Powertrain, generic (extended)

P2DB6 Battery Charger B Cooling System Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Low coolant level or trapped air in the charger cooling circuit
Electric coolant pump of the low-temperature circuit weak or failed
Coolant hoses connected to the wrong circuit after assembly or repair
Low-temperature radiator clogged or its airflow obstructed

Symptoms

  • Charging power reduced at the charge station
  • Plug-in charging stops after some minutes
  • Charging fault message in the instrument cluster

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–1,200
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

battery charger b coolingon board charger

Related codes

P0D8FP0E85P0A93

References: static.nhtsa.gov, law.cornell.edu.