Powertrain, generic (extended)

P26E1 Sensor Power Supply D Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With P26E1 the fourth sensor supply of the control module reads higher than its regulated value. Deutz assigns it to SPN 3512 with FMI 0, meaning a reading beyond the upper physical limit, rated as most severe. Since the module regulates this output itself, an excessive reading normally comes from outside: a wire of supply D shorted to battery voltage or to another, higher supply, or a sensor feeding voltage back. Raised supply shifts every signal of the sensors connected to it and can damage them, so the module usually reacts strongly. Fewer real-world cases arise than for P26E0, but checking the harness for melted sections near hot or moving parts is the first step. Open circuits on the same output fall under P26DF.

Likely causes

Supply D wire shorted to battery voltage or a higher supply
Faulty sensor feeding voltage back into the supply rail
Regulator for supply D in the control module defective

Symptoms

  • Check engine light
  • Implausible readings from several sensors
  • Possible derate depending on the sensors involved

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

P26DFP26E0P06E8P06B2P06B5

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