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Home / DTC / P05EF — Reductant Pump Supply Voltage Circuit Low

P05EF — Reductant Pump Supply Voltage Circuit Low

Detailed page for trouble code P05EF.

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Code

P05EF

Generic P — Powertrain

Reductant Pump Supply Voltage Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 7 EN: 20 RU: 10
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Page language: EN

Causes

  • Low battery or poor battery condition
  • Blown or corroded fuse in pump power circuit
  • Open or high-resistance wiring or connector (power or ground)
  • Faulty pump motor with high internal resistance or partial short
  • Faulty relay or power module that supplies the pump
  • Control module output or driver fault

Symptoms

  • Malfunction Indicator Lamp (MIL) or DTC P05EF stored
  • Reductant/SCR system warning on dash (DEF/AdBlue warning)
  • Reduced or disabled SCR dosing, possible engine derate or NOx-related limp mode
  • No audible pump noise when pump should be running
  • Intermittent operation of the reductant pump
  • Poor emissions performance or failed emissions readiness

What to check

  • Read freeze frame and live data with a scan tool: pump commanded state, pump voltage, any related reductant codes
  • Check battery voltage and health (engine off and while cranking)
  • Visually inspect fuses, relays and fusible links for the reductant pump circuit
  • Inspect pump connector for corrosion, broken pins, water ingress, or contamination
  • Check wiring harness for chafing, pinches, or repairs along the route between pump and controller/battery
  • Listen for pump operation when commanded by scan tool (may be intermittent)

Signal parameters

  • Expected pump supply voltage: approximately battery voltage when pump is commanded (typical range ~11–15 V depending on system state)
  • Key ON, pump not commanded: supply may be battery voltage (or open depending on relay design)
  • Pump commanded ON: voltage should remain near battery voltage and not drop significantly
  • Pump current draw: should show a stable running current (manufacturer-specific); near zero if pump not running or very high if seized/shorted
  • Noisy or fluctuating voltage under command suggests high resistance connection, weak battery, or failing pump

Diagnostic algorithm

  1. Retrieve and record freeze frame data and related reductant system codes. Note environmental and operating conditions when the code set.
  2. Verify battery state of charge and charging system health. Recharge or replace battery if voltage is low.
  3. Visually inspect fuses, relays and wiring for damage, corrosion or looseness. Replace any blown fuses and ensure proper relay seating.
  4. With ignition ON and engine OFF, use a scan tool to command the reductant pump ON while observing live voltage at the pump connector. Record voltage and behavior.
  5. If voltage at module/relay is good but low at pump, isolate wiring. Backprobe the pump connector and check voltage and ground while commanded to pinpoint voltage drop location.
  6. Measure pump current while commanded. If no current, check for open circuit (fuse, relay, connector). If excessive current, suspect seized or failing pump and inspect/replace pump.
  7. Bench-test the pump by supplying appropriate vehicle battery voltage directly to the pump (observe polarity and safety). If pump does not run or draws excessive current, replace pump.
  8. If wiring and pump are good, inspect and test the pump power relay and control module driver. Replace faulty relay or repair wiring; if module driver suspected, follow manufacturer procedures before replacing controller.
  9. After repairs, clear DTCs and perform functional test by commanding pump multiple cycles and verifying voltage/current and absence of code reappearance. Road/test as required for readiness.
  10. If intermittent, secure connectors, protect wiring from moisture/abrasion and re-test. Document repairs and retest emissions readiness.

Likely causes

  • Loose, corroded, or damaged battery negative or positive cable
  • Fuse for reductant pump blown or contacts corroded
  • Pump power or ground connector contaminated or pins pushed out
  • Reductant pump motor partially seized or drawing excessive current
  • Pump supply relay sticking or not closing fully
  • Wiring short to ground in pump supply circuit near chassis or pump

Fault status

⚠️ Status
Reductant pump supply voltage below expected threshold — low voltage detected on reductant pump power circuit
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P05E0 P05E1 P05E2 P20E0 P0627 P0628
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