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Home / DTC / P0628 — Fuel Pump A Control Circuit Low

P0628 — Fuel Pump A Control Circuit Low

Detailed page for trouble code P0628.

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P0628

Generic P — Powertrain

Fuel Pump A Control Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 27 EN: 80 RU: 42
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in fuel pump control wiring (open to supply or short to ground)
  • Blown fuse or faulty fuel pump relay
  • Poor battery voltage or weak battery/poor main power connection
  • Corroded/loose connector at pump, relay, fuse block or PCM
  • Failed fuel pump driver/module or integrated fuel pump control unit
  • Failed fuel pump (excessive current draw or internal short)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Engine cranks but will not start or hard starting
  • Intermittent stalling or no-start condition
  • Reduced or no fuel pressure at fuel rail
  • Fuel pump not audible from tank when key is turned to ON
  • Possible limp-home mode or reduced performance

What to check

  • Read and record freeze frame and all stored codes; note pending codes
  • Visual inspection of battery terminals, main fuses and grounds
  • Inspect fuse(s) and relay(s) for fuel pump circuit; replace if doubtful
  • Visual check of wiring and connectors for corrosion, damage, loose pins
  • Backprobe fuel pump control connector and PCM connector with key ON and cranking
  • Measure battery voltage at pump and at PCM power/ground pins

Signal parameters

  • Control circuit inactive: near 0 V (or open) depending on design
  • Control circuit active: near battery voltage (11–14 V) if high-side switched, or 0–1 V if low-side ground-switched (design dependent)
  • Acceptable drive signal: battery voltage present when pump commanded ON (Key ON/Crank) or a PWM waveform — frequency and duty vary by vehicle
  • Low/abnormal reading: stable voltage below expected threshold (commonly
  • Excessive current: typical pump draw often 4–15 A (varies by pump); significantly higher indicates pump or short

Diagnostic algorithm

  1. Retrieve freeze frame, note conditions when code set. Clear codes and attempt to reproduce.
  2. With key ON (engine OFF), listen for pump or backprobe pump power terminal; if no sound, proceed to electrical checks.
  3. Check battery voltage and main grounds. Repair any low-voltage or poor ground conditions before further tests.
  4. Inspect/replace relevant fuse(s) and relay(s) for pump circuit. Swap a known-good relay if available to test.
  5. Backprobe fuel pump power and control terminals: measure voltage at ON command (key ON/crank) and during engine run. Compare to expected (near battery or expected PWM).
  6. If no voltage at pump but PCM output is commanded, check continuity from PCM to pump and for shorts to ground/power. Repair wiring or connectors as needed.
  7. If wiring and connectors are good but pump receives correct command yet no pump operation or low pressure, measure pump current to confirm pump health; bench-test or ground supply to confirm pump operation.
  8. If pump/function tests fail only at the driver stage and wiring/pump good, suspect fuel pump driver/module. If driver is integrated in PCM, consider PCM failure only after excluding wiring and components.
  9. Use an oscilloscope to inspect waveform if circuit uses PWM to detect intermittent/fast faults not visible with DVM.
  10. After repairs, clear codes and verify repair by re-running tests and confirming no recurrence and correct fuel pressure/operation.

Likely causes

  • Corroded/poor connector at in-tank pump module or pump module harness
  • Failed fuel pump control module or internal driver transistor
  • Blown fuse or failed relay in pump supply/driver circuit
  • Open/grounded control wire between PCM and pump driver
  • Low battery or poor chassis/engine ground causing low circuit voltage

Fault status

⚠️ Status
Fuel Pump A Control Circuit Low — PCM detects low or missing voltage/signal on fuel pump control output; MIL set. Possible loss of fuel pump operation or reduced fuel pressure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

P0627 P0230 P0231 P0232 P0620
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Code

P0628

HUMMER P — Powertrain

Fuel Pump Relay Control Circuit Low Voltage

Brand: HUMMER
Type: P — Powertrain
Views: UK: 10 EN: 34 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in fuel pump control wiring (open to supply or short to ground)
  • Blown fuse or faulty fuel pump relay
  • Poor battery voltage or weak battery/poor main power connection
  • Corroded/loose connector at pump, relay, fuse block or PCM
  • Failed fuel pump driver/module or integrated fuel pump control unit
  • Failed fuel pump (excessive current draw or internal short)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Engine cranks but will not start or hard starting
  • Intermittent stalling or no-start condition
  • Reduced or no fuel pressure at fuel rail
  • Fuel pump not audible from tank when key is turned to ON
  • Possible limp-home mode or reduced performance

What to check

  • Read and record freeze frame and all stored codes; note pending codes
  • Visual inspection of battery terminals, main fuses and grounds
  • Inspect fuse(s) and relay(s) for fuel pump circuit; replace if doubtful
  • Visual check of wiring and connectors for corrosion, damage, loose pins
  • Backprobe fuel pump control connector and PCM connector with key ON and cranking
  • Measure battery voltage at pump and at PCM power/ground pins

Signal parameters

  • Control circuit inactive: near 0 V (or open) depending on design
  • Control circuit active: near battery voltage (11–14 V) if high-side switched, or 0–1 V if low-side ground-switched (design dependent)
  • Acceptable drive signal: battery voltage present when pump commanded ON (Key ON/Crank) or a PWM waveform — frequency and duty vary by vehicle
  • Low/abnormal reading: stable voltage below expected threshold (commonly
  • Excessive current: typical pump draw often 4–15 A (varies by pump); significantly higher indicates pump or short

Diagnostic algorithm

  1. Retrieve freeze frame, note conditions when code set. Clear codes and attempt to reproduce.
  2. With key ON (engine OFF), listen for pump or backprobe pump power terminal; if no sound, proceed to electrical checks.
  3. Check battery voltage and main grounds. Repair any low-voltage or poor ground conditions before further tests.
  4. Inspect/replace relevant fuse(s) and relay(s) for pump circuit. Swap a known-good relay if available to test.
  5. Backprobe fuel pump power and control terminals: measure voltage at ON command (key ON/crank) and during engine run. Compare to expected (near battery or expected PWM).
  6. If no voltage at pump but PCM output is commanded, check continuity from PCM to pump and for shorts to ground/power. Repair wiring or connectors as needed.
  7. If wiring and connectors are good but pump receives correct command yet no pump operation or low pressure, measure pump current to confirm pump health; bench-test or ground supply to confirm pump operation.
  8. If pump/function tests fail only at the driver stage and wiring/pump good, suspect fuel pump driver/module. If driver is integrated in PCM, consider PCM failure only after excluding wiring and components.
  9. Use an oscilloscope to inspect waveform if circuit uses PWM to detect intermittent/fast faults not visible with DVM.
  10. After repairs, clear codes and verify repair by re-running tests and confirming no recurrence and correct fuel pressure/operation.

Likely causes

  • Corroded/poor connector at in-tank pump module or pump module harness
  • Failed fuel pump control module or internal driver transistor
  • Blown fuse or failed relay in pump supply/driver circuit
  • Open/grounded control wire between PCM and pump driver
  • Low battery or poor chassis/engine ground causing low circuit voltage

Fault status

⚠️ Status
Fuel Pump A Control Circuit Low — PCM detects low or missing voltage/signal on fuel pump control output; MIL set. Possible loss of fuel pump operation or reduced fuel pressure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

P0627 P0230 P0231 P0232 P0620
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0628

LAND ROVER P — Powertrain

Fuel Pump A Control - Low Circuit

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 7 EN: 19 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in fuel pump control wiring (open to supply or short to ground)
  • Blown fuse or faulty fuel pump relay
  • Poor battery voltage or weak battery/poor main power connection
  • Corroded/loose connector at pump, relay, fuse block or PCM
  • Failed fuel pump driver/module or integrated fuel pump control unit
  • Failed fuel pump (excessive current draw or internal short)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Engine cranks but will not start or hard starting
  • Intermittent stalling or no-start condition
  • Reduced or no fuel pressure at fuel rail
  • Fuel pump not audible from tank when key is turned to ON
  • Possible limp-home mode or reduced performance

What to check

  • Read and record freeze frame and all stored codes; note pending codes
  • Visual inspection of battery terminals, main fuses and grounds
  • Inspect fuse(s) and relay(s) for fuel pump circuit; replace if doubtful
  • Visual check of wiring and connectors for corrosion, damage, loose pins
  • Backprobe fuel pump control connector and PCM connector with key ON and cranking
  • Measure battery voltage at pump and at PCM power/ground pins

Signal parameters

  • Control circuit inactive: near 0 V (or open) depending on design
  • Control circuit active: near battery voltage (11–14 V) if high-side switched, or 0–1 V if low-side ground-switched (design dependent)
  • Acceptable drive signal: battery voltage present when pump commanded ON (Key ON/Crank) or a PWM waveform — frequency and duty vary by vehicle
  • Low/abnormal reading: stable voltage below expected threshold (commonly
  • Excessive current: typical pump draw often 4–15 A (varies by pump); significantly higher indicates pump or short

Diagnostic algorithm

  1. Retrieve freeze frame, note conditions when code set. Clear codes and attempt to reproduce.
  2. With key ON (engine OFF), listen for pump or backprobe pump power terminal; if no sound, proceed to electrical checks.
  3. Check battery voltage and main grounds. Repair any low-voltage or poor ground conditions before further tests.
  4. Inspect/replace relevant fuse(s) and relay(s) for pump circuit. Swap a known-good relay if available to test.
  5. Backprobe fuel pump power and control terminals: measure voltage at ON command (key ON/crank) and during engine run. Compare to expected (near battery or expected PWM).
  6. If no voltage at pump but PCM output is commanded, check continuity from PCM to pump and for shorts to ground/power. Repair wiring or connectors as needed.
  7. If wiring and connectors are good but pump receives correct command yet no pump operation or low pressure, measure pump current to confirm pump health; bench-test or ground supply to confirm pump operation.
  8. If pump/function tests fail only at the driver stage and wiring/pump good, suspect fuel pump driver/module. If driver is integrated in PCM, consider PCM failure only after excluding wiring and components.
  9. Use an oscilloscope to inspect waveform if circuit uses PWM to detect intermittent/fast faults not visible with DVM.
  10. After repairs, clear codes and verify repair by re-running tests and confirming no recurrence and correct fuel pressure/operation.

Likely causes

  • Corroded/poor connector at in-tank pump module or pump module harness
  • Failed fuel pump control module or internal driver transistor
  • Blown fuse or failed relay in pump supply/driver circuit
  • Open/grounded control wire between PCM and pump driver
  • Low battery or poor chassis/engine ground causing low circuit voltage

Fault status

⚠️ Status
Fuel Pump A Control Circuit Low — PCM detects low or missing voltage/signal on fuel pump control output; MIL set. Possible loss of fuel pump operation or reduced fuel pressure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

P0627 P0230 P0231 P0232 P0620
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Workshop Manual
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Short description

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199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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Code

P0628

MITSUBISHI P — Powertrain

Suction control valve low

Brand: MITSUBISHI
Type: P — Powertrain
Views: UK: 10 EN: 38 RU: 21
AI status
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Page language: EN

Causes

  • Open or short in fuel pump control wiring (open to supply or short to ground)
  • Blown fuse or faulty fuel pump relay
  • Poor battery voltage or weak battery/poor main power connection
  • Corroded/loose connector at pump, relay, fuse block or PCM
  • Failed fuel pump driver/module or integrated fuel pump control unit
  • Failed fuel pump (excessive current draw or internal short)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Engine cranks but will not start or hard starting
  • Intermittent stalling or no-start condition
  • Reduced or no fuel pressure at fuel rail
  • Fuel pump not audible from tank when key is turned to ON
  • Possible limp-home mode or reduced performance

What to check

  • Read and record freeze frame and all stored codes; note pending codes
  • Visual inspection of battery terminals, main fuses and grounds
  • Inspect fuse(s) and relay(s) for fuel pump circuit; replace if doubtful
  • Visual check of wiring and connectors for corrosion, damage, loose pins
  • Backprobe fuel pump control connector and PCM connector with key ON and cranking
  • Measure battery voltage at pump and at PCM power/ground pins

Signal parameters

  • Control circuit inactive: near 0 V (or open) depending on design
  • Control circuit active: near battery voltage (11–14 V) if high-side switched, or 0–1 V if low-side ground-switched (design dependent)
  • Acceptable drive signal: battery voltage present when pump commanded ON (Key ON/Crank) or a PWM waveform — frequency and duty vary by vehicle
  • Low/abnormal reading: stable voltage below expected threshold (commonly
  • Excessive current: typical pump draw often 4–15 A (varies by pump); significantly higher indicates pump or short

Diagnostic algorithm

  1. Retrieve freeze frame, note conditions when code set. Clear codes and attempt to reproduce.
  2. With key ON (engine OFF), listen for pump or backprobe pump power terminal; if no sound, proceed to electrical checks.
  3. Check battery voltage and main grounds. Repair any low-voltage or poor ground conditions before further tests.
  4. Inspect/replace relevant fuse(s) and relay(s) for pump circuit. Swap a known-good relay if available to test.
  5. Backprobe fuel pump power and control terminals: measure voltage at ON command (key ON/crank) and during engine run. Compare to expected (near battery or expected PWM).
  6. If no voltage at pump but PCM output is commanded, check continuity from PCM to pump and for shorts to ground/power. Repair wiring or connectors as needed.
  7. If wiring and connectors are good but pump receives correct command yet no pump operation or low pressure, measure pump current to confirm pump health; bench-test or ground supply to confirm pump operation.
  8. If pump/function tests fail only at the driver stage and wiring/pump good, suspect fuel pump driver/module. If driver is integrated in PCM, consider PCM failure only after excluding wiring and components.
  9. Use an oscilloscope to inspect waveform if circuit uses PWM to detect intermittent/fast faults not visible with DVM.
  10. After repairs, clear codes and verify repair by re-running tests and confirming no recurrence and correct fuel pressure/operation.

Likely causes

  • Corroded/poor connector at in-tank pump module or pump module harness
  • Failed fuel pump control module or internal driver transistor
  • Blown fuse or failed relay in pump supply/driver circuit
  • Open/grounded control wire between PCM and pump driver
  • Low battery or poor chassis/engine ground causing low circuit voltage

Fault status

⚠️ Status
Fuel Pump A Control Circuit Low — PCM detects low or missing voltage/signal on fuel pump control output; MIL set. Possible loss of fuel pump operation or reduced fuel pressure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

P0627 P0230 P0231 P0232 P0620
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