P2ADE code meaning
Reductant Tank Temperature Sensor B Circuit
Powertrain system Generic code P2Axx codes Check engine light
What P2ADE means
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.
P2ADE at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2ADE
- Check engine light on
- DEF or SCR warning
- Possible inducement countdown
Common causes of P2ADE
- Most likelyOpen signal line or unplugged tank sensor connector
- PossibleFailed tank sensor unit
- Less likelyInput fault in the SCR or engine control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant tank temperature sensor bWiring harnessSCR module
What each part of P2ADE means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| A | Area: hybrid propulsion. |
| DE | The exact fault in that area. |
What to do next
- Note P2ADE and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2ADE
What does P2ADE mean?
P2ADE means "Reductant Tank Temperature Sensor B Circuit". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2ADE?
Drive gently and only to a workshop. With P2ADE the car can go into limp mode (reduced power) to protect itself.
Will P2ADE fail an emissions test?
Yes, it can. P2ADE is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2ADE to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2ADE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.