P04D7

Exhaust Brake Input Circuit Intermittent/Erratic

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$11–56 (est.)

Symptoms

Unstable operation of the engine braking system
Reduced braking performance
Check Engine Light Illuminates
Errors in engine operation when the system is activated

Causes

Broken or damaged input circuit wires
Poor contact in connectors
Damper position sensor malfunction
Problems with the control unit
Contact corrosion

How to Fix

Check the integrity of the input circuit wiring
Inspect connectors for oxidation and damage
Check the resistance and voltage of the system sensors
Scan the control unit for other errors
Replace damaged components as necessary

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