What does it mean?
The seventh ignition control channel has to be pulled low by the module in order to trigger its coil. P036C is set when the module commands the channel but keeps measuring a high voltage on it, so the current it expects never flows. That points to an open or high resistance path in the control circuit, or to battery voltage arriving on the line from another circuit. On this channel the long harness run to the rear of the engine makes corroded terminals and high resistance joints a frequent cause, so voltage drop testing matters more here than a simple continuity check.
Symptoms
- Persistent misfire, rough idle and vibration through the vehicle
- MIL on and flashing when the engine is loaded
- Reduced power and hesitation when accelerating
- Hard starting, worse in cold or damp conditions
- Exhaust popping and a raw fuel smell
- Higher fuel consumption
Likely causes
- High resistance joint or a partial break in the long G channel control wire
- Corroded, loose or spread terminals in the coil or module connector
- Control line shorted to battery voltage through damaged insulation
- Open igniter input inside the seventh coil
- Poor ignition ground so the driver cannot pull the line down
- Faulty module output stage, evaluated only after the wiring has been proven good
How to fix it
- Read the misfire counters and freeze frame data to identify the cylinder and the conditions
- Inspect and probe the connector terminals at both ends for tension, corrosion and moisture
- Measure the control line voltage with the ignition on and while cranking to confirm it never falls
- Carry out a voltage drop test along the whole control wire rather than a simple continuity check, since a long run can hide a resistive joint
- Disconnect the module and test the line for battery voltage arriving from another circuit
- Check the coil supply, the ignition ground and the relevant fuse
- Repair the wiring or renew the coil, then clear the code and verify with a road test under load