P2DFACoolant Pump E Supply Voltage Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Unlike P2DF4 to P2DF6, which concern the command line, P2DFA concerns the power feed of coolant pump E. Smart pumps measure the voltage at their own supply pin and report when it leaves the window they need to run reliably. No manufacturer documents P2DFA publicly. Ford codes a feed outside its permitted band as fault type 1C for its two auxiliary pumps (2024 gasoline summary), judged over 5 seconds once 11 V are present. Bosch rates its PDE pumps for the 12 V network with integrated electronics and selective error feedback to the vehicle. Suspects are a blown fuse, a relay with worn contacts, a loose ground, corroded terminals or a weak battery; a voltage-drop test with the pump running reveals hidden resistance. The pump may stop or run reduced, so the served circuit is undercooled.
- What you may notice
- Warning lamp on
- Pump stops intermittently, often with other low-voltage faults
- Reduced cooling of the served component
- Likely causes
- LikelyBlown fuse or relay with burnt contacts in the pump feed
- PossibleLoose or corroded ground of the pump
- PossibleWeak 12 V battery or charging fault
- RareResistance in feed wire or connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €10 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.