Powertrain, generic (extended)

P2ADE Reductant Tank Temperature Sensor B Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2ADE is the general circuit code for reductant tank temperature sensor B, intended for systems that report a fault on this input without splitting it into low, high or erratic. No manufacturer documents P2ADE publicly. GM, where the sensor B family is on record, reports such faults through P2ADB, P2ADC and P2ADD plus the plausibility code P2ADA, and its 2025 DEF controller names exactly those four as the sensor B fault set. Deutz files an open circuit of its second tank temperature sensor at the suction point under its own code P1241 instead. CARB requires emission-related inputs to be checked for open circuits and for readings outside their possible range. Where P2ADE does show up, treat it as an open or unreadable sensor B circuit: inspect connector, wiring and the tank sensor unit.

Likely causes

Open signal line or unplugged tank sensor connector
Failed tank sensor unit
Input fault in the SCR or engine control module

Symptoms

  • Check engine light on
  • DEF or SCR warning
  • Possible inducement countdown

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,500
Time0.5–4 h

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

Parts involved

reductant tank temperature sensor bwiring harnessscr module

Related codes

P2ADAP2ADBP2ADCP2ADDP205A

References: law.cornell.edu, gsi.ext.gm.com, serdia.deutz.com.