P025D

Code

LAND ROVER P — Powertrain

Fuel pump control unit - High circuit p0261 Cylinder 1 injector low system p0262 Cylinder 1 injector high system p0263 Cylinder 1 contribution / balance p0264 Cylinder 2 low injector Circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 8 EN: 15 RU: 15

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wiring in fuel pump high-side circuit
Failed fuel pump control module (FP control unit)
Faulty fuel pump or excessive pump current draw
Fuel pump relay, fuse, or connector corrosion/intermittent connection
Poor battery voltage or power supply to control module
Faulty PCM/BCM driver or ground affecting pump control

Symptoms

Engine may crank but not start, or hard start
Intermittent or no fuel pressure / weak fuel delivery
Stalling or poor idle under load
Multiple related DTCs present (fuel pump and injector driver codes)
Fuel pump may run continuously or not at all
Possible fuel smell at connector or evidence of leakage/corrosion

What to check

Read and record all stored/active DTCs and freeze-frame data with a scan tool
Check battery voltage at rest and during cranking (should be ≈12–14V)
Inspect fuses, pump relay, and related fusebox connectors for damage/corrosion
Visual inspection of fuel pump module connector, wiring harness, and ground points
Backprobe fuel pump power and control pins to measure voltage and observe while cranking/engine running
Measure fuel pressure and compare to specification

Signal parameters

Battery supply voltage to pump/control module: typically ≈12–14 V (key on / crank)
Control module high-side feed: switched high-current supply; expected continuity to pump, near battery voltage when activated
Pump current draw (typical range): often 3–10 A (varies by vehicle and pump type) — compare to spec
Control signal from PCM/BCM to pump control module: duty cycle or enable (0–12 V logic-level or ground-switch depending on architecture)
Injector driver balance data (for related P026x codes): cylinder contribution values reported by PCM (compare cylinders)

Diagnostic algorithm

Connect a capable scan tool. Read and record P025D and all other stored/active codes (include P0261–P0264 if present). Note freeze-frame and live PIDs (fuel pressure, battery voltage, pump command).
Visually inspect fuse, pump relay, in-line fusible links and connector at fuel tank for corrosion, damage or loose pins. Repair or reseat connectors as needed.
With key on, measure voltage at fuel pump power pin at the tank connector. Confirm presence of battery voltage when pump is commanded. If absent, trace supply back to relay/fuse/control module.
Check ground integrity for pump and control module. Clean and secure ground points. Poor ground can mimic high-circuit faults.
Measure pump current draw while cranking/engine running using a clamp meter on the high-current feed. Compare to expected range. High draw indicates internal pump fault or short; very low/no draw indicates open circuit or failed pump.
Inspect and test fuel pump control module wiring for opens/shorts to battery, ignition, and pcm/ground. Repair any damaged wires. Wiggle-test harness while monitoring live signals for intermittent faults.
If available, perform an actuator/bi-directional test to command the pump and observe voltage/current response. If module does not respond correctly, consider substituting a known-good module to verify.
For associated injector DTCs (P0261–P0264), check injector resistances, driver outputs at PCM and shared power/ground. Cylinder contribution faults can indicate electrical supply or PCM/driver problems rather than mechanical injector failure.
After repairs, clear codes, perform a road/bench test and re-scan to confirm the fault does not return. Monitor fuel pressure and pump operation under load.
Safety note: relieve fuel system pressure and disconnect the battery when performing in-tank electrical work. Follow manufacturer procedures for handling fuel system components.

Likely causes

Corroded/loose connector at fuel pump or control module
Open/shorted high-current feed (broken wire in harness to tank)
Failed fuel pump control module electronics
Stuck or internally shorted fuel pump drawing excessive current
Shared ground or supply fault causing multiple circuit DTCs

Fault status

⚠️ Status

P025D — Fuel pump control unit high circuit: indicates abnormal high-side circuit condition or wiring fault to the fuel pump control module. May cause low/no fuel pressure or trigger related injector contribution faults.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

Repair manuals

Manual library for LAND ROVER

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

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email

P025D — Fuel pump control unit - High circuit p0261 Cylinder 1 injector low system p0262 Cylinder 1 injector high system p0263 Cylinder 1 contribution / balance p0264 Cylinder 2 low injector Circuit