P035C: Ignition E Control Signal Circuit High

What does P035C mean?

Ignition E is one of the control signal lines from the engine module to an ignition module, ignition output stage or group of coils; which cylinders it serves is defined by the manufacturer, not by the code standard. The code concerns the logic-level control signal, not the coil's primary current (that has its own codes, P0351 ff and P2300 ff). P035C means the control line reads high – typically shorted to voltage. No manufacturer using these codes was found – neither GM nor Ford use the Ignition E to H codes; GM reports coil control faults as P0351 ff (open above 30 kΩ) – so the description follows CARB and that analogy. The affected coils fire wrongly or not at all, causing misfire; many modules then shut off injection to those cylinders to protect the catalyst.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Check engine light on
• Misfire, jerking, rough idle
• Loss of power, possibly cylinders shut off
• Additional misfire codes P0300 ff

Common causes

• High Control line shorted to a supply wire
• Medium Ignition module or coil faulty
• Medium Moisture or corrosion in the connector
• Low Driver stage in the engine module

Likelihood is a general estimate across vehicles; your make and model may differ.