Powertrain, generic (extended)

P26E0 Sensor Power Supply D Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P26E0 means the fourth sensor supply output of the control module is pulled below its normal level. Deutz documents it for the fourth ECU sensor supply, SPN 3512, in two variants: excessive current or a grounded circuit (FMI 6), and a reading below the physical limit with top severity (FMI 1). In practice a single sensor with an internal short, or a chafed supply wire touching ground, loads the output so much that the module limits or switches it off. All other sensors on the same rail then lose their feed too. A good strategy is to unplug the sensors on supply D one by one and watch whether the voltage recovers. No other maker publishes the code; CARB requires such supplies to be monitored when emission-related sensors depend on them.

Likely causes

One sensor on supply D with an internal short pulling the output down
Supply wire chafed and touching engine ground
Moisture in a sensor plug bridging supply and ground

Symptoms

  • Check engine light
  • Group of sensor faults appearing at once
  • Engine derate or emergency mode

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 dsensors on rail d

Related codes

P26DFP26E1P06E7P06B1P06B4

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