P0290 is an OBD-II diagnostic trouble code indicating that the Powertrain Control Module (PCM) has detected cylinder 10 is not contributing its expected share of engine power during the cylinder contribution/balance test. This typically indicates a problem with ignition, fuel delivery, or compression on that specific cylinder.
The most common cause is a failed spark plug, ignition coil, or ignition wire on cylinder 10 preventing proper combustion.
A stuck or failing fuel injector on cylinder 10 may not deliver proper fuel quantity for combustion.
Compression loss due to worn piston rings, bad valve seals, or head gasket failure on cylinder 10 can cause contribution imbalance.
An intake manifold vacuum leak near cylinder 10 can cause an overly lean air-fuel mixture.
A stretched timing chain or belt can cause valve timing to be off on some engines, affecting cylinder 10 specifically.
A control module fault is extremely uncommon for this code and should only be considered after all other causes are ruled out.
The vehicle can typically be driven short distances, but the misfire may cause catalytic converter damage if driven extensively. Have it diagnosed as soon as reasonably possible.
Almost never. The PCM is rarely the cause of P0290. Replacing the computer is almost never the correct fix and is often an unnecessary expense when the actual issue is with the cylinder's ignition, fuel, or compression system.
No. While some technicians recommend replacing all if one fails to prevent future issues, you should diagnose and address only cylinder 10 first, then monitor.
An O2 sensor fault would typically set a different code related to fuel trims or exhaust emissions, not cylinder contribution. Focus on cylinder 10-specific components first.