P2DDEFuel Injection Quantity D Lower Than Expected
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2DDE covers a fourth injection path, D, delivering too little fuel. The letter is assigned by the manufacturer; no one documents this code openly. CARB section 1968.2 (f)(4.2.2) sets two ways to catch it: either the shortfall is detected before emissions pass the malfunction threshold, or, where no injection fault can push emissions that high, once the control has used up its range and the commanded quantity cannot be reached. Since 2013 the monitor must also count how often it runs. Ford's diesels turn the global version of this finding into a lean code, P0171, below a fueling error of -0.15. Look first at the injectors of group D, then at fuel supply and the air and lambda signals. P2DDF is too much in D.
- What you may notice
- Check engine light on
- Lack of power
- Occasional stumbling or misfire-like running
- Likely causes
- LikelyInjectors of group D blocked or worn
- PossibleFuel supply weak (pump, filter, rail pressure)
- PossibleAir mass or lambda signal inaccurate
- 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: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.