Powertrain, generic (extended)

P2D06 Motor Electronics Coolant Pump B Overspeed/Air in System

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

P2D06 says pump B of the motor electronics loop turns above its commanded speed, the classic sign of a pump that has lost its coolant column to air or a falling level. Ford documents a real case: customer satisfaction programme 23B09 covered 72 F-150 Lightning trucks of model years 2022–2023, built between 28 and 30 September 2022, whose high-voltage battery coolant tubes were made of the wrong material. A shrinking tube spigot could leak, and P2D06 could set together with the battery pump code P2B29, without the driver noticing anything; the fix was replacing both tube assemblies. So the leak need not be near pump B itself. Ford's 2024 summary handles overspeed/dry run as type B1. Bleed the loop and look for the leak; stalled is P2D05, underspeed P2D07.

Likely causes

Coolant leak anywhere in the shared loop, such as faulty battery coolant tubes (Ford 23B09)

Air left in the loop after filling without the prescribed bleeding procedure

Impeller slipping on the shaft or implausible speed feedback

Symptoms

Often none apart from the stored code
Falling level in the degas bottle or traces of coolant
Inverter overtemperature warning and reduced acceleration if the loss continues

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€40–800

Time0.5–3 h

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

Parts involved

motor electronics coolant pump bpower electronics coolant loop

Related codes

P2D05 P2D07 P2D01 P2D0B P2B29 P0A3C

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