration update is known to address the faultrare
• Previous electrical fault such as a short or jump-start surge damaging the modulerare

How to diagnose

1. Read all stored codes and freeze frame data, noting any other module, power supply or communication faults
2. Check the battery condition and charging voltage, as low or unstable voltage can upset internal monitoring
3. Inspect the control module, its connectors and wiring for water ingress, corrosion, heat damage or bent pins
4. Check the main power feeds and earth connections to the module for voltage drop and security
5. Clear the code and road test to see whether it returns immediately or only when hot or cold
6. View live data for the module internal temperature, if available, and see if it reads implausibly low or does not change
7. Check for manufacturer software updates or technical service bulletins for the specific make, model and engine
8. If all external checks pass, confirm the module fault with the manufacturer's procedure before replacing it

How to fix

• Repair or replace any corroded, damaged or loose connectors, power feeds and earth connections
• Correct battery or charging system faults that are causing unstable supply voltage
• Dry out and repair any water ingress, and fix the source of the leak
• Apply an updated manufacturer calibration if one is available for this fault
• Repair or replace the control module, then program or code it to the vehicle as required by the manufacturer

Can I keep driving?

Nearby codes

• P06ACGenericControl Module Internal Temperature Sensor B Range/Performance
• P06AEGenericControl Module Internal Temperature Sensor B Circuit High