P0359

Ignition Coil I Primary/Secondary Circuit Malfunction

P0359 is a generic OBD-II powertrain diagnostic trouble code: Ignition Coil I Primary/Secondary Circuit Malfunction. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P0359
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
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What P0359 means

P0359 indicates a fault in the primary or secondary circuit of ignition coil "I", which fires cylinder 9. The PCM applies a ground to the primary driver circuit for a calibrated dwell period, storing magnetic energy in the coil; releasing the ground causes the field to collapse and induces high voltage (20–40 kV) in the secondary winding to fire the spark plug. The PCM monitors current on the primary feedback line every ignition event — an open circuit (no current ramp) or short (overcurrent) on the driver triggers P0359. Cylinder 9 is present only on V10 and V12 engines. Relevant platforms include the Audi/Lamborghini 5.2L FSI V10 (R8, Gallardo, Huracan), BMW S85 5.0L V10 (E60/E63 M5/M6), Dodge Viper 8.4L V10, BMW N73/N74 V12 (7-Series, Rolls-Royce), Mercedes-Benz M275 V12 (S65, SL65, CL65 AMG), and Aston Martin/Ferrari V12 platforms. P0309 (Cylinder 9 Misfire Detected) nearly always accompanies this code; on platforms where misfires above a catalyst-damage threshold are detected, the PCM activates a flashing MIL and may disable the injector for cylinder 9 as a protective measure.

Common causes

Most-frequently reported root causes when P0359 is logged.

  • 1
    Defective ignition coil "I" — failed primary or secondary winding (most common cause)
  • 2
    Open or shorted PCM driver wire between the ECU and coil "I" connector
  • 3
    Corroded, damaged, or improperly seated connector on coil "I"
  • 4
    Failed or severely worn spark plug on cylinder 9 (especially relevant on high-mileage V10/V12 engines with iridium or platinum plugs at service limit)
  • 5
    Cracked coil boot, tower, or body allowing secondary high-voltage arc to ground
  • 6
    PCM coil driver transistor failure for cylinder 9 (rare)
  • 7
    Wiring harness chafe caused by engine movement, especially on compact V10 installations where harnesses are tightly routed

Symptoms drivers notice

Check engine light illuminated (flashing MIL if active misfire P0309 endangers the catalyst)
Engine misfire on cylinder 9 — particularly pronounced on V10 platforms where each cylinder contributes 10% of total power
Companion code P0309 (Cylinder 9 Misfire Detected) stored alongside P0359
Notable loss of smoothness and power in high-revving V10/V12 engines
Elevated fuel consumption and hydrocarbon emissions
Risk of expensive catalytic converter damage on high-performance V10/V12 vehicles
On some V10 platforms (Audi R8 / Lamborghini), rough idle detectable as a cyclic vibration at approximately 1/10 of idle RPM frequency

How to diagnose P0359

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all stored and pending codes — confirm P0309 and identify any other cylinder-specific, fuel-trim, or sensor codes
  2. 2
    Coil swap test: transfer coil "I" to a known-good cylinder and clear codes — if the fault and P030X misfire follow the coil to the new cylinder, the coil is defective
  3. 3
    Inspect the coil "I" connector closely: V10/V12 engines have many coil connectors in tight spaces; confirm each one is fully seated and undamaged
  4. 4
    Measure primary (0.4–2 Ω) and secondary (6,000–15,000 Ω) resistance with a multimeter to confirm coil health
  5. 5
    Verify battery voltage at the coil B+ supply terminal with ignition ON
  6. 6
    Use an oscilloscope on the PCM driver wire to confirm a clean, consistent switching waveform during engine cranking; missing or irregular switching points to a PCM driver or wiring fault
  7. 7
    Inspect and replace the cylinder 9 spark plug if worn, fouled, or at or beyond its change interval (iridium plugs on V10 engines typically 60,000–100,000 km)
  8. 8
    On Audi R8 / Lamborghini mid-engine V10 layouts, inspect harness routing around the engine-to-body tunnel for chafing on chassis edges during engine movement

Related powertrain codes

Frequently asked questions

Which engines can set P0359?

Only V10 and V12 engines: Audi/Lamborghini 5.2L FSI V10 (R8 V10, Gallardo, Huracan), BMW S85 5.0L V10 (M5 E60, M6 E63), Dodge Viper 8.4L V10, BMW N73/N74 6.0L V12, Mercedes-Benz M275/M285 V12 (S65/SL65/CL65 AMG), Ferrari/Aston Martin V12 applications, and some large-displacement inline engines with 9+ cylinders (rare in automotive applications). It will never appear on V8 or smaller engines.

P0359 appeared on my Audi R8 V10 — is this a common failure?

Yes. The R8 and Gallardo 5.2L FSI V10 are known for coil failures, particularly on high-mileage engines. The mid-engine layout creates significant heat exposure for coils on both banks. It is common practice to replace all 10 coils and all 10 spark plugs as a preventive set when any single coil fails, since the remaining coils are likely at similar wear levels and a second failure shortly after is common.

Will P0359 damage the catalytic converter?

Yes, if driving continues with the fault active and misfire ongoing. A flashing MIL means the misfire rate is already high enough that the PCM's own catalyst protection threshold has been exceeded — stop driving immediately in that case. V10 and V12 vehicles often have expensive catalyst systems; replacement can be several thousand dollars. Repair P0359 as soon as possible after diagnosis.

Can the PCM itself cause P0359?

A PCM low-side driver failure is uncommon but possible. Before condemning the PCM, verify: (1) the coil is not defective (swap test), (2) the wiring has no opens or shorts (measure resistance end-to-end), and (3) the connector is undamaged. If all external components are confirmed good and the PCM still produces no switching signal on the cylinder 9 driver wire during cranking, a PCM replacement or driver-circuit repair is indicated.

Disabling P0359 in software

RaceTune can permanently disable P0359 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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