P06F1

What it means

P06F1 is a generic code meaning the reductant control module (the unit that manages the diesel exhaust fluid dosing system) has found that its own internal temperature sensor reading is implausible or out of its expected range. The module compares the internal temperature with other inputs, such as ambient or coolant temperature after a long cold soak, or checks for readings that are stuck or change unrealistically. The exact plausibility test varies by manufacturer and model.

Symptoms

• Engine management or emissions warning light on
• Separate SCR or AdBlue-type system warning message on the dash
• Reduced dosing or dosing system disabled
• Possible reduced engine power or torque limit on some models
• Possible countdown or restart-inhibit warning if the fault persists on some models

Possible causes

• Faulty reductant control module (internal temperature sensor failure inside the unit)likely
• Excessive heat soak or poor heat dissipation at the module location, for example from exhaust proximity or a damaged heat shieldpossible
• Poor power or earth supply to the module causing implausible internal readings, such as corroded connectors or a weak batterypossible
• Water ingress, corrosion or contamination in the module connector or housingpossible
• Outdated or faulty module software where a manufacturer bulletin covers the faultrare
• Wiring or communication fault causing the module to misreport its statusrare

How to diagnose

1. Read all stored and pending codes and note any other SCR, supply voltage or communication codes, as these may point to a common cause
2. Review freeze frame data, including ambient and coolant temperature, battery voltage and the module temperature value if available
3. Inspect the module, its connector, wiring and mounting for water ingress, corrosion, heat damage, and a missing or damaged heat shield
4. Check battery condition and charging voltage, then check the module power and earth supplies and voltage drop under load
5. Compare the module's reported internal temperature with ambient and coolant temperature after a long cold soak; they should be close
6. Check for communication faults between the module and the engine control unit
7. Look up manufacturer service information for software updates or known issues for this model and engine
8. Clear the code, run the system through a drive cycle and recheck whether the fault returns

How to fix

• Repair or replace damaged wiring and connectors, and clean or treat corrosion on terminals
• Restore a good power and earth supply, and replace a weak battery if it is causing low voltage
• Refit or replace a damaged heat shield, or correct the mounting that is causing heat exposure
• Replace the reductant control module if its internal temperature reading is confirmed implausible, and code or adapt it as the manufacturer requires
• Update the module software only if the manufacturer lists an outdated calibration as a known cause
• Dry out and seal the connector area after fixing any water ingress source

Can I keep driving?

Nearby codes

• P06F0GenericReductant Control Module Internal Temperature Sensor Circuit
• P06F2GenericReductant Control Module Internal Temperature Sensor Circuit Low