P268B

Code

LAND ROVER P — Powertrain

Calibration of the high-pressure fuel pump not learned / programmed Cylinder

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 17 EN: 22 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

New or replaced high-pressure fuel pump not programmed with vehicle-specific calibration
Battery disconnect or low vehicle voltage during HPFP learn procedure
PCM/ECM software mismatch or missing calibration data
Corroded or damaged electrical connector or wiring to HPFP or injector driver
Faulty HPFP control valve/solenoid or internal pump fault
Interruption during a previous learn/programming attempt

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Engine misfire on the affected cylinder or rough idle
Poor acceleration or reduced power
Hard starting or extended cranking
Possible fuel pressure faults or limp-home mode

What to check

Read and record freeze frame and all stored DTCs with a capable scan tool
Check vehicle service history for recent HPFP or PCM replacement
Verify battery state of charge and charging system health
Inspect HPFP and injector harness connectors for corrosion, bent pins, or looseness
Check fuel rail pressure and compare to specification during cranking and running
Confirm PCM software/calibration level and check for Technical Service Bulletins (TSBs)

Signal parameters

Fuel rail pressure sensor voltage during cranking/running (commonly ~0.5–4.5 V range depending on pressure)
HPFP control solenoid command (PWM duty cycle or on/off command from PCM)
HPFP supply voltage (battery voltage at pump connector)
Injector pulse width and firing events for affected cylinder(s)
PCM diagnostic status bits indicating learned/unlearned state

Diagnostic algorithm

Connect a factory-level scanner or compatible diagnostic tool and retrieve all DTCs and freeze frame data. Note related fuel system or injector codes.
Verify vehicle battery voltage is within specification (fully charged) and that charging system is OK. Recharge or replace battery if low before programming.
Inspect wiring and connectors to the HPFP and affected injectors. Repair any damage, corrosion, or poor connections.
Check fuel rail pressure with a gauge and compare against specification during cranking and under load to rule out mechanical pressure faults.
Confirm whether the HPFP or PCM has been replaced or updated recently. If a new pump is fitted, ensure the correct manufacturer procedure for HPFP learn/programming is followed.
Use the OEM dealer-level diagnostic/programming tool to attempt the HPFP calibration/learn procedure per manufacturer instructions. Follow prompts exactly; ensure stable battery voltage throughout.
If programming fails, capture any tool error messages. Re-check wiring, fuses, and grounds. Attempt re-learn after repairs.
If the pump cannot be calibrated and wiring/PCM are confirmed good, consider replacing the HPFP with a unit that can be programmed and then perform the calibration.
After repair and successful learn, clear codes and test drive to confirm no recurrence. Re-scan to ensure DTC does not return.

Likely causes

HPFP recently replaced and not calibrated with OEM tool
Vehicle battery was discharged or removed while learn procedure in progress
PCM requires software update or reflash
Open/short or poor connection in HPFP control wiring
HPFP internal mechanical failure preventing calibration

Fault status

⚠️ Status

HPFP calibration for one cylinder is missing or not learned. The PCM detected the learned value is invalid or absent and set a fault. Programming with an OEM tool and verifying wiring, battery condition, and PCM software is required.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.5-4.0 hours

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P268B — Calibration of the high-pressure fuel pump not learned / programmed Cylinder