P2D08Motor Electronics Coolant Pump B 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
- P2D08 watches the line that actually powers motor electronics coolant pump B, typically a fused 12 V feed plus ground: the voltage there is too low, too high or absent. The control-line faults of the same pump have their own codes, P0B38 to P0B3A, so P2D08 sends the search to fuses, relays, splices and the ground point rather than to the signal wire. Because many modules share the 12 V net, look for other low-voltage codes and check the auxiliary battery and DC/DC converter first. No manufacturer publicly documents P2D08. Ford's 2024 summary shows the same fault type (1C, supply voltage out of range) for its auxiliary pumps, with a 5 s check enabled from 11 V; the 2020 Ford hybrids carry the pump A version, P2D03. Pump B then fails to cool its electronics and power may be reduced.
- What you may notice
- Warning lamp on
- Pump B works only intermittently
- Additional voltage codes in neighbouring modules
- Likely causes
- LikelyCorroded connector, loose terminal or poor ground at pump B
- PossibleBlown fuse or faulty relay in the pump B feed
- PossibleWeak 12 V battery or DC/DC converter delivering too little voltage
- RareChafed supply wire with intermittent contact
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.