P2DB4 code meaning
Drive Motor A Temperature Sensor C Circuit High
Powertrain system Generic code P2Dxx codes Check engine light
What P2DB4 means
P2DB4 is the open-circuit side of sensor C: the voltage climbs toward the reference because hardly any current still flows through the thermistor. A broken wire, a terminal backed out of the motor connector, corrosion or a cracked thermistor are the likely finds; a short to a supply voltage is rarer. With an NTC the value shown would be an impossibly cold winding. For the W-phase probe of the same Mitsubishi (sensor 3, own code P3055) the limit is likewise 4.93 V held half a second with at least 8 V at the power drive unit, and the repair path ends with a new power drive unit or front motor. The UAES patent places the upper limit just below supply voltage. No manufacturer documents P2DB4 itself. P2DB3 is the low side, P2DAF the same fault on sensor B.
P2DB4 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 12 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2DB4
- Hybrid system warning and check engine light
- Sensor C reads far below ambient temperature in live data
- Electric drive power limited
Common causes of P2DB4
- Most likelyOpen signal or ground lead of sensor C
- PossibleTerminal backed out or corroded in the motor connector
- PossibleThermistor open inside the stator
- Less likelySignal lead shorted to a supply voltage
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor a temp sensor cWiring harnessInverter
What each part of P2DB4 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| B4 | The exact fault in that area. |
What to do next
- Note P2DB4 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 P2DB4
What does P2DB4 mean?
P2DB4 means "Drive Motor A Temperature Sensor C Circuit High". P2DB4 is the open-circuit side of sensor C: the voltage climbs toward the reference because hardly any current still flows through the thermistor. It is a generic code, so it means the same on every make.
Is it safe to drive with P2DB4?
Drive gently and only to a workshop. With P2DB4 the car can go into limp mode (reduced power) to protect itself.
Will P2DB4 fail an emissions test?
Yes, it can. P2DB4 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 P2DB4 to fix?
Difficulty: workshop only. A typical repair takes 1 to 12 hours of work. This is a job for a workshop.
Will P2DB4 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.