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Home / DTC / P268A — Fuel injector calibration not learned / programmed

P268A — Fuel injector calibration not learned / programmed

Detailed page for trouble code P268A.

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Code

P268A

LAND ROVER P — Powertrain

Fuel injector calibration not learned / programmed

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • New or replacement fuel injector(s) installed but injector calibration/ID not programmed
  • ECM reflash, replacement, or loss of learned injector data
  • Aftermarket or non‑matched injectors without proper ID/calibration
  • Poor battery voltage during injector learn or programming attempt
  • Faulty wiring or poor connector contacts between injectors and ECM
  • Defective injector(s) producing invalid ID or communication to ECM

Symptoms

  • Malfunction Indicator Lamp (MIL) or check engine light illuminated
  • Possible rough idle, misfire, or poor running if injector calibration mismatch is significant
  • Reduced performance or drivability complaints in some conditions
  • History of recent injector replacement, fuel rail service, or ECM programming

What to check

  • Read freeze frame and full DTC list with a capable diagnostic scanner (preferably JLR‑compatible)
  • Check for related codes (injector circuits, ECM memory, CAN bus)
  • Verify vehicle service history for recent injector or ECM replacement or software update
  • Verify battery state of charge and charging system—ensure stable >12.4 V during tests
  • Visually inspect injector connectors, wiring harness, and fuel rail for damage or corrosion
  • Use a scan tool to view injector learn/ID status, and any manufacturer‑specific injector data/flags

Signal parameters

  • Injector pulse width (ms)
  • Injector ID / calibration flag (manufacturer-specific scan data)
  • Battery voltage (V) during programming/learn events
  • Rail/fuel pressure (kPa or bar) — ensures proper conditions during learning
  • RPM and crank reference signal — some learn procedures require engine cranking or running
  • ECM software / part number and calibration identifier

Diagnostic algorithm

  1. Confirm and record DTC P268A and any related codes and freeze frame data with a diagnostic scanner capable of displaying Land Rover/JLR-specific data.
  2. Check vehicle history for recent injector, fuel rail, or ECM replacements or software updates. Ask technician/shop if an injector learn was performed after service.
  3. Verify battery state: fully charge battery and confirm charging system good. Low or unstable voltage can prevent successful learning.
  4. Clear codes, then attempt the manufacturer-specified injector learn/programming procedure using the proper JLR diagnostic tool (e.g., SDD/Pathfinder or current JLR diagnostic). Follow the exact steps and prerequisites described by the manufacturer.
  5. If programming fails, capture any manufacturer tool error messages. Re-attempt learn with battery maintained (battery conditioner/charger) and ensure engine conditions match procedure (cold/hot, key on/off, running/cranking as required).
  6. If learn still fails, inspect wiring and connectors for the affected injector(s): backprobe connector, check for continuity to ECM, check for short to ground or open, and verify correct injector drive voltages/signals with oscilloscope or scope-enabled scan tool.
  7. Measure injector resistances and compare to spec. If out of range, replace suspect injectors with correct OEM parts and perform learn again.
  8. If injectors and wiring check good but learn cannot be completed, verify ECM software level and reflash or update ECU per technical service information, then retry injector learning.
  9. If persistent after all checks and procedures, consider replacing ECM only after confirming with manufacturer guidance and ensuring injector hardware and harness are known good. Document all steps and codes.
  10. After successful learn, clear codes and perform road test. Re-scan to confirm no return of P268A or related injector/ECM codes.

Likely causes

  • Injector learn procedure not performed after injector or ECM replacement
  • Battery low/unstable during previous programming attempt
  • Aftermarket or reman injectors lacking factory calibration IDs
  • Blown fuse, poor connector, or wiring causing injector data not seen by ECM

Fault status

⚠️ Status
P268A - Fuel injector calibration not learned / programmed. ECM reports injector ID/learn data missing or not programmed; injector learn required.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0 - 3.0 hours

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413

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