Exhaust Aftertreatment Power Relay Control Circuit High

Common symptoms

What you'll notice

• Check the wiring connections to the exhaust aftertreatment power relay and ensure they are secure and free of any damage.
• Inspect the exhaust aftertreatment power relay for any signs of malfunction or damage and replace it if necessary.
• Test the exhaust aftertreatment power relay control circuit for any voltage irregularities and repair or replace any faulty components.

Common causes

Most likely first

1. Faulty exhaust aftertreatment power relay
2. Malfunctioning control circuit for the exhaust aftertreatment power relay
3. Short circuit or open circuit in the exhaust aftertreatment power relay control circuit
4. Incorrect voltage supply to the exhaust aftertreatment power relay

How to diagnose & fix

Work through it in order

1. Check engine light illumination
2. Decreased engine performance or power
3. Increased fuel consumption
4. Difficulty starting the vehicle
5. Strange exhaust odor or excessive smoke from the exhaust