Powertrain, generic (extended)

P2BD4 Motor Electronics Coolant Pump C Control Circuit/Open

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

Hybrid and electric drives cool the inverter, DC/DC converter and motor with one or more electric pumps; J2012 labels them A, B and C. P2BD4 means the controlling module has found an open circuit or an unclassified fault on the control line of pump C. No manufacturer documents P2BD4, or a third pump of this kind, publicly. Comparable checks exist for pump A: Ford's 2019 hybrid summary sets P0A05 when no reply arrives from the pump for more than 9.25 s with 6–19 V on the system, and GM's 2016 tables for the Cadillac ELR flag P0CE9 for an open or shorted pump control line in 16 of 20 samples at 250 ms, Type B. CARB requires the electronic parts of inverter cooling to be monitored. Low and high faults of pump C are P2BD5 and P2BD6. Overheating electronics lead to reduced drive power.

Likely causes

Unplugged, loose or corroded connector at pump C

Broken control or signal wire between module and pump

Failed electronics inside the pump

Faulty output or input stage in the controlling module

Symptoms

Hybrid or drive system warning, often with the check engine light
Reduced drive power when the electronics heat up
Pump C silent during an actuator test

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€60–900

Time0.5–3 h

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

Parts involved

motor electronics coolant pump cwiring harnesshybrid control module

References: law.cornell.edu, fordservicecontent.com, gsi.ext.gm.com.