What does it mean?
Ignition E is the fifth ignition control channel, so this code only appears on engines with five or more separate coil outputs. Channels that far along the loom usually take the longest route through the harness, which makes them more exposed to chafe, heat and connector corrosion than the first channels. P035B is stored when the module reads a voltage below its low threshold on this channel while the circuit should be at rest, which is the signature of a short to ground or of an igniter input that has failed shorted. The module then normally disables the channel to protect its output stage, so the coil it drives stops firing.
Symptoms
- Steady misfire on the cylinder served by the fifth channel
- Shaking at idle and vibration felt through the body of the vehicle
- MIL on and flashing during heavy misfire
- Reduced power and hesitation when accelerating
- Fuel smell from the exhaust and increased consumption
- Hard starting, particularly when the engine is cold
Likely causes
- E channel control wire grounded through chafed insulation somewhere along its route
- Internally shorted coil igniter on the fifth channel
- Moisture or corrosion in the coil connector, common on coils sitting in a deep or exposed position
- Harness pinched or trapped under an engine cover or a wiring clip
- Heat damage where the loom passes close to the exhaust manifold
- Shorted module driver, checked only after the external circuit has been proven clear
How to fix it
- Match the misfire counters with the channel assignment before touching any parts
- Disconnect the coil and see whether the low reading persists at the module connector
- Measure resistance from the control wire to ground with both ends disconnected
- Follow the harness along its whole route, giving particular attention to clips and heat exposed sections
- Inspect the coil connector for moisture, oil and corroded terminals
- Swap the coil with a known good one to see whether the fault follows the component
- Repair the short, clear the code and confirm over a road test under load