P2D4F code meaning
Hybrid/EV Battery Pack K Over Temperature
Powertrain system Generic code P2Dxx codes Check engine light
What P2D4F means
P2D4F reports that section K, the eleventh supervised section of a high-voltage battery, has gone over its temperature limit; overheating and ageing of the same section are kept apart, the latter being P2CD0. No manufacturer documents P2D4F publicly. In a liquid-cooled pack, sections far from the coolant inlet see the warmest coolant, so a weak pump, a low level or air left in the loop after service tends to show up there first. GM's 2016 table 16OBDG01 still checks the whole pack against 73.5 °C with 50 failures in 67 samples at 100 ms, Type A, and suspends the test while voltage, current or temperature sensor faults are active. Under CARB, the cooling performance of the pack has to be checked in operation. The car protects the cells by cutting power.
P2D4F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2D4F
- Warning light, often under load or in summer
- Reduced electric drive and charging power
- Coolant pump or fan audible for a long time after driving
Common causes of P2D4F
- Most likelyLow coolant level or air trapped in the battery loop, often after service
- PossibleWeak or intermittently failing battery coolant pump
- Less likelyWorn modules in section K (compare with P2CD0)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery pack kBattery thermal managementBattery energy control module
What each part of P2D4F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4F | The exact fault in that area. |
What to do next
- Note P2D4F 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 P2D4F
What does P2D4F mean?
P2D4F means "Hybrid/EV Battery Pack K Over Temperature". P2D4F reports that section K, the eleventh supervised section of a high-voltage battery, has gone over its temperature limit; overheating and ageing of the same section are kept apart, the latter being P2CD0. It is a generic code, so it means the same on every make.
Is it safe to drive with P2D4F?
Drive gently and only to a workshop. With P2D4F the car can go into limp mode (reduced power) to protect itself.
Will P2D4F fail an emissions test?
Yes, it can. P2D4F 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 P2D4F to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P2D4F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.