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Home / DTC / P2635 — Fuel Pump A Low Flow/Performance

P2635 — Fuel Pump A Low Flow/Performance

Detailed page for trouble code P2635.

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P2635

Generic P — Powertrain

Fuel Pump A Low Flow/Performance

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

Causes

  • Weak or failing fuel pump (mechanical/electrical)
  • Clogged fuel filter or inlet screen (pump sock)
  • Restricted or collapsed fuel line or kinked hose
  • Low supply voltage to the pump (bad battery, poor ground, corroded connector)
  • Faulty fuel pump control module or driver circuit
  • Bad fuel pump relay or blown fuse

Symptoms

  • Check Engine Light (MIL) illuminated
  • Hard starting or long crank times
  • Engine hesitation, loss of power or stumble under load/acceleration
  • Misfires during high-load conditions
  • Stalling at idle or while driving
  • Fuel pressure lower than expected on gauge

What to check

  • Read freeze frame and live data with a capable scan tool; record fuel rail pressure, pump duty or command, and fuel trim values
  • Visually inspect fuel pump wiring, connectors, relay, fuse, and ground for corrosion, damage, or looseness
  • Check battery voltage and charge; verify adequate voltage at pump connector during cranking and run
  • Measure static and running fuel rail pressure with a calibrated gauge and compare to OEM spec
  • Check fuel pressure drop under load or during cranking; inspect for restricted lines or collapsed hoses
  • Inspect/replace fuel filter and inlet sock if service interval or contamination suspected

Signal parameters

  • Fuel rail pressure (psi or bar) - idle, cranking, and commanded
  • Fuel pump duty cycle or command (%) from PCM (if applicable)
  • Pump supply voltage at connector (V)
  • Pump current draw (A)
  • Fuel pressure sensor voltage or frequency (V)
  • Long and short term fuel trim (%)

Diagnostic algorithm

  1. Retrieve DTC, freeze frame, and any related codes. Note conditions when code set (temp, load, RPM, time since start).
  2. Perform a visual inspection of fuel system wiring, connectors, relay, fuse, and pump ground. Repair any damaged or corroded connections.
  3. Verify battery state of charge and measure voltage at the fuel pump connector with the key ON and while cranking. Voltage should be within specification.
  4. Measure static (key ON, engine OFF) and dynamic (engine running) fuel pressure with a calibrated gauge. Compare to manufacturer specs and note pressure under load/acceleration.
  5. If pressure is low, inspect and replace the fuel filter and inlet sock if serviceable; re-test pressure. A clogged filter often restores flow when replaced.
  6. Measure pump current draw. Low current can indicate an electrical open or bad motor; high current can indicate a seized or failing pump.
  7. If electrical supply and filter are good but flow remains low, bench test or temporarily install a known-good pump to confirm pump condition.
  8. Inspect tank for contamination or debris and the pickup for restriction; flush or replace tank components if contaminated.
  9. Check fuel pump control module/driver and associated relays/fuses. Test control signals from PCM with a scope or lab-quality scan tool if required.
  10. After repairs, clear codes and perform a road test under the same conditions that set the code. Confirm pressure, flow, and absence of returned DTCs.

Likely causes

  • Clogged fuel filter or pickup sock reducing flow
  • Deteriorating fuel pump with reduced output
  • Poor electrical supply to pump (high resistance in wiring/ground)
  • Faulty pump control module or relay
  • Contamination in tank restricting pump inlet

Fault status

⚠️ Status
PCM detected Fuel Pump A low flow/performance. Fuel delivery did not meet expected parameters; MIL may be illuminated and a freeze frame stored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

P2635

LAND ROVER P — Powertrain

Fuel pump Low flow/performance

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

Causes

  • Weak or failing fuel pump (mechanical/electrical)
  • Clogged fuel filter or inlet screen (pump sock)
  • Restricted or collapsed fuel line or kinked hose
  • Low supply voltage to the pump (bad battery, poor ground, corroded connector)
  • Faulty fuel pump control module or driver circuit
  • Bad fuel pump relay or blown fuse

Symptoms

  • Check Engine Light (MIL) illuminated
  • Hard starting or long crank times
  • Engine hesitation, loss of power or stumble under load/acceleration
  • Misfires during high-load conditions
  • Stalling at idle or while driving
  • Fuel pressure lower than expected on gauge

What to check

  • Read freeze frame and live data with a capable scan tool; record fuel rail pressure, pump duty or command, and fuel trim values
  • Visually inspect fuel pump wiring, connectors, relay, fuse, and ground for corrosion, damage, or looseness
  • Check battery voltage and charge; verify adequate voltage at pump connector during cranking and run
  • Measure static and running fuel rail pressure with a calibrated gauge and compare to OEM spec
  • Check fuel pressure drop under load or during cranking; inspect for restricted lines or collapsed hoses
  • Inspect/replace fuel filter and inlet sock if service interval or contamination suspected

Signal parameters

  • Fuel rail pressure (psi or bar) - idle, cranking, and commanded
  • Fuel pump duty cycle or command (%) from PCM (if applicable)
  • Pump supply voltage at connector (V)
  • Pump current draw (A)
  • Fuel pressure sensor voltage or frequency (V)
  • Long and short term fuel trim (%)

Diagnostic algorithm

  1. Retrieve DTC, freeze frame, and any related codes. Note conditions when code set (temp, load, RPM, time since start).
  2. Perform a visual inspection of fuel system wiring, connectors, relay, fuse, and pump ground. Repair any damaged or corroded connections.
  3. Verify battery state of charge and measure voltage at the fuel pump connector with the key ON and while cranking. Voltage should be within specification.
  4. Measure static (key ON, engine OFF) and dynamic (engine running) fuel pressure with a calibrated gauge. Compare to manufacturer specs and note pressure under load/acceleration.
  5. If pressure is low, inspect and replace the fuel filter and inlet sock if serviceable; re-test pressure. A clogged filter often restores flow when replaced.
  6. Measure pump current draw. Low current can indicate an electrical open or bad motor; high current can indicate a seized or failing pump.
  7. If electrical supply and filter are good but flow remains low, bench test or temporarily install a known-good pump to confirm pump condition.
  8. Inspect tank for contamination or debris and the pickup for restriction; flush or replace tank components if contaminated.
  9. Check fuel pump control module/driver and associated relays/fuses. Test control signals from PCM with a scope or lab-quality scan tool if required.
  10. After repairs, clear codes and perform a road test under the same conditions that set the code. Confirm pressure, flow, and absence of returned DTCs.

Likely causes

  • Clogged fuel filter or pickup sock reducing flow
  • Deteriorating fuel pump with reduced output
  • Poor electrical supply to pump (high resistance in wiring/ground)
  • Faulty pump control module or relay
  • Contamination in tank restricting pump inlet

Fault status

⚠️ Status
PCM detected Fuel Pump A low flow/performance. Fuel delivery did not meet expected parameters; MIL may be illuminated and a freeze frame stored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0087 P0190 P0191 P0230 P0627
413

Browse 413 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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