Low compression and codes P0011, P0641, P0080 and P0455

Good afternoon,

What was the reason they told you this?

The 11 is for VVT. This happens when there is sludge in the oil system and the engine does not run well. The oil can be acid flushed to get out all the sludge for this issue.

The 455 is an evap code that has nothing to do with the engine at all. It could be a purge valve or vent valve in the evap system.

The other 2 codes do not come up. Can you verify those for me?

Roy

11

GENERAL DESCRIPTION
The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the exhaust camshaft. There is no variation in valve timing of the exhaust cam because the exhaust camshaft is driven by the timing belt. The timing of the intake cam is varied by the relative operation the CVVT vane to the housing. The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV (Oil Control Valve). As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease by changing the valve open/close timing of the intake camshaft.

DTC DESCRIPTION
The deviation of the camshaft position from the target point is evaluated during stable driving condition. The ECM accumulates this deviation for a certain period and sets DTC P0011 when the accumulated deviation is too high. The target camshaft position is predetermined value depending on engine speed and throttle angle in the ECM.

455

DTC P0455 EVAP. EMISSION SYSTEM-LEAK DETECTED (LARGE LEAK)

GENERAL DESCRIPTION
Due to the increasing ambient temperature of the fuel and the return of unused hot fuel from the engine. Fuel vapors are generated in the tank. In order to control the release of these vapors to the atmosphere, the evaporative emissions control system is used. The evaporative emission control system reduces hydrocarbon (HC) emissions by trapping fuel tank vapors until they can be burned in the combustion process. Evaporating fuel is stored in a charcoal canister until it can be flushed into the intake manifold. The evaporative emission control system is made up of a fuel tank that can be completely sealed from outside air, a Fuel Tank Pressure Sensor (FTPS). A Canister Close Valve (CCV) that seals the canister from the outside air, a canister filled with activated charcoal granules, a Purge Control Solenoid Valve (PCSV). The evaporative emission system can be checked for leaks by sealing the system off from the outside air, creating a vacuum, and monitoring if the system can hold that vacuum sufficiently for a set amount of time. If it cannot, a leak exists somewhere in the system.

DTC DESCRIPTION
The ECM closes the Canister Close Valve (CCV) at the charcoal canister to seal off the evaporative emission system and then opens purge control valve (PCSV) to generate a vacuum in the fuel tank. This vacuum generation phase will determine if there is a large leak like tank cap open or canister shut off valve (CCV) stuck open. The ECM sets DTC P0455 if the pressure in the fuel tank does not drop as low as predetermined threshold during predetermined maximum vacuum generation period. If the same error code is set in the next driving cycle, the ECM illuminates the MIL.

P0011 - Camshaft position timing over advanced
P0080 - Exhaust valve control solenoid
P0641 - 5 volt reference incorrect

Based on these codes, they could be correct. However, we would need to get the additional info that they may be going on. You mentioned compression readings. Did they give you the actual numbers that they found for each cylinder Then what is the reason they found for the low compression?

Here is a guide that explains what compression is and why it is needed:

https://www.2carpros.com/articles/what-is-engine-compression