P2A18Injection Pump Fuel Metering Control D Low (Cam/Rotor/Injector)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A18 indicates a low reading in the control circuit of metering element D: the module detects that the output stays near ground or carries too little current. Typical triggers are a short to ground in the harness, a corroded connector pin or, with low-side drivers, an interrupted lead. Since the D range requires a fourth individually driven element, the code belongs to multi-element systems such as engines with several cam-actuated pumping units; Volvo bulletins mention element D only for its range/performance code. P2A18 itself is not described by any manufacturer. As a reference, Saab's V6 diesel of 2002 sets P0258 when the shared supply of its two pump valves has a ground fault or opens for over 1.05 s and then limits power. The high-side partner is P2A19.
- What you may notice
- Check engine light on
- Limited power or limp mode
- Fault may come and go with vibration or moisture
- Likely causes
- LikelyHarness of element D shorted to ground
- PossibleCorroded or spread connector pin at element D
- PossibleInterrupted lead on the switched side of element D
- RareDefective driver in the engine control module
- 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 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.