P04D6
Exhaust Brake Input Circuit High
P04D6 is an OBD-II diagnostic trouble code meaning: Exhaust Brake Input Circuit High. Common causes: short circuit to power in the switch signal circuit, stuck engine brake switch. Estimated repair cost: $22–100.
Symptoms
- Check Engine Light Is On
- The engine brake may engage involuntarily or may not work
- Reduced braking performance on descents
- Possible jerking when driving in engine braking mode
Causes
- Short circuit to power in the switch signal circuit
- Stuck engine brake switch
- Damage to wire insulation
- Moisture getting into the connector
- ECU malfunction
How to Fix
- Read error codes and capture freeze frame data
- Find the engine brake switch according to the diagram
- Check the voltage in the signal circuit with the switch off
- Disconnect the switch connector and check for voltage on the wire (if present, short to power)
- Check the resistance of the switch and the serviceability of its contacts
- Repair short circuit or replace damaged wire
- Replace the switch if necessary
- Reset the error and check the system operation
Related codes
Error P04D6 by Vehicle Brand
FAQ
What does the P04D6 code mean?
P04D6 is an OBD-II diagnostic trouble code that indicates: Exhaust Brake Input Circuit High
What causes a P04D6 error code?
The most common causes of P04D6 include: Short circuit to power in the switch signal circuit; Stuck engine brake switch; Damage to wire insulation; Moisture getting into the connector.
How do I fix a P04D6 diagnostic trouble code?
To fix P04D6: Read error codes and capture freeze frame data. Find the engine brake switch according to the diagram. Check the voltage in the signal circuit with the switch off. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P04D6?
Yes, but get it checked soon
How much does it cost to fix P04D6?
The estimated repair cost for P04D6 is $22–100. Actual cost depends on your vehicle, location, and labor rates.
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