P2E43Hybrid/EV Electronics Coolant Pump B Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2E43 means the command signal of electronics coolant pump B sits too low, typically because the line has contact with ground or the output stage cannot drive it up. On PWM-controlled pumps this usually stops the pump outright. Pierburg's CWA pumps, a widespread design, read a duty cycle of 0 to 1 % as stop and pull their PWM input to ground through 10 kΩ, so a grounded line leaves the rotor standing. Ford's 2024 summary treats circuit low (fault type 11) on its auxiliary pumps as a report from the smart driver, checked over 5 s at a battery voltage of at least 11 V. GM's 2016 hybrid tables fold grounded, voltage-shorted and open lines into a single pump A code, P0CE9. No manufacturer publicly documents P2E43. Chafed insulation and wet connectors are usual finds. The high-side code is P2E44, pump A's version P0CEB.
- What you may notice
- Pump B stops, electronics coolant heats up
- MIL with hybrid or drive system message
- Limited power or charging rate under load
- Likely causes
- LikelyControl wire chafed through and shorted to ground
- PossibleMoisture or corrosion bridging pins in the pump connector
- PossibleShorted input stage inside pump B
- RareOutput stage of the module stuck low
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.