What it means
Ignition E control signal stuck low — short to ground. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The ignition E control signal circuit carries the PCM's command to the ignition coil group identified as E. P035B means the signal is being held below its expected level, commonly because the control wire is shorted to ground, so the affected coil group may not fire correctly.
Common causes
Most likely first.
- Short to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
Symptoms
- Check engine light on or flashing
- Engine misfire or rough running
- Power loss or hesitation
- Hard starting
How to diagnose it
- Save freeze-frame data and check live misfire counts with a scan tool to identify cylinders affected while the ignition E signal is low.
- Inspect the ignition E harness and connectors for chafing through insulation, water or corrosion, loose pins, and signs of contact with ground.
- With the wiring diagram, test the ignition E control wire for a short to ground and check connector condition against the manufacturer's procedure.
- Wiggle the harness carefully while monitoring the signal or code status to help locate an intermittent short, if the fault is present during testing.
- If the harness and connectors are sound, test the PCM ignition E output and driver circuit using the manufacturer's diagnostic procedure.
Common fixes
- Repair chafed insulation where the ignition E control wire contacts ground.
- Clean or repair corroded or loose ignition E connector terminals and restore connector sealing.
- Replace damaged sections of the ignition E control harness.
- Repair or replace the PCM only if testing confirms its ignition E driver is holding the signal low.
Can I keep driving?
Avoid driving if the affected cylinders are misfiring badly or the check-engine light flashes, because unburned fuel can damage the catalytic converter. If the engine runs smoothly with a steady light, limit use and have the grounded ignition E signal diagnosed soon.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.