P2508ECM/PCM Power Input Signal High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2508 is set when a supply input of the engine module reads above its permitted range. Ford documents it for the 2023 6.7 L Power Stroke diesel: the module checks its internal 5 V supply rail and flags P2508 once that rail exceeds 5.5 V, with continuous monitoring, roughly 5 s to mature, and the module awake (key on, running or after-run). The same group also blocks the reductant quality sensor test while P2507 or P2508 is present. On the 2014 BOSS 302S module Ford gives P2508 an M in the indicator column. A raised internal rail suggests a regulator fault inside the module or an external short to a higher voltage. P0563 reports excessive system voltage instead, P06A6 a sensor reference out of range. P2507 is the low partner.
- What you may notice
- Check engine lamp
- Other diagnostics such as the DEF quality test suspended
- Erratic sensor values possible
- Likely causes
- LikelyInternal 5 V regulator of the engine module defective
- PossibleSupply or sensor wire shorted to battery voltage
- RareOvervoltage from charging fault or jump start
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.