Powertrain, generic (extended)

P2B62 Coolant Pump B Supply Voltage Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2B62 flags a supply voltage problem at coolant pump B, an electrically driven auxiliary pump with its own electronics. Ford's 2024 gasoline OBD summary files it as failure type 1C (supply voltage outside its permitted band) under base code P261A, in the check of pump B, which Ford defines as the high-temperature-loop auxiliary pump for component cooling #1. The check runs continuously, needs at least 11 V battery voltage and has a monitoring time of 5 seconds. Typical triggers are a blown fuse, a weak relay, corroded power or ground pins or a discharged battery. Faults on the control line are reported separately by P261A to P261D, the same supply fault on pump D by P2B69. With insufficient voltage the pump slows or stops, and the component it cools may overheat.

Likely causes

Pump fuse blown or supply relay not closing properly
Corroded or loose power or ground connection at the pump
Weak battery or charging system fault lowering supply voltage
Voltage detection inside the pump electronics faulty

Symptoms

  • Warning lamp with stored code
  • Auxiliary pump runs slowly or not at all
  • Rising temperature of the component cooled by pump B

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€30–600
Time0.5–3 h

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

Parts involved

coolant pump bwiring harnessecm

Related codes

P261AP2B63P2B64P2B9DP2B69

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