P0257

Code

LAND ROVER P — Powertrain

Fuel measurement control of injection pump B - range / performance

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 15 EN: 32 RU: 19

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Page language: EN

Causes

Open, short or high-resistance wiring/connectors to injection pump B or its actuator
Faulty fuel metering actuator/solenoid on injection pump B
Faulty fuel rail pressure sensor or other related sensor feeding the ECM
Low or inconsistent fuel supply pressure (clogged filter, lift pump failure, air ingress)
Internal mechanical failure or wear in injection pump B
Poor battery/charging voltage or bad ground at pump/ECM

Symptoms

Malfunction Indicator Lamp (MIL) / Check Engine Light on
Engine limp mode or reduced power
Hard starting, extended cranking or no-start conditions
Rough idle, misfire, or uneven running under load
Reduced fuel economy and increased smoke/soot from exhaust
Intermittent loss of power or surging

What to check

Use a diagnostic scan tool: read freeze frame data and all stored codes, including pending codes and related fuel/system codes
Compare commanded fuel metering (ECM command) vs actual feedback (rail pressure or actuator response) in live data
Inspect connectors, wiring harness and ground for corrosion, damage, or water ingress at injection pump B and ECM
Check battery voltage and charging system while cranking and during load; ensure solid ground connections
Check fuel supply: condition of fuel filter, presence of air in fuel lines, and fuel lift pump operation
Measure fuel rail pressure at idle and under load; observe pressure response to ECM commands

Signal parameters

Command signal to metering actuator: typically a PWM/duty-cycle or 0–5V control signal from ECM (0–100% duty)
Actuator electrical resistance: verify coil/solenoid resistance per factory spec (check for open/short)
Fuel rail pressure target vs actual: pressure should respond proportionally to metering commands (specific psi/bar varies by model)
Supply voltage at pump connector: nominal battery voltage (approx. 11–14.5 V while cranking/running)
No parasitic short to ground or to permanent 12V on control circuit when actuator is not commanded

Diagnostic algorithm

Retrieve all codes and freeze frame data with a good scan tool; note related fuel/pressure codes (P0190/P0193/P0087 etc.). Clear codes and attempt to reproduce.
Visually inspect wiring and connectors at injection pump B and ECM; repair any corrosion, crushed wires, or loose pins.
With key on engine off, measure supply voltage and ground at pump connector; record. Check actuator resistance against service values.
Start engine and monitor live data: commanded metering vs rail pressure/feedback. Note if pump B fails to respond to ECM commands or lags.
Use bidirectional control to operate the metering actuator while monitoring fuel pressure and current draw. If actuator does not move or current is out of range, suspect actuator/pump.
Check fuel supply system: replace clogged fuel filter, verify lift pump operation, and bleed air from system if present.
If wiring and fuel supply are good but actuator/pump does not respond, consider replacing the metering actuator or injection pump B. Follow manufacturer procedures for removal, replacement and any required pump/ECM calibration or adaptation.
After repairs, clear codes and perform road test under varying loads; confirm code does not return and performance is normal.

Likely causes

Corroded/damaged connector or pin at injection pump B
Failed fuel metering solenoid/actuator on pump B
Fuel pressure sensor reading inconsistent with commanded metering
Contaminated fuel or clogged fuel filter causing erratic metering
Internal pump wear causing inability to meet commanded fuel volume

Fault status

⚠️ Status

Fuel metering control for injection pump B out of range/performance. ECM detected that commanded fuel metering and actual response do not match; possible electrical, sensor, fuel supply or pump mechanical fault.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 2-6 hours

Repair manuals

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P0257 — Fuel measurement control of injection pump B - range / performance