Faulty ignition coil or integrated driver stage on coil E; Damaged, chafed or corroded wiring in the coil E control circuit, including a short to voltage or an open circuit; Poor connection at the coil connector, with bent, loose or corroded terminals; Wiring fault from another circuit shorting to the control wire, for example from heat damage or a previous repair; Poor power or earth supply to the coil, which affects the signal; Fault in the engine control unit output driver.

P035C

Ignition E Control Signal Circuit High.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
3: AreaIgnition system or misfire
5C: FaultThe specific fault in that area

What it means

P035C means the engine control unit has detected that the control signal circuit for ignition coil 'E' is reading higher than expected. The control unit commands the coil (or its integrated driver) to fire and monitors the signal. It found a voltage that stayed high, which points to a short to voltage, an open circuit, or a fault in the coil driver. Which cylinder coil 'E' refers to depends on the engine and its firing order.

Symptoms

Engine management light on
Misfire or rough running on one cylinder
Hesitation or loss of power under load
Hard starting or extended cranking
Poor fuel economy
Flashing warning light during a severe misfire

Possible causes

Faulty ignition coil or integrated driver stage on coil Elikely
Damaged, chafed or corroded wiring in the coil E control circuit, including a short to voltage or an open circuitlikely
Poor connection at the coil connector, with bent, loose or corroded terminalslikely
Wiring fault from another circuit shorting to the control wire, for example from heat damage or a previous repairpossible
Poor power or earth supply to the coil, which affects the signalpossible
Fault in the engine control unit output driverrare

How to diagnose

Read all stored and pending codes and note the freeze frame data (engine load, speed, temperature). Check for related misfire codes, and look up which cylinder coil E serves on this engine.
Inspect the coil E connector and nearby wiring for damage, heat, rubbing, oil contamination, water ingress and corrosion.
Check the connector terminals for tightness and fit, and make sure the connector locks fully.
Check the live data for misfire counts on the affected cylinder. Clear the code and see how quickly it returns.
Swap coil E with a coil from another cylinder, following the workshop manual. Retest and see whether the fault follows the coil or stays with the circuit.
Check the coil power supply and earth with a multimeter, following the wiring diagram for the model.
Check the control wire for continuity, and for shorts to voltage or earth, with the control unit and coil disconnected. Use the wiring diagram.
Only after all wiring and the coil have been proven good, check the control unit output as the manufacturer's procedure describes.

How to fix

Replace the ignition coil if it fails the swap test or has an internal fault.
Repair or replace damaged wiring in the control circuit, using proper soldered or crimped repairs with sealing.
Clean, repair or replace the connector and terminals if they are corroded or loose.
Restore the correct power and earth supply to the coil if you find a fault.
Replace or repair the control unit only after all other causes are ruled out, then do any required programming.

Can I keep driving?

Medium severity

Short, gentle journeys are possible, but get it checked soon. A continuing misfire can overheat and damage the catalytic converter, so stop driving if the warning light flashes or the engine runs badly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.