B10C0

Code

LAND ROVER B — Body

Fuel pump power supply

Brand: LAND ROVER

Type: B — Body

Views: UK: 19 EN: 43 RU: 28

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Page language: EN

Causes

Blown fuse for fuel pump circuit
Faulty fuel pump relay or relay socket
Open or corroded wiring/connector between battery/relay/ECM and fuel pump
Faulty fuel pump motor with internal short or open
Poor ground at fuel pump or chassis ground corrosion
Faulty powertrain/BCM/PCM driver or module controlling pump supply

Symptoms

No fuel pressure or low fuel pressure on cranking/running
Engine cranks but does not start or stalls shortly after starting
Fuel pump does not run, or runs intermittently
Fuel pump audible noise abnormal or silent from the tank
MIL (check engine light) illuminated with related code(s)

What to check

Read and record all fault codes and freeze frame data from all modules
Verify battery voltage ≥12.4 V (engine off) and good charge state
Check fuel pump fuse(s) and fusible link(s) for continuity
Inspect fuel pump relay operation and swap with identical relay if available
Visually inspect pump connector, wiring harness, and chassis ground for corrosion, damage or water ingress
With key ON (do not crank), check for pump prime audible and listen at fuel tank

Signal parameters

Key ON / prime: brief application of battery voltage to pump supply (typical ≈ battery voltage)
Cranking/run: pump supply should be near battery voltage when commanded (typical ≈11–14.5 V)
PCM/BCM may use PWM control: duty cycle 0–100% and frequency typically in the low hundreds of Hz (model dependent)
Fuel pump current draw: typical running range varies by pump—commonly a few amps up to ~10–15 A for high-pressure pumps; significant deviation indicates pump fault or electrical short

Diagnostic algorithm

Secure vehicle: park, chock wheels, engage parking brake, wear safety glasses and follow fuel system safety precautions.
Scan: retrieve all related DTCs (including ECM/BCM). Note freeze frame and occurrence conditions.
Battery & fuses: confirm battery voltage and test continuity of pump fuse(s) and fusible links. Replace if blown and re-test. Do not repeatedly replace fuse without diagnosing cause.
Relay & power feed: check/operate fuel pump relay while monitoring voltage at relay feed and switched feed. Swap relay with known-good same-type relay if available.
Connector & harness inspection: inspect and gently wiggle harness from pump to relay/ECM while monitoring voltage for intermittent faults. Repair any damaged wiring or corroded pins.
Voltage measurement: back-probe pump power and ground with key ON and during cranking. Expect near-battery voltage when pump commanded. If no voltage, trace back to relay/PCM output.
Ground integrity: measure resistance from pump ground pin to chassis/battery negative; high resistance indicates poor ground—clean/repair ground connection.
Current draw and pump test: measure in-line current (amp clamp or fused ammeter). Excessive draw suggests internal short/worn brushes; no draw suggests open circuit. If suspect, bench-test pump by supplying controlled 12 V through a fused jumper to confirm operation.
Control module output: if wiring and pump are good but no command voltage, check PCM/BCM driver output for proper switching/PWM using oscilloscope or lab scope. Replace or reprogram module only after ruling out wiring and pump.
Repair and verify: repair wiring, connectors, relay, fuse, pump or module as required. Clear codes and perform function test and road test. Confirm code does not return.
Document repairs and retest for consistency with freeze frame conditions.

Likely causes

Blown fuse or failed fuel pump relay
Corroded or disconnected connector at the fuel pump
Open/short in the supply or ground wiring to the pump
Failed fuel pump motor (high current draw or open)

Fault status

⚠️ Status

Fuel pump power supply circuit fault detected (open/short/intermittent voltage) — check fuses, relay, wiring, pump and control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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B10C0 — Fuel pump power supply