Internal fault in the reductant control module (sensor or electronics); Poor or unstable power supply or earth to the module, including low battery voltage; Corroded, loose or water-contaminated connector or terminals at the module; Heat damage to the module from its mounting position or nearby exhaust components; Damaged wiring or a communication network fault affecting the module; Outdated module software where the manufacturer lists it as a known cause.

P06F0

Reductant Control Module Internal Temperature Sensor Circuit.

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
F0: FaultThe specific fault in that area

What it means

P06F0 means the reductant control module, which manages the diesel exhaust fluid (SCR) dosing system, has detected a fault in the circuit of its own internal temperature sensor. The module saw a temperature signal that was out of range, implausible or missing, so it can no longer trust its own temperature reading. Where the module sits and how it is fitted depends on the vehicle, so the exact layout varies by model and engine.

Symptoms

Engine management or emissions warning light on
Exhaust fluid or SCR system warning message on the dash
Reduced or stopped reductant dosing, possibly with higher NOx emissions
Possible power or speed limitation, or a restart warning, if the fault stays active on some models
Other SCR or reductant-related codes stored alongside it

Possible causes

Internal fault in the reductant control module (sensor or electronics)likely
Poor or unstable power supply or earth to the module, including low battery voltagelikely
Corroded, loose or water-contaminated connector or terminals at the modulepossible
Heat damage to the module from its mounting position or nearby exhaust componentspossible
Damaged wiring or a communication network fault affecting the modulepossible
Outdated module software where the manufacturer lists it as a known causerare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting any other SCR, voltage or network codes
Check battery condition and charging voltage, as low or unstable voltage can upset the module
Inspect the module, its connector and the surrounding wiring for corrosion, water ingress, heat damage, chafing and loose pins
Check the module's power feeds and earth connections for voltage drop under load
Compare the module's live temperature reading with ambient temperature on a cold vehicle, looking for stuck, implausible or erratic values
Check the module's mounting location for excessive heat, damaged shielding or missing heat protection
Look up manufacturer technical information for this model and engine for known module faults or software updates
Clear the codes and retest to see whether the fault returns immediately or only when hot or damp

How to fix

Repair or replace damaged wiring, and clean or renew corroded connector terminals
Restore a good power supply and earth connection to the module
Correct battery or charging faults that cause low or unstable voltage
Refit or repair missing heat shielding and fix any water ingress around the module
Replace the reductant control module if its internal temperature sensor is faulty, and code or adapt it as the manufacturer specifies
Apply a manufacturer software update only if technical information confirms it addresses this fault

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but book it in soon because the SCR system may not dose properly and emissions will be higher. On some vehicles a persistent SCR fault leads to reduced power or a no-restart condition, so do not leave it.

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