What is the reason for the P0021 intake timing control B2 in the old Teana?
4 Answers
It is likely an issue with the variable intake system. It is recommended to try changing the engine oil, as dirty oil can cause the camshaft to rotate less smoothly or inaccurately. Check the engine timing marks. Also, inspect whether the connection wires of the camshaft position sensor are loose. It is advisable to visit a 4S shop and use a diagnostic scanner to check the data stream. More details are as follows: ECU issue: If everything else is fine, consider replacing the ECU. The cylinder in an internal combustion engine is the cavity where the piston is placed. It serves as the track for piston movement, where the fuel burns and expands. The cylinder wall also helps dissipate some of the residual heat from combustion, maintaining the engine at a normal operating temperature. Types of cylinders: Cylinders can be either integral or individually cast. Individually cast cylinders are further divided into dry and wet types.
Recently, I encountered the P0021 fault light issue while driving my old Teana. After checking, it indicates a problem with the intake camshaft timing control B2, simply put, the timing system of the second group of cylinders is misaligned. There are many possible causes, but it's quite common. A frequent reason is insufficient oil pressure, such as when the old oil hasn't been changed for too long and becomes too thin, or the oil filter is clogged, affecting performance. Another possibility is that the VVT solenoid valve is stuck, causing delayed commands, which leads to misalignment between the timing chain and the camshaft. Additionally, the timing chain itself may be aging or loose, causing unstable engine speed and reduced power. I suggest first checking the oil level and filter, and trying a new oil change—it's cost-effective and simple. If that doesn't work, use a diagnostic scanner to check real-time data and assess the solenoid valve's performance. Address the issue promptly to avoid a broken chain requiring major repairs. Regular maintenance of the oil pressure system can prevent this fault. Older Teanas require careful attention to avoid such problems.
I've repaired quite a few P0021 faults in older Teanas. To put it simply, it's a performance issue with the intake camshaft timing B2. Diagnosis isn't difficult, but you need to act quickly. The main cause is mostly a faulty variable timing control solenoid valve - problems with coil resistance sending erratic signals or unstable oil pressure causing it to fail under high temperatures. Secondly, the timing chain may have stretched due to wear, causing misalignment with the camshaft position. Another possibility is poor contact in the sensor wiring misleading the ECU. During troubleshooting, I recommend using diagnostic equipment to read codes and check specific data streams, measure the solenoid valve's resistance to confirm if replacement is needed - often a simple part swap can fix it. Don't forget to check the engine oil condition, as poor oil quality can exacerbate the problem. Timely repairs can protect the engine from more severe damage like piston-to-cylinder contact.
Hey, the P0021 code on the old Teana is quite interesting. It indicates an issue with the intake camshaft timing control on Bank 2, where B2 refers to the second cylinder group. Common causes might include a dirty solenoid valve clogged with sludge that needs cleaning or replacement, or slight timing chain slippage causing misalignment and affecting valve timing. ECU software bugs are rare but an update might help. I enjoy DIY work—first check oil pressure and the filter, then unplug sensors to inspect contacts if all seems fine. If simple fixes don't work, better visit a professional shop for scanning instead of struggling further.
