Powertrain, generic · Computer and auxiliary outputs

P06F2 Reductant Control Module Internal Temperature Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Some SCR diesels have a separate reductant control module that drives the DEF pump, heaters and dosing valve – Ford calls it the pump motor controller (fault above 130 °C under P20FF), GM's L5P an SCR power module. It measures its own board temperature with an internal sensor to protect itself from heat. P06F2 means the signal is below its minimum; with the usual NTC voltage divider that is a short to ground, and the reading appears implausibly hot. The opposite fault is P06F3, an implausible reading P06F1. No manufacturer document available to us uses P06F0–P06F3; Ford and GM report related faults under P20FF or own codes. Without a valid temperature the module limits or stops heaters and pump, so dosing is restricted and an SCR warning, up to a start lock countdown, may follow.

Likely causes

Reductant control module or pump unit faulty (sensor is on the board)
Water ingress or corrosion in the module (DEF crystals, underbody location)
Supply or ground problems at the module
Module software or calibration

Symptoms

  • Check engine light or SCR warning
  • Message to check AdBlue system, possibly countdown to start lock
  • DEF heating or pump inactive (no thawing in frost)
  • Driveability usually unchanged

Repair estimate

DifficultyHardWorkshop job
Parts and labour€400–1,800
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

reductant control moduledef pump modulemodule power supply

Related codes

P06F0P06F1P06F3P20FFP21CBP0666

References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.