P2DB6 code meaning
Battery Charger B Cooling System Performance
What P2DB6 means
P2DB6 is set when the cooling of a second on-board charger, charger B, cannot hold the unit inside its permitted temperature window, so the charger has to cut its power or stop. No manufacturer documents P2DB6 publicly. Mercedes shows the A-side case P0D8F on the AMG GLE 53 Hybrid (LI47.70-P-079963): AC charging ended after about 15 minutes because the low-temperature coolant lines of charger and power electronics had been connected the wrong way round, and the charger's two coolant temperature sensors also disagreed. CARB requires plug-in hybrids to flag charger faults that stop charging or slow it down. A charger B temperature beyond its limit is reported separately as P0E85. For the driver, plug-in charging becomes slow or aborts.
P2DB6 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2DB6
- Charging power reduced at the charge station
- Plug-in charging stops after some minutes
- Charging fault message in the instrument cluster
Common causes of P2DB6
- Most likelyLow coolant level or trapped air in the charger cooling circuit
- PossibleElectric coolant pump of the low-temperature circuit weak or failed
- Less likelyCoolant hoses connected to the wrong circuit after assembly or repair
- Less likelyLow-temperature radiator clogged or its airflow obstructed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Battery charger b coolingOn board charger
What each part of P2DB6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| B6 | The exact fault in that area. |
What to do next
- Note P2DB6 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 P2DB6
What does P2DB6 mean?
P2DB6 means "Battery Charger B Cooling System Performance". P2DB6 is set when the cooling of a second on-board charger, charger B, cannot hold the unit inside its permitted temperature window, so the charger has to cut its power or stop. It is a generic code, so it means the same on every make.
Is it safe to drive with P2DB6?
P2DB6 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2DB6 fail an emissions test?
P2DB6 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2DB6 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2DB6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.