What it means
The supply rail to injector group E is open, so none of the injectors in this group can fire. The affected cylinders produce no power and the engine runs rough or on reduced cylinders. Causes: a broken supply wire, an open relay or fuse, or a disconnected group-E supply connector.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Injector group E is a set of fuel injectors sharing a supply-voltage feed; without that feed, the group may not be able to inject fuel. The control module detects an open in the group E supply circuit, which can leave the cylinders served by that group misfiring or without power.
Common causes
Most likely first.
- Open supply wire or blown fuse
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
How to diagnose it
- Save freeze-frame data and read cylinder-specific misfire data to identify which cylinders are affected and whether they correspond to injector group E.
- With the ignition off, inspect the group E injector supply connector and harness for disconnection, damaged wiring, corrosion, or pushed-back pins.
- Check the applicable fuse and supply relay, if fitted, for an open or poor connection, using the vehicle's wiring information to identify the group E feed.
- With the circuit energized only as directed by the manufacturer's procedure, check for supply voltage at the group E feed and trace the open toward the relay, fuse, or connector.
- If the feed wiring and protection devices are intact, test continuity through the group E supply path and check module connections before suspecting an internal fault.
Common fixes
- Reconnect the group E supply connector or repair a loose terminal.
- Replace a failed fuse after checking for the cause, or repair a faulty supply relay.
- Repair the open wire in the injector group E supply harness.
- Repair an internal module connection only after the supply circuit has been verified.
Can I keep driving?
Avoid driving with a persistent rough-running or misfiring engine; arrange a short, gentle trip for repair only if it runs steadily enough to do so. Unburned fuel can overheat and damage the catalytic converter, and loss of power can make driving unsafe.
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.