P06F2

What it means

P06F2 means the reductant control module (the control unit that manages the exhaust fluid, or AdBlue, dosing system) saw a voltage from its own internal temperature sensor that was lower than expected. This is usually an internal module fault or a power, ground or connector problem affecting the module. Where the module is built into the dosing pump or tank unit, the whole assembly may be involved. This depends on the model and engine.

Symptoms

• Engine management or exhaust fluid warning light on
• Warning message about the exhaust fluid or emissions system
• Exhaust fluid dosing stopped or reduced
• Reduced engine performance or a limp mode in some vehicles
• Countdown to a restricted start or no-restart warning on some models
• Other reductant system or module communication codes stored

Possible causes

• Internal fault in the reductant control module (temperature sensor or its circuit inside the module)likely
• Corroded, wet or loose connector terminals at the module or dosing unitpossible
• Low or unstable supply voltage, or poor ground, to the modulepossible
• Damaged or chafed wiring to the module where it is mounted separatelypossible
• Water ingress or heat damage to the module or its housingpossible
• Outdated or faulty module software where the manufacturer has issued a known fixrare
• Fault in the integrated pump or dosing unit containing the modulerare

How to diagnose

1. Read all stored and pending codes and note any other reductant, power supply or communication faults
2. Review freeze frame data for battery voltage, ambient temperature and engine state when the code set
3. Check battery condition and charging voltage, as low voltage can cause false module faults
4. Inspect the module, its connector and the wiring for water, corrosion, heat damage, bent pins or chafing
5. Check the module's power feeds, fuses and ground connections against the wiring diagram for the vehicle
6. Compare the module's live temperature reading with ambient temperature on a cold vehicle, where data is available
7. Clear the code and see whether it returns straight away, which points to a hard fault rather than a one-off
8. Check for manufacturer software updates or technical bulletins for the module on that model

How to fix

• Clean, dry and repair the connector, or replace damaged terminals
• Repair any damaged wiring, power or ground faults found
• Correct battery or charging faults that cause low or unstable voltage
• Update the module software where an updated calibration is a known fix for this fault
• Replace the reductant control module, or the dosing unit if the module is integrated, once other causes are ruled out
• Check the module is coded or adapted to the vehicle after replacement, following the manufacturer's procedure

Can I keep driving?

Nearby codes

• P06F1GenericReductant Control Module Internal Temperature Sensor Range/Performance
• P06F3GenericReductant Control Module Internal Temperature Sensor Circuit High