P3421
Cylinder 3 Exhaust Valve Control Circuit/Open
P3421 is an OBD-II diagnostic trouble code meaning: Cylinder 3 Exhaust Valve Control Circuit/Open. Common causes: broken wiring to the valve of the 3rd cylinder, solenoid valve malfunction. Estimated repair cost: $17–89.
Symptoms
- Unstable engine operation
- Power Loss
- Increased fuel consumption
- Check Engine Light Is On
- Possible misfire in cylinder 3
Causes
- Broken wiring to the valve of the 3rd cylinder
- Solenoid valve malfunction
- Problems with the engine control unit
- Short circuit in the circuit
- Mechanical failure of the valve mechanism
How to Fix
- Check the integrity of the wiring to the valve
- Test solenoid valve resistance
- Check connector contacts
- Diagnose the engine control unit
- If necessary, replace the faulty valve
Related codes
Error P3421 by Vehicle Brand
FAQ
What does the P3421 code mean?
P3421 is an OBD-II diagnostic trouble code that indicates: Cylinder 3 Exhaust Valve Control Circuit/Open
What causes a P3421 error code?
The most common causes of P3421 include: Broken wiring to the valve of the 3rd cylinder; Solenoid valve malfunction; Problems with the engine control unit; Short circuit in the circuit.
How do I fix a P3421 diagnostic trouble code?
To fix P3421: Check the integrity of the wiring to the valve. Test solenoid valve resistance. Check connector contacts. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P3421?
Limited driving only, diagnose soon
How much does it cost to fix P3421?
The estimated repair cost for P3421 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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