Exhaust Brake Input Circuit Low

Common symptoms

What you'll notice

• Check the wiring and connections for any damage or loose connections.
• Inspect the brake pedal position sensor and ensure it is properly calibrated.
• Verify the brake fluid level and quality, and replace if necessary.
• Test the exhaust brake solenoid for proper functionality and replace if faulty.
• If all else fails, consider replacing the ECM (Engine Control Module) as a last resort.

Common causes

Most likely first

1. Faulty exhaust brake sensor or switch
2. Wiring or connection issue in the exhaust brake circuit
3. Faulty engine control module (ECM)
4. Possible short circuit or open circuit in the exhaust brake circuit
5. Faulty exhaust brake actuator or solenoid valve

How to diagnose & fix

Work through it in order

1. The vehicle may experience a significant loss of power when accelerating.
2. The check engine light may illuminate on the dashboard.
3. The vehicle may emit excess exhaust smoke or have a poor exhaust odor.
4. The engine may idle roughly or have difficulty starting.
5. The vehicle may have decreased fuel efficiency.