P025C

Code

LAND ROVER P — Powertrain

Fuel pump control unit - Low system

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 13 EN: 28 RU: 44

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Page language: EN

Causes

Low or intermittent supply voltage to the pump control unit (blown fuse, bad relay, corroded connector)
High resistance or open wiring in pump power or ground circuits
Faulty fuel pump control module (FPCM) or PCM driver output
Failed or weak fuel pump (low current draw)
Poor ground at chassis or module mounting point
CAN/communication error between PCM and FPCM (if applicable)

Symptoms

MIL (Check Engine) illuminated with stored P025C
Fuel pump prime may be weak or absent on key-on
Low fuel rail pressure or inability to build required pressure
Hard starting, long cranks, intermittent stalls or loss of power
Poor acceleration or limp-home behavior
Possible abnormal fuel pump noise or silence from fuel tank area

What to check

Retrieve DTCs and freeze-frame data with a good scan tool; check for other related codes
Inspect battery state of charge and terminal condition; verify vehicle battery voltage (should be ~12.4–12.8 V at rest)
Visually inspect fuses, fusible links and fuel pump relay; wiggle test connectors at pump module and relay while monitoring system behavior
Inspect harness and connector at fuel pump control module and at the pump for corrosion, bent pins, water intrusion or damage
Check for CAN bus or communications errors to the pump control module (if equipped)
Measure supply voltage and ground at the pump control unit harness with key ON and during cranking

Signal parameters

Expected supply voltage at pump control unit: close to battery voltage — typically 11–14.5 V with engine running
Module ground: near 0.0 V (low resistance to chassis)
Pump current draw: varies by design; typical running current often in the low single-digit to low-double-digit amps (measure against manufacturer spec)
Control signal: PWM duty cycle or switched feed from FPCM/PCM — should be present and modulated as commanded (use oscilloscope)
Fuel rail/low-side pressure: compare measured pressure to manufacturer target during cranking and idle (varies by system; low-pressure side commonly a few bar for return systems)

Diagnostic algorithm

Read and record all stored codes and freeze-frame data; note conditions (temperature, load, battery voltage).
Verify battery health and voltage. Poor battery can cause spurious low-system faults.
Inspect fuses, relays and harness connectors related to fuel pump supply and control; repair any corrosion/damage.
With key ON, backprobe the pump control unit power and ground pins. Confirm battery voltage at the power pin and near 0 V at ground. If low, trace and repair supply/ground wiring.
Check communication to the pump control module on CAN (if applicable) and confirm the control module is recognized by the scan tool. Address any comms faults before further component replacement.
Measure pump current during prime and running conditions. Low or no current suggests open circuit, failed pump, or module output fault.
Measure fuel pressure during cranking and at idle with a calibrated gauge. If pressure is below spec, isolate whether electrical supply, module control or mechanical pump/strainer is the cause.
If supply and grounds are good but output signal is absent or incorrect, test/replace the fuel pump control module or repair PCM output as per manufacturer guidance. Check for available software updates or module reflashing requirements after replacement.
After repairs, clear codes and perform a full functional test including drive cycle and re-check for DTC reappearance.
If intermittent, perform wiggle and load tests on harnesses and rerun diagnostics; consider installing fuel tank inspection if necessary to access pump and module.

Likely causes

Corroded/loose connector or high-resistance wiring to pump control unit
Blown fuse or faulty fuel pump relay / power supply
Failed fuel pump motor or clogged strainer causing low current/low pressure
Faulty fuel pump control module or PCM driver output

Fault status

⚠️ Status

Fuel pump control unit: low system detected — supply, control signal, or pump output lower than expected; MIL set.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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P025C — Fuel pump control unit - Low system