P039B
Cylinder 1 Pressure Too High
P039B is an OBD-II diagnostic trouble code meaning: Cylinder 1 Pressure Too High. Common causes: fuel injector malfunction (fuel overflow), problems with the ignition system (plugs, coils). Estimated repair cost: $56–222.
Symptoms
- Floating idle speed
- Power Loss
- Detonation (engine knocking)
- Increased fuel consumption
- Misfires
Causes
- Fuel injector malfunction (fuel overflow)
- Problems with the ignition system (plugs, coils)
- Mechanical damage to the cylinder (wear of piston rings, valves)
- Incorrect operation of the VVT system
- Cylinder pressure sensor dirty or faulty
How to Fix
- Check the condition of the fuel injectors, replace if necessary
- Diagnose the ignition system (spark plugs, coils)
- Check compression in cylinders
- Scan the VVT system for errors
- Clean or replace cylinder pressure sensor
Related codes
Error P039B by Vehicle Brand
FAQ
What does the P039B code mean?
P039B is an OBD-II diagnostic trouble code that indicates: Cylinder 1 Pressure Too High
What causes a P039B error code?
The most common causes of P039B include: Fuel injector malfunction (fuel overflow); Problems with the ignition system (plugs, coils); Mechanical damage to the cylinder (wear of piston rings, valves); Incorrect operation of the VVT system.
How do I fix a P039B diagnostic trouble code?
To fix P039B: Check the condition of the fuel injectors, replace if necessary. Diagnose the ignition system (spark plugs, coils). Check compression in cylinders. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P039B?
Limited driving only, diagnose soon
How much does it cost to fix P039B?
The estimated repair cost for P039B is $56–222. Actual cost depends on your vehicle, location, and labor rates.
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