Cylinder 10 Contribution/Balance Fault
The P0290 code indicates that the engine control module (ECM) has detected a misfire or imbalance in cylinder 10's power contribution relative to the other cylinders. This is typically caused by a lean fuel mixture, weak spark, low compression, or a faulty injector. The ECM monitors crankshaft acceleration to identify cylinders that are not contributing equally, and if cylinder 10's contribution falls below a threshold, this code is set.
01. Most Common Causes
- Faulty fuel injector on cylinder 10
- Weak or no spark from ignition coil or spark plug
- Low compression in cylinder 10 due to worn rings or valves
- Vacuum leak affecting cylinder 10
- Wiring or connector issues to injector or coil
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced power and acceleration
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Perform a cylinder contribution test using a scan tool to confirm cylinder 10 is weak.
Step 3: Swap ignition coil and spark plug from cylinder 10 to another cylinder and retest; if the fault moves, replace the component.
Step 4: Check fuel injector pulse and resistance; if faulty, replace injector.
Step 5: Perform a compression test on cylinder 10; if low, inspect for mechanical issues.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the misfire can damage the catalytic converter and cause further engine damage. Limp to a repair shop if necessary.
How much does it cost to fix?▼
Costs vary: a spark plug and coil replacement can be $150-$300, while a fuel injector replacement may be $200-$400. Diagnostic fees are additional.