P2BDA code meaning
Motor Electronics Coolant Temperature Sensor B Circuit Low
Powertrain system Generic code P2Bxx codes Check engine light
What P2BDA means
P2BDA is set when the sensor B signal in the electronics coolant loop falls below its valid window. These sensors are normally NTC thermistors, so a low voltage translates into an impossibly hot reading; a signal wire touching ground or a shorted sensor is the classic cause. No manufacturer documents P2BDA publicly. On sensor A of GM's 2013 Two-Mode hybrid trucks, the low fault P0A02 sets when the converted value reaches 162.1 °C in 30 of 50 samples taken every 100 ms, after propulsion has been active for more than 10 s; it is Type B. CARB requires such inputs to be tested against their valid limits. The opposite fault is P2BDB. The system may cut power because it believes the electronics are overheating.
P2BDA at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2BDA
- Check engine light and hybrid system warning
- Scan tool shows an implausibly high electronics coolant temperature
- Power reduction even with a cold vehicle
Common causes of P2BDA
- Most likelySignal wire of sensor B shorted to ground
- PossibleInternally shorted sensor B
- PossibleMoisture in the sensor connector creating a leakage path to ground
- Less likelyFaulty input stage in the evaluating module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Motor electronics coolant temp sensor bWiring harnessHybrid control module
What each part of P2BDA means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| B | Area: hybrid propulsion. |
| DA | The exact fault in that area. |
What to do next
- Note P2BDA 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 P2BDA
What does P2BDA mean?
P2BDA means "Motor Electronics Coolant Temperature Sensor B Circuit Low". P2BDA is set when the sensor B signal in the electronics coolant loop falls below its valid window. It is a generic code, so it means the same on every make.
Is it safe to drive with P2BDA?
Drive gently and only to a workshop. With P2BDA the car can go into limp mode (reduced power) to protect itself.
Will P2BDA fail an emissions test?
Yes, it can. P2BDA 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 P2BDA to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2BDA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.