P2BDC code meaning
Motor Electronics Coolant Temperature Sensor C Circuit
Powertrain system Generic code P2Bxx codes Check engine light
What P2BDC means
P2BDC reports a general fault in the circuit of coolant temperature sensor C, a third measuring point that some drives use in the loop cooling the inverter, converter and motor. The code stands for a signal the module cannot use without assigning it to the low, high or plausibility codes P2BDE, P2BDF and P2BDD. No manufacturer documents P2BDC, or a third sensor of this kind, publicly. As a guide to what such a module accepts as a valid signal, GM's 2011 Volt tables keep their single electronics coolant sensor between 2 % and 98 % of the 5 V reference and treat an exit from that window in 16 out of 20 readings, one every 250 ms, as a Type B fault. CARB requires circuit checks on these inputs. Without the value, cooling falls back to safe defaults.
P2BDC 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 P2BDC
- Warning lamp for the hybrid or drive system
- Fan and electronics pump running at high output as a precaution
- Possibly reduced electric power
Common causes of P2BDC
- Most likelyPoor contact at the sensor C connector
- PossibleChafed or broken wiring between sensor C and the module
- PossibleDefective sensor C
- Less likelyFault on a 5 V reference or sensor ground shared with other sensors
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 cWiring harnessHybrid control module
What each part of P2BDC 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. |
| DC | The exact fault in that area. |
What to do next
- Note P2BDC 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 P2BDC
What does P2BDC mean?
P2BDC means "Motor Electronics Coolant Temperature Sensor C Circuit". P2BDC reports a general fault in the circuit of coolant temperature sensor C, a third measuring point that some drives use in the loop cooling the inverter, converter and motor. It is a generic code, so it means the same on every make.
Is it safe to drive with P2BDC?
Drive gently and only to a workshop. With P2BDC the car can go into limp mode (reduced power) to protect itself.
Will P2BDC fail an emissions test?
Yes, it can. P2BDC 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 P2BDC to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2BDC clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.