Powertrain, generic (extended)

P2D8F Engine Oil Pressure Sensor/Switch C Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2D8F means the signal of oil pressure sensor C lies below its valid electrical range, which usually points to a short to ground, a lost supply or a defective sensor. Audi uses the code on 2025–2026 A5, S5, Q5 and SQ5 models with the 2.0 TFSI EA888 evo5 (TSB 2079097): engine control unit J623 stores it with symptom 17004, and the cluster may show the oil pressure and emission warnings. The first release blamed the control unit calibration. The revision adds that a voltage spike from a powerful charger switched on together with the ignition can set it, so the charger is connected first, the memory cleared and no parts replaced unless the code comes back. For sensor A, Ford flags an analog signal under 0.25 V for 5 s and a GM 2024 engine table under 0.25 V for 1 s. High is P2D90.

Likely causes

Signal or supply wire of sensor C shorted to ground
Voltage spike from a workshop charger switched on with the ignition (Audi EA888 evo5)
Sensor C defective with output stuck near zero
Engine control calibration that sets the fault too readily

Symptoms

  • Oil pressure warning without real pressure loss
  • Emission control warning lamp
  • Warning message in the instrument cluster

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–300
Time0.2–1.5 h

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

Parts involved

engine oil pressure sensor cwiring harnessecm

Related codes

P2D8EP2D90P2D91P0522P055C

References: static.nhtsa.gov, static.nhtsa.gov, fordservicecontent.com, gsi.ext.gm.com.