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Home / DTC / P0627 — Fuel Pump A Control Circuit/Open

P0627 — Fuel Pump A Control Circuit/Open

Detailed page for trouble code P0627.

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P0627

Generic P — Powertrain

Fuel Pump A Control Circuit/Open

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in the fuel pump control circuit
  • Blown fuse or faulty fuel pump relay
  • Poor or corroded connector(s) at pump, relay, or module
  • Failed fuel pump (open motor or internal wiring)
  • Faulty fuel pump driver inside the PCM/ECM
  • Bad ground for fuel pump circuit or ECM ground

Symptoms

  • Malfunction indicator lamp (MIL) illuminated
  • No crank/no-start or hard starting
  • Engine stalls or runs intermittently
  • No audible fuel pump prime when key is turned to ON
  • Low or no fuel rail pressure

What to check

  • Scan for codes and note freeze frame and related codes
  • Verify ignition key ON — listen for fuel pump prime
  • Inspect fuses and fuel pump relay for continuity and correct operation
  • Visually inspect connectors and wiring for damage, corrosion, or disconnection
  • Backprobe fuel pump control and power circuits; measure voltage and continuity
  • Check fuel pump ground integrity at tank and ECM ground points

Signal parameters

  • Control signal: PCM typically provides a switched 0–12 V (or PWM) to pump relay or pump driver; expect near battery voltage when commanded (or a PWM waveform when applicable)
  • Open-circuit condition: infinite resistance between PCM control output and pump/relay input or no voltage present when commanded
  • Typical in-tank pump DC resistance: often roughly 0.2–5 ohms (varies by application) — refer to factory spec
  • Typical pump current draw: roughly 4–20 A under load (application dependent) — measure with clamp meter
  • Prime behavior: short key-ON prime (1–3 s) then full power when cranking — variation and frequency depend on vehicle design

Diagnostic algorithm

  1. Verify code and related codes with a scan tool; record freeze-frame data.
  2. Confirm the symptom: key ON — listen for pump prime; check fuel pressure with a gauge. If no prime and no pressure, proceed.
  3. Inspect fuses, fusible links and the fuel pump relay; swap with a known good relay if available and safe to do so.
  4. Visually inspect connectors at fuel pump module, relay and ECM for corrosion, bent pins or moisture; secure connectors.
  5. Backprobe the fuel pump power and control pins at the connector (or at relay output) while key ON and during cranking. Verify battery voltage on pump power feed and control signal from ECM. If power present but control absent, check relay coil feed and ECM output.
  6. Check continuity between ECM control pin and pump/relay control pin. Repair any open or high-resistance wiring.
  7. Measure pump motor DC resistance at tank; compare to spec. If open or out of range, remove and bench-test pump with direct battery power (observe current draw).
  8. Check ground circuits for low resistance to chassis/negative battery terminal; repair corroded or broken grounds.
  9. If wiring and pump test good but control signal is absent or stuck, consider ECM/PCM driver fault — confirm with manufacturer procedures before replacement.
  10. After repair, clear codes, verify pump operation, confirm correct fuel pressure, and perform a road test to ensure the fault does not return.

Likely causes

  • Connector disconnected or corroded at fuel pump module
  • Harness chafing or broken conductor between ECM and pump relay/module
  • Blown in-line fuse or relay contact failure
  • Failed in-tank pump motor (open winding)
  • ECM output transistor/controller for pump has failed

Fault status

⚠️ Status
Fuel Pump A Control Circuit/Open — The engine control module has detected an open or interrupted circuit in the fuel pump A control path. This can prevent the fuel pump from powering and cause no-start or stall conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
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Code

P0627

LAND ROVER P — Powertrain

Fuel Pump A Control - Circuit / Open

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in the fuel pump control circuit
  • Blown fuse or faulty fuel pump relay
  • Poor or corroded connector(s) at pump, relay, or module
  • Failed fuel pump (open motor or internal wiring)
  • Faulty fuel pump driver inside the PCM/ECM
  • Bad ground for fuel pump circuit or ECM ground

Symptoms

  • Malfunction indicator lamp (MIL) illuminated
  • No crank/no-start or hard starting
  • Engine stalls or runs intermittently
  • No audible fuel pump prime when key is turned to ON
  • Low or no fuel rail pressure

What to check

  • Scan for codes and note freeze frame and related codes
  • Verify ignition key ON — listen for fuel pump prime
  • Inspect fuses and fuel pump relay for continuity and correct operation
  • Visually inspect connectors and wiring for damage, corrosion, or disconnection
  • Backprobe fuel pump control and power circuits; measure voltage and continuity
  • Check fuel pump ground integrity at tank and ECM ground points

Signal parameters

  • Control signal: PCM typically provides a switched 0–12 V (or PWM) to pump relay or pump driver; expect near battery voltage when commanded (or a PWM waveform when applicable)
  • Open-circuit condition: infinite resistance between PCM control output and pump/relay input or no voltage present when commanded
  • Typical in-tank pump DC resistance: often roughly 0.2–5 ohms (varies by application) — refer to factory spec
  • Typical pump current draw: roughly 4–20 A under load (application dependent) — measure with clamp meter
  • Prime behavior: short key-ON prime (1–3 s) then full power when cranking — variation and frequency depend on vehicle design

Diagnostic algorithm

  1. Verify code and related codes with a scan tool; record freeze-frame data.
  2. Confirm the symptom: key ON — listen for pump prime; check fuel pressure with a gauge. If no prime and no pressure, proceed.
  3. Inspect fuses, fusible links and the fuel pump relay; swap with a known good relay if available and safe to do so.
  4. Visually inspect connectors at fuel pump module, relay and ECM for corrosion, bent pins or moisture; secure connectors.
  5. Backprobe the fuel pump power and control pins at the connector (or at relay output) while key ON and during cranking. Verify battery voltage on pump power feed and control signal from ECM. If power present but control absent, check relay coil feed and ECM output.
  6. Check continuity between ECM control pin and pump/relay control pin. Repair any open or high-resistance wiring.
  7. Measure pump motor DC resistance at tank; compare to spec. If open or out of range, remove and bench-test pump with direct battery power (observe current draw).
  8. Check ground circuits for low resistance to chassis/negative battery terminal; repair corroded or broken grounds.
  9. If wiring and pump test good but control signal is absent or stuck, consider ECM/PCM driver fault — confirm with manufacturer procedures before replacement.
  10. After repair, clear codes, verify pump operation, confirm correct fuel pressure, and perform a road test to ensure the fault does not return.

Likely causes

  • Connector disconnected or corroded at fuel pump module
  • Harness chafing or broken conductor between ECM and pump relay/module
  • Blown in-line fuse or relay contact failure
  • Failed in-tank pump motor (open winding)
  • ECM output transistor/controller for pump has failed

Fault status

⚠️ Status
Fuel Pump A Control Circuit/Open — The engine control module has detected an open or interrupted circuit in the fuel pump A control path. This can prevent the fuel pump from powering and cause no-start or stall conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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