What is the reason for the P0021 intake timing control B2 in the old Teana?
3 Answers
It should be an issue with the variable intake system. Related introduction: Oil problem: It is recommended to try changing the oil, as when the oil becomes dirty, the camshaft rotation may not be smooth or timely. Engine problem: Check the timing marks of the engine. See if the connection line of the camshaft position sensor is loose. It is recommended to go to a 4S shop and use a decoder to check the data flow. ECU problem: If there are no issues with the above, it is recommended to replace the ECU. The cavity on the internal combustion engine cylinder block where the piston is placed. It is the track for the piston movement, where the gas burns and expands, and part of the residual heat from combustion can be dissipated through the cylinder wall, keeping the engine at a normal operating temperature. The types of cylinders include integral type and single-cast type. The single-cast type is further divided into dry type and wet type.
Last time I was driving our family's old Teana, the dashboard suddenly showed a P0021 code, indicating an issue with the intake timing control B2, which really worried me. After checking online, I found that B2 refers to a fault in the variable valve timing system on the second set of cylinders. Common causes include dirty or insufficient engine oil leading to hydraulic control failure, a stuck VVT actuator, or incorrect signals from the camshaft position sensor. I immediately checked the oil dipstick—the level was normal but the oil looked a bit dark, so I took it to the repair shop. The mechanic confirmed with a computer diagnosis that it was an actuator failure. After replacing the part, everything returned to normal. A reminder to fellow car owners: don't delay maintenance. Regular oil changes are crucial. Addressing issues early prevents engine damage. After the repair, both power and fuel efficiency improved significantly, making driving much more reassuring.
In my years of experience in auto repair, the P0021 trouble code is commonly seen in older Teanas. It's related to the intake timing control B2 system. B2 refers to the intake VVT system for the second group of cylinders. Common causes include poor oil condition (dirty or low oil level) affecting hydraulic operation, actuator sticking in position, faulty camshaft sensor, or even false alarms from timing chain misalignment. I recommend owners first check the oil dipstick. If the oil appears clean and sufficient but the warning persists, bring the vehicle to our shop for diagnosis. We'll perform pressure tests to identify the root cause. Minor issues can be resolved with cleaning or oil changes, while major faults may require actuator or sensor replacement. After repair, the system will operate smoothly again. Most importantly, don't neglect regular maintenance to prevent recurrence.
