Code
P1368
LAND ROVER
P — Powertrain
Ignition system failure group 2
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UK: 16
EN: 28
RU: 21
AI status
Completed
Completed
100%
Causes
- Failed ignition coil pack or individual coil(s)
- Faulty coil driver circuitry in ECM/PCM
- Damaged or corroded wiring or connectors to coils
- Worn or fouled spark plugs
- Low battery voltage or poor charging system output
- Faulty crankshaft or camshaft position sensor(s) or timing issues
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or vibration
- Engine misfire(s) and reduced power
- Poor acceleration and reduced fuel economy
- Hard starting or stalling in some cases
- Possible increased exhaust emissions or catalytic converter concerns
What to check
- Read freeze-frame and all stored/related codes (P03xx, P03xx, P035x, P0335, P0340, etc.)
- Check battery voltage and charging system under load
- Visual inspection of ignition coils, spark plugs, wiring and connectors for damage/corrosion
- Monitor live data: misfire counters, per-cylinder contribution, RPM, injector pulses
- Scan for intermittent communication errors and ECM internal faults
- Inspect crankshaft and camshaft sensor signals and timing correlation
Signal parameters
- Battery voltage (static & cranking)
- Engine RPM
- Per-cylinder misfire counters / PIDs
- Ignition coil primary voltage and current (primary waveform)
- Ignition coil secondary waveform (spark energy, duration)
- Ignition dwell time / coil drive duty
Diagnostic algorithm
- Retrieve all stored codes and freeze-frame data. Note conditions when the code set (RPM, load, temperature, voltage).
- Perform a visual inspection of coils, spark plugs, wiring harness, connectors and ground points for damage, loose pins or corrosion on group 2 circuits.
- Check battery state-of-charge and charging output. Ensure system voltage is within specification during cranking and at idle/load.
- Monitor live data for misfire counts and per-cylinder contribution. Identify which physical cylinders comprise 'group 2' on this application via vehicle-specific documentation.
- Swap ignition coils between a known-good cylinder and a suspect cylinder in group 2 (if coils are individual). Clear codes and re-run to see if fault follows the coil.
- Use an oscilloscope to capture primary and secondary coil waveforms on a suspect cylinder while replicating the condition. Compare waveforms to known-good patterns.
- Measure coil resistances (primary and secondary) per service specifications; bench-test coil packs/modules if applicable.
- Inspect and backprobe coil harness power and driver signals at the connector. Check for intermittent opens/shorts, high resistance, or poor ground.
- Verify crankshaft and camshaft sensor signals and timing correlation. Check for timing chain/belt issues or sensor alignment that could be causing misfires.
- If wiring and components check out, consider ECM coil driver fault or software. Check for TSBs or software updates; consult manufacturer diagnostic flow for ECM testing.
- After repair or component replacement, clear codes, perform a controlled road test to confirm the issue is resolved, and re-check for pending/confirmed codes.
Likely causes
- Damaged ignition coil(s) serving group 2 cylinders
- Intermittent or open/short in coil harness or connector
- Weak battery or poor battery/charging system voltage under load
- Faulty spark plugs in group 2 cylinders
- ECM coil driver failure or internal fault
- Crankshaft/camshaft position signal timing or sensor fault
Fault status
Status
Ignition system failure — group 2 detected by ECM. Indicates irregular spark/coil driver performance affecting the second group of cylinders; requires electrical and ignition system diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.5 hours
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