Powertrain, generic (extended)

P26DF Sensor Power Supply D Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Sensor power supplies A to D are separate outputs of a control module that feed groups of sensors; they are a different family from the 5 V sensor reference voltages (P0641 and following). D is the fourth such output. P26DF is the general or open-circuit code for it. Deutz uses it in its EMR5/MD1 engine controllers for ECU sensor supply voltage 4 (SPN 3512), with fault types for special instructions and for an unknown root cause, but publishes no thresholds. Other makers do not document P26DF in public. If supply D drops out, every sensor fed by it reports implausible values at the same moment, so a cluster of unrelated sensor codes is the typical picture. Low and high faults of the same output are P26E0 and P26E1.

Likely causes

Broken supply wire or splice to the sensors on output D
Loose or corroded pin at the control module or a sensor
Supply output D inside the control module failed

Symptoms

  • Check engine light
  • Several sensor codes stored together
  • Reduced power or emergency mode depending on the sensors affected

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–900
Time1–4 h

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

Parts involved

control modulesensor supply dwiring harness

Related codes

P26E0P26E1P06E6P06B0P06B3

References: serdia.deutz.com, law.cornell.edu.