Contents
- 1 P0020 Code Definition
- 2 What does the P0020 Code Mean
- 3 P0020 Code Causes
- 4 Symptoms of P0020 Code
- 5 How to Diagnose the P0020 Code
- 6 P0020 Code Diagnostic Mistakes
- 7 What repairs can fix the P0020 Code?
- 8 How to avoid triggering the P0020 Code?
- 9 Repair Costs for P0020 Code
- 10 More About the Camshaft Solenoid, Actuator, and the PCM Detection System
- 11 FAQ Section
The camshaft is an important component of an internal combustion engine that controls the opening and closing of the engine’s valves. The main function of the camshaft is to control the timing and duration of the opening and closing of the intake and exhaust valves. The PCM continuously uses the camshaft data to regulate the fuel injector rate. When your PCM monitors an issue with the bank 2 camshaft position actuator circuit. This article describes the P0020 code causes, symptoms, and how to fix it.
P0020 Code Definition
The P0020 code stands for “Camshaft Position (A) Actuator Circuit (Bank 2).”
Bank 2 typically refers to the side of the engine that contains cylinder 2.
What does the P0020 Code Mean
The P0020 code indicates that the powertrain control module (PCM) has monitored that the bank 2 intake camshaft is not synchronizing with the oil control valve because of an open or short circuit.
The variable valve timing (VVT) system is designed to enhance fuel economy and engine performance by controlling the timing of the opening and closing of the intake and exhaust valves.
The engine can operate more efficiently by precisely regulating valve timing, resulting in improved fuel economy and increased power output. This system adjusts the valve timing according to the engine’s speed and load, allowing for optimal operation under various driving conditions.
The vehicle’s Powertrain Control Module (PCM) monitors the VVT circuit for voltage fluctuations and triggers the P0020 code if the voltage deviates outside the manufacturer’s specified range for a calibrated duration.
P0020 Code Causes
- Bad Oil Control Valve (OCV): The OCV controls the flow of oil to the camshaft actuators, which regulate the valve timing. A faulty OCV can cause the VVT system to malfunction and trigger the P0020 code.
- Wiring issues: Faulty wiring in the VVT circuit can cause voltage fluctuations and trigger the P0020 code.
- Faulty camshaft position sensor: The camshaft position sensor detects the position of the camshaft and sends this information to the engine control module. A failed camshaft position sensor can cause the VVT system to malfunction and trigger the P0020 code.
- Engine oil problems: Dirty or low-quality engine oil can cause the VVT system to malfunction, leading to the P0020 code.
- Failed timing chain or tensioner: A failed timing chain or tensioner can cause the camshaft to lose synchronization with the crankshaft, leading to the P0020 code.
- Failed PCM: In rare cases, a failed powertrain control module (PCM) can cause the VVT system to malfunction and trigger the P0020 code.
Symptoms of P0020 Code
- Decreased fuel efficiency: A faulty VVT system can cause a decrease in fuel efficiency, resulting in more frequent trips to the gas station.
- Check Engine Light Illumination: The most apparent symptom of the P0020 code is the illumination of the Check Engine Light on the dashboard.
- Poor engine performance: The VVT system’s failure can cause a decrease in engine performance, such as reduced power, acceleration, and fuel economy.
- Poor emissions: A malfunctioning VVT system can cause the vehicle’s emissions to exceed acceptable levels, resulting in failed emissions tests.
- Rough idling: A faulty VVT system can lead to engine misfires, resulting in rough idling or unstable engine RPM.
- Stalling: If the VVT system fails to regulate the valve timing correctly, the engine may stall or have difficulty starting.
Read More: P0019 Code Symptoms and Causes
How to Diagnose the P0020 Code
To diagnose the P0020 code, a mechanic typically follows the below-given steps:
- Visual inspection: The technician will first perform a visual inspection of the engine, looking for signs of damaged wires, loose connections, or other visible issues.
- Scan for codes: Using an OBD-II scanner, the technician will retrieve the P0020 code and any related codes to help identify the root cause of the problem.
- Inspect the camshaft position sensor: The technician may check the camshaft position sensor’s wiring and connections for any faults or issues. If necessary, the sensor may need to be replaced.
- Test the OCV: Using a multimeter, the technician will test the Oil Control Valve’s resistance and check for proper operation. If the OCV is faulty, it may need to be replaced.
- Inspect the wiring: The technician will check the wiring harness for signs of damage, corrosion, or loose connections. Any issues found may require repairing or replacing the affected wiring.
- Check the oil quality: The technician will check the engine oil level and quality, as low or dirty oil can cause VVT system malfunctions.
- Check the timing chain: The technician may inspect the timing chain and tensioner for any damage or wear that could cause the camshaft to lose synchronization with the crankshaft.
- Test the PCM: If all other potential causes have been eliminated, the technician may need to test the functionality of the PCM.
P0020 Code Diagnostic Mistakes
- Not checking the engine oil: Low or dirty engine oil may cause the VVT system to deteriorate. You should check the engine oil level and quality before proceeding with diagnosis.
- Overlooking the timing chain and tensioner: The timing chain and tensioner can also cause the P0020 code if they’re worn or damaged. You should inspect these components for any signs of wear or damage.
- Assuming the OCV is the problem: While a faulty OCV can cause the P0020 code, it’s not always the root cause. You should perform a complete diagnosis before replacing any parts.
- Overlooking loose connections: Loose connections in the wiring harness may cause the VVT system to go bad. You should thoroughly inspect the wiring harness for any signs of loose connections.
- Ignoring other related codes: The P0020 code Toyota may be accompanied by other related codes. You should check for any additional codes and address them as needed.
- Failing to check the camshaft position sensor: A faulty camshaft position sensor can also cause the engine code P0020. You should test the sensor and its connections for any faults.
What repairs can fix the P0020 Code?
- Flushing and changing the engine oil: If the engine oil is dirty or of poor quality, it may need to be flushed and changed.
- Replacing the Oil Control Valve (OCV): If the OCV is malfunctioning, it may need to be replaced.
- Replacing the camshaft position sensor: If the camshaft position sensor is faulty, it may need to be replaced.
- Repairing or replacing damaged wiring: If the wiring harness is damaged or has loose connections, it may need to be repaired or replaced.
- Replacing the timing chain or tensioner: If the timing chain or tensioner is worn or damaged, it may need to be replaced.
- Replacing the engine control module (PCM): In rare cases, a failed PCM may need to be replaced.
How to avoid triggering the P0020 Code?
The P0020 code indicates a problem with the camshaft position sensor circuit, specifically for Bank 2. Here are a few steps you can take to avoid triggering this code:
- Regular maintenance: Regular maintenance, such as oil changes and tune-ups, can help prevent engine problems that could trigger the P0020 code.
- Keep the engine clean: A clean engine is less likely to develop problems. Regularly clean the engine bay and surrounding areas to prevent dirt and debris from causing issues.
- Use high-quality components: When replacing components, such as the camshaft position sensor, use high-quality parts from reputable manufacturers to ensure their reliability.
- Check wiring and connections: Inspect the wiring and connections for the camshaft position sensor regularly for any signs of damage or corrosion. Make sure they are secure and properly connected.
- Address any related codes: If you notice any related codes, such as misfire codes, address them promptly to prevent further engine damage and the P0020 code from being triggered.
Repair Costs for P0020 Code
To fix the P0020 code, you need to repair one or more below given parts:
| Parts | Cost |
| Timing Chain | $1,620 to $1,880 |
| VVT Control Solenoid replacement | $400 to $620 |
| Oil filter and oil change cost | $15 to $70 |
| Wiring repair/replacement | $90 to $1100 |
| Crankshaft Position Sensor replacement | $160 to $250 |
| Timing Belt | $320 to $450 |
More About the Camshaft Solenoid, Actuator, and the PCM Detection System
The camshaft actuator sends a signal to the solenoid in the form of a rapid on-off pulse to control the opening and closing of the intake and exhaust valves. A solenoid is a two-wire unit that receives voltage either from a relay or a direct connection to the ground. If the voltage is relay-supplied, the solenoid is grounded by the PCM output, while if it is directly connected to the ground, the PCM provides voltage in the form of a duty cycle.
When the solenoid receives voltage and is grounded by the PCM, the PCM expects to receive voltage from the solenoid winding to the driver. When the PCM grounds the solenoid, it pulls the voltage to the ground, allowing the solenoid to operate. In the case of a hard-wired solenoid, voltage is cycled to the solenoid to open oil passages to the cam phaser and reach the desired camshaft angle target.
In a voltage-supplied solenoid with a grounded PCM cycle, if the PCM isn’t energizing the solenoid and the voltage isn’t coming through the solenoid, it means the circuit is compromised. This can be caused by an open solenoid, wiring, or shorted ground on the solenoid. In this scenario, camshaft position codes are likely to be stored, and drivability issues can occur due to the solenoid being constantly activated.
If the PCM energizes the solenoid and the voltage remains, it indicates that the internal driver or transistor for the solenoid has failed.
FAQ Section
The P0020 code Toyota triggers when the bank 2 intake camshaft does not synchronize with the oil control valve because of an open or short circuit.
The severity of the P0020 code depends on the underlying cause of the problem. In some cases, the code may indicate a minor issue, while in other cases, it may indicate a significant problem that requires immediate attention. In general, the P0020 code can affect the vehicle’s performance, fuel efficiency, and emissions. If left unaddressed, it can lead to more severe engine damage, such as increased wear on the camshaft and timing chain. This can result in expensive repairs, including engine replacement.
- Flushing and changing the engine oil
- Replacing the oil control valve
- Replacing the camshaft position sensor
- Repairing or replacing damaged wiring
- Replacing the timing chain or tensioner
- Replacing the engine control module
The camshaft position actuator circuit controls the timing of the camshaft in an engine. If the camshaft position actuator circuit is open, it means that there is a break or discontinuity in the electrical circuit that connects the actuator and the oil control valve. This can be caused by a damaged or disconnected wire, a faulty oil control valve or actuator, or a blown fuse.
When the circuit is open, the actuator and the oil control valve will not be able to communicate, and the engine’s timing will be affected. This can cause various issues, including poor engine performance, reduced fuel efficiency, and increased emissions. If left unrepaired, an open camshaft position actuator circuit can lead to more severe engine damage and expensive repairs.
Yes, you can drive with the P0020 code. But driving with a P0020 code is not recommended as it can cause significant damage to your engine if left untreated. If your engine is experiencing the symptoms associated with this code, such as rough idling or decreased power and acceleration, it is best to have your vehicle inspected and repaired by a qualified mechanic as soon as possible. Ignoring this code can lead to more severe engine damage.