What it means
The supply voltage on injector group E is above the upper limit. Overvoltage on the group-E supply can mis-time or damage the injectors. Causes: charging-system overvoltage, a stuck supply relay or regulator, or a wiring fault shorting the group-E supply to a higher voltage.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Injector group E receives power through a shared supply-voltage circuit. The control module sets this code when that feed rises above its upper limit, which can disrupt injector operation and may expose the injectors or related electronics to damaging voltage.
Common causes
Most likely first.
- Charging system overvoltage
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
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 compare the recorded group E supply reading with live data to determine whether the high voltage is ongoing or occurred under a particular condition.
- Inspect the group E feed harness and connectors for a pinched wire or short to a higher-voltage source, as well as loose or corroded connections.
- Check charging-system operation and related system-voltage codes, because charging overvoltage can raise the injector supply.
- Test the group E supply circuit and its relay or regulator, if fitted, for a short or stuck switching condition using the manufacturer's procedure.
- If charging voltage and wiring are within specification, inspect control module connections and follow the manufacturer's circuit diagnosis before replacing an injector or module.
Common fixes
- Repair a pinched group E supply wire that is contacting a higher-voltage source.
- Repair loose, corroded, or damaged connections in the group E feed.
- Correct a charging-system overvoltage or replace a faulty supply relay or regulator, as diagnosed.
- Repair a module connection only after confirming the charging system and harness are within specification.
Can I keep driving?
Have the high-voltage fault checked promptly and avoid long trips or heavy engine load, especially if the engine is misfiring. Continued overvoltage can damage injector electronics and worsen drivability.
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.