Exhaust Aftertreatment Power Relay Control Circuit Low

Common symptoms

What you'll notice

• Check the wiring connections for the exhaust aftertreatment power relay and ensure they are secure and free from any damage.
• Inspect the exhaust aftertreatment power relay for any signs of malfunction or failure, and replace if necessary.
• Verify the power supply and ground connections to the exhaust aftertreatment system, ensuring they are properly connected and functioning.
• Clean the exhaust aftertreatment system components, such as sensors and filters, to remove any buildup or blockage that may be causing the power relay control circuit issue.

Common causes

Most likely first

1. Faulty power relay
2. Loose or damaged wiring/connectors in the power relay circuit
3. Defective exhaust aftertreatment power relay control module
4. Short circuit or electrical issue in the power relay control circuit

How to diagnose & fix

Work through it in order

1. Engine warning light illuminates on the dashboard
2. Engine may experience a decrease in power or struggle to start
3. Increased fuel consumption
4. Loss of acceleration or reduced top speed
5. Exhaust emission levels may exceed legal limits