This is what the internet says...
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If
all cylinders are showing P035X codes simultaneously (e.g., P0351, P0352, P0353, and P0354 all at once), it is highly unlikely that every single ignition coil failed at the exact same second.
Instead, you are looking at a
system-wide electrical or feedback failure. All your ignition coils share a common power source, a common ground network, and feed back into the same engine computer (PCM/ECU).
The main culprits for this issue include:
Blown or Failing Ignition Fuse or Relay
All ignition coils receive 12V power from a shared circuit. If the ignition fuse is blown or the ignition relay is failing/corroded, power to all coils will drop intermittently or entirely.
- The Fix: Check your vehicle’s fuse box for any blown fuses or bad relays labeled IGN, INJ, or COIL.
Failed Main Engine Ground
Ignition coils require a strong, clean electrical ground to fire correctly and send feedback to the computer. If the main engine ground strap (the thick wire connecting your engine block to the car’s frame/battery) is loose, rusted, or snapped, the electrical circuit for
all coils collapses.
- The Fix: Locate the engine ground straps, clean any corrosion off the metal contact points, and tighten the bolts.
A Main Wiring Harness Short or Corrosion
The wires for all the coils bundle together into a single master harness before routing to the PCM.
- If a single wire within that harness rubs against the engine block and shorts to ground, it can disrupt the voltage signals across the entire circuit.
- Check the master electrical connector where the engine harness plugs into the main vehicle firewall for water intrusion or bent pins.
Damaged PCM / ECM (Rare)
The Powertrain Control Module uses internal electronic switches ("drivers") to ground and fire each coil. While rare, a massive voltage spike (from jump-starting backwards or a severe short circuit) can damage the main ignition control chip inside the PCM, causing it to lose control of all cylinders at once"
