Powertrain, generic (extended)

P2B6B Coolant Pump D Control Module Overtemperature

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With P2B6B the integrated electronics of coolant pump D report excessive temperature, and the pump derates or switches itself off to survive. No manufacturer documents this code publicly; the equivalent for pump B is P2B64, which Ford lists as failure type 98 (system over temperature), and for pump A it is P2B9E. Heat in the driver usually builds when coolant around the pump is missing or aerated, when the motor fights a sticking impeller, or when the pump sits close to hot engine or exhaust parts. A failing power stage inside the pump can also trigger the report. CARB 13 CCR 1968.2 (e)(15) covers such output components. Check level, bleeding and free rotation before changing parts. While the pump rests, its circuit gets less flow and may run hot.

Likely causes

Too little coolant or air at the pump
Sluggish impeller overloads the motor
Power stage inside the pump degraded

Symptoms

  • Warning lamp with stored code
  • Pump D cuts out after longer operation and restarts after cooling

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time0.5–4 h

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

Parts involved

coolant pump dwiring harnessecm

Related codes

P2B6AP2B6CP2B64P26F9P2DFBP2B9E

References: law.cornell.edu, fordservicecontent.com.