Exhaust Brake Input Circuit Intermittent/Erratic

Common symptoms

What you'll notice

• Check and tighten all connections in the exhaust brake input circuit.
• Inspect the exhaust brake sensor for any damage or corrosion and replace if necessary.
• Scan the vehicle's computer system for any error codes related to the exhaust brake input circuit and repair as needed.
• Inspect the wiring harness for any frayed or damaged wires and repair or replace as necessary.
• Consult the vehicle's service manual or contact the manufacturer for further troubleshooting and diagnostic steps if the issue persists.

Common causes

Most likely first

1. Loose or faulty exhaust brake wiring connections
2. Malfunctioning exhaust brake switch or sensor
3. Electrical or wiring issues in the exhaust brake system
4. Faulty exhaust brake solenoid or valve
5. Clogged or restricted exhaust brake components

How to diagnose & fix

Work through it in order

1. Check engine light illuminated
2. Loss of power or acceleration
3. Rough or unstable engine idle
4. Stalling or hesitation during acceleration
5. Poor fuel efficiency