P1367

Code

MINI P — Powertrain

Ignition coil B, primary/secondary circuit - low

Brand: MINI

Type: P — Powertrain

Views: UK: 0 EN: 3 RU: 0

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Failed ignition coil B (open, shorted, or internal insulation breakdown)
Damaged or corroded coil connector or wiring (short to ground, high resistance, or open)
Faulty spark plug or bad plug-to-coil connection (boot damage, fouling)
Poor battery/charging system voltage or poor ground at coil/engine
Faulty powertrain control module (ECM/PCM) ignition driver
Oil/water intrusion into coil/boot or mechanical damage

Malfunction Indicator Lamp (MIL) illuminated
Engine misfire on the cylinder served by coil B (rough idle, stumble, or hesitation)
Reduced engine power and drivability problems
Increased fuel consumption and possible higher exhaust emissions
Intermittent starting issues in some cases

Read freeze frame and live data for misfire counts, coil B activity, and battery voltage
Visually inspect coil B, connector, wiring harness, and spark plug for damage, corrosion, oil or moisture
Check battery and charging system voltage (engine off and cranking) to rule out low supply
Measure coil primary resistance and secondary resistance against manufacturer specs
Back-probe coil connector to verify supply voltage and driver signal during cranking/engine run
Use an oscilloscope or ignition analyzer to view primary/secondary waveforms for anomalies

Primary resistance (approximate typical range): ~0.2–2.0 ohms (varies by coil design) — consult factory spec
Secondary resistance (approximate typical range): ~5 kΩ–18 kΩ (varies by coil) — consult factory spec
Coil supply voltage: battery voltage (~11–14 V) at rest/run; low supply indicates charging or wiring problem
Primary driver pulse/dwell: measurable pulse when cranking/running — verify with scope
Secondary output: high-voltage pulse present on firing — viewed as characteristic waveform on scope
Note: exact resistance and waveform values are manufacturer-specific; use factory data where available

Retrieve DTCs and freeze-frame data. Note related misfire codes (P03xx) and conditions when code set.
Visually inspect coil B, connector and adjacent wiring for damage, oil/water ingress, corrosion or loose pins.
Check battery and charging voltage. Repair low-voltage/ground issues before further testing.
Measure coil B primary and secondary resistances and compare to factory specifications.
Back-probe coil B connector: verify battery feed present and that driver pulls circuit when cranking/engine running.
Use an oscilloscope or inductive pickup to examine primary and secondary waveforms for weak or absent pulses.
Swap coil B with a known-good coil from another cylinder (if serviceable) and re-scan for the code to isolate coil vs wiring/ECM.
If swapping indicates wiring/ECM: perform continuity/resistance checks from coil connector to ECM and check for shorts to ground/power.
Repair/replace defective coil, wiring, connector, or spark plug as indicated by tests. Clear codes and confirm repair by road test and re-scan.
If wiring and coil test good and problem persists, consider ECM driver fault and follow manufacturer procedures for module diagnosis/repair.

⚠️ Status

Stored when the powertrain control module detects lower-than-expected voltage or signal in the primary or secondary circuit of ignition coil B.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours

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P1367 — Ignition coil B, primary/secondary circuit - low