P1366

Code

LAND ROVER P — Powertrain

Ignition coil activation failure cylinder 6

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 22 EN: 41 RU: 15

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Page language: EN

Causes

Failed ignition coil (coil-on-plug or coil pack) on cylinder 6
Open, short, or high-resistance wiring in the coil primary or ground circuit
Corroded or poorly connected coil connector or terminal
Blown fuse or faulty power supply to ignition coils
Faulty ECM/ignition driver transistor
Damage from oil/water intrusion or heat to coil or connector

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Rough idle or misfire felt at idle
Reduced engine power, hesitation or stumble under load
Decreased fuel economy and increased emissions
Possible visible misfire in scan tool live data (cylinder 6 misfire counter)

What to check

Read and record freeze frame and live data (misfire counters, coil status)
Visual inspection of coil 6, connector and wiring for damage, corrosion or oil
Check coil supply fuse(s) and relay(s) for continuity and operation
Measure coil primary and secondary resistance and compare with factory spec
Backprobe coil connector with key ON/engine cranking to verify supply voltage and switching driver
Swap coil 6 with a known-good coil on another cylinder to see if code follows

Signal parameters

Coil supply voltage (should be battery voltage with key ON; ~12V nominal)
Primary coil resistance (check against OEM spec)
Secondary coil resistance (check against OEM spec)
Primary current pulses / dwell time when cranking or running
ECM driver switching (ground or +12V pulse depending on system)
Cylinder 6 misfire counter and ignition command status from scan tool

Diagnostic algorithm

Connect a capable scan tool. Read all stored codes and freeze-frame data. Note misfire counts for cylinder 6.
Perform a visual inspection of coil 6, connector and wiring. Repair any obvious damage or corrosion.
With ignition OFF, unplug coil 6 and measure primary and secondary resistances. Compare with factory specification.
Swap coil 6 with another cylinder's coil. Clear codes and run the engine. If code moves to the other cylinder, replace the coil.
With connector plugged in, backprobe the coil connector with key ON (engine OFF) to verify constant supply voltage and good ground reference. Crank engine and observe driver switching.
Use an oscilloscope or scope-capable scan tool to observe primary waveform while cranking/running. Look for absent or abnormal pulses.
If no driver pulse at coil but wiring is good, check continuity from coil connector to ECM and inspect ECM power/ground. If wiring is intact and ECM does not command, consider ECM/driver fault.
Repair or replace defective coil, wiring, connector, or fuse/relay as indicated. After repair, clear codes and confirm repair with test drive and scan tool verification.
If ECM replacement is considered, confirm all wiring, grounds and supply voltages are within spec and perform OEM ECM replacement procedures.

Likely causes

Defective coil unit on cylinder 6
Connector corrosion or intermittent connector contact
Open/short in harness between coil and ECM or battery
Loss of coil supply voltage or ground
ECM coil driver failure when all wiring and coil test good

Fault status

⚠️ Status

Ignition coil activation failure — cylinder 6. ECM commanded coil 6 but did not detect the expected coil response or spark event; fault stored.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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P1366 — Ignition coil activation failure cylinder 6