Powertrain, generic (extended)

P2A18 Injection Pump Fuel Metering Control D Low (Cam/Rotor/Injector)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Harness of element D shorted to ground
Corroded or spread connector pin at element D
Interrupted lead on the switched side of element D
Defective driver in the engine control module

Symptoms

  • Check engine light on
  • Limited power or limp mode
  • Fault may come and go with vibration or moisture

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–1,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

injection pump metering dinjection pumpwiring harness

Related codes

P2A16P2A17P2A19P2A14P0258

References: law.cornell.edu, saabwisonline.com, saabwisonline.com.