P04D3

Exhaust Brake Input Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Reduced engine braking efficiency
Check Engine Light Illuminates
Possible problems with idle speed

Causes

Open or short circuit in wiring harness
Exhaust brake malfunction
Problems with the engine control unit (ECU)
Contact corrosion

How to Fix

Check the wiring harness for breaks and short circuits
Check the functionality of the exhaust brake
Check contacts and connectors
If necessary, replace faulty components

Related codes

P04D0 P04D1 P04D2