What it means
Voltage on the aftertreatment glow plug control line is above the expected window. 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
How it works
On equipped diesels, the module controls an aftertreatment glow plug that helps ignite injected hydrocarbons during DPF regeneration. P269E sets when the relay control line reads higher than its expected range, pointing to a control wire shorted to battery voltage, an open relay coil, or a poor connector contact.
Common causes
Most likely first.
- Control wire shorted to B+
- Open relay coil
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light
- DPF warning light
- More frequent or unsuccessful DPF regeneration
How to diagnose it
- Review freeze-frame data and live control status to determine whether the high reading appeared while the relay was commanded on or off.
- Inspect the relay control wire for contact with a power feed and examine connectors for corrosion, moisture, loose fit, or pushed-back pins.
- Monitor control-line voltage while gently moving the accessible harness to check for an intermittent change.
- Using the wiring diagram, check for a short to battery voltage and test relay-coil continuity with power isolated as specified by the manufacturer.
- If the wire and relay pass, verify the module output and circuit grounds using the manufacturer's diagnostic procedure.
Common fixes
- Secure a loose connector and clean serviceable terminals.
- Repair a control wire shorted to a power feed.
- Replace the relay if its coil is open.
- Repair damaged connector pins or the module circuit if testing identifies the fault there.
Can I keep driving?
Gentle driving is usually possible if the engine runs normally, but avoid repeated short trips and respond to DPF warnings because regeneration may be unavailable. Continued soot accumulation can restrict the filter 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.