Error codes or Diagnostic Trouble Codes (DTC) consist of alpha and numeric characters that correspond to specific issues with the vehicle. Any time a DTC is tripped you will see the Check Engine Light (CEL) on your dash. Once you see a CEL it is important to use a scan tool to read your DTCs. If you do not own or have access to a OBDII scanner, most local auto parts stores have one you can use free of charge. Knowing the Error codes are essential for a couple of reasons. First, they are critical for trouble shooting because they will identify what is wrong with the vehicle. Second, our bypass kits are both vehicle specific and error code specific. That said, to confidently recommend the best solution for your vehicle we need Year/Model/Engine Size along with the specific DTCs. If you are looking to purchase a scan tool Hewitt Tech sells a variety of scanners from iCarsoft with features ranging from reading and clearing codes to accessing to live stream and freeze frame data. Click Here to view
Types of SAIS Failures and Error Codes
There is a limited set of DTCs the Secondary Air Injection System can trip. We have categorized them into 3 different types of failures: Mechanical, Electrical and Pressures Senor. This is important to note because Hewitt Tech bypass kits will only cover certain codes and kit addons maybe required to address other SAIS codes. Additionally, please be aware neglecting SAIS error codes, repeatedly clearing them and driving your vehicle with SAIS error codes can lead to further damage. This includes but not limited to damaging the factory wiring harness or even the Engine Control Module (ECM). If this were to occur the Hewitt Tech bypass kit will not address this damage.
Listed below are the most common SAIS error codes which can typically be addressed by the Hewitt Tech bypass or in combination with a kit addon. To confirm code coverage please refer to Bypass Kit Comparison Chart or specific product listing.
Mechanical codes are related to the moving components of the SAIS. For example, if the Air Pump fan is not functioning or the Air Switching Valve is stuck; you will get one of the following codes.
P1441 – Switching Valve No.2 Stuck Open Bank 1
P1442 – Switching Valve No.2 Stuck Close Bank 1
P1444 – Switching Valve No.2 Stuck Open Bank 2
P1445 – Switching Valve No.2 Stuck Close Bank 2
P2440 – Switching Valve Stuck Open Bank 1
P2441 – Switching Valve Stuck Closed Bank 1
P2442 – Switching Valve Stuck Open Bank 2
P2443 – Switching Valve Stuck Closed Bank 2
P2445 – Pump Stuck OFF Bank 1**
P2447 – Pump Stuck Off Bank 2
Electrical codes indicate an issue with the circuit within the SAIS components. Each Air Pump and Air Switching Valve has an electrical circuit. The following codes are usually caused by an open or short in these circuits.
P0412 – SAIS Switching Valve ‘A’ Circuit Malfunction Bank 1
P0415 – SAIS Switching Valve ‘B’ Circuit Malfunction Bank 2
P0418 – SAIS Circuit/Relay ‘A’ Circuit Malfunction Bank 1
P0419 – SAIS Circuit/Relay ‘B’ Circuit Malfunction Bank 2
Pressure Sensor Codes*
The following codes are directly associated with damaged Pressure Sensor(s). This is commonly caused by an Air Switching Valve being stuck open which exposes the Pressure Sensor to exhaust. These codes will put the vehicle into “Limp Mode” and will not clear until addressed.
P2431 – Air Flow / Pressure Sensor Circuit Range / Performance Bank1
P2432 – Air Flow / Pressure Sensor Circuit Low Bank 1
P2433 – Air Flow / Pressure Sensor Circuit High Bank 1
P2436 – Air Flow / Pressure Sensor Circuit Range / Performance Bank 2
P2437 – Air Flow / Pressure Sensor Circuit Low Bank 2
P2438 – Air Flow / Pressure Sensor Circuit High Bank 2
P106B – Pressure Sensor Correlation / Evap. Pressure Sensor
Other Reasons SAIS codes can be tripped
The primary reasons for SAIS error codes as discussed above is Mechanical, Electrical or Pressure Sensor failures. However, there are a few other causes that can trip SAIS DTCs. One of the most common is damage to the factory wiring harness that is plugged SAIS components. We have seen broken wires and wires which rodents have chewed through trip SAIS error codes. If not addressed timely, incorrect voltage or resistance across factory wiring harness can cause damage to the ECM. Again, the factory wiring harness and ECM must be in good working condition for the Hewitt Tech bypass to work properly and the bypass will not address SAIS codes caused by damage to factory harness or ECM.
Another factor we frequently see cause SAIS error codes is aftermarket SAIS components. This is because aftermarket parts are not made with the same high quality material factory or Original Equipment Manufacturers (OEM) parts are. Aftermarket parts may be cheaper, but they are cheaper for a reason and most likely will cost you more in the long run. If you are considering replacing the SAIS components do not make this mistake and use factory or OEM part. However, on average, replacing the Secondary Air Injection System can cost between $2,000 – $3,000. Unfortunately, even if you decide to replace these components it is likely you would run into the same issues in the future. That said, if you want to get out of Limp Mode, turn off your Check Engine Light, avoid future failures and save thousands of dollars; a Hewitt Tech Secondary Air Injection Bypass kit is what you need.
Other Common Codes
The Hewitt Tech bypass kit and kit addons are engineered to address a very specific set error codes related to the SAIS. Please understand that our solutions will not clear codes associated with the vehicles other systems. We have compiled a list of other common codes for reference on the Codes page or our website.
It is also strongly recommended that codes not related to the SAIS system be addressed before installing a Hewitt Tech bypass kit. This limits potential issues with trouble shooting and allows vehicles tests to complete after installation. There have been instances where SAIS codes would not clear until other codes were directly addressed.
Hewitt Technologies Secondary Air Injection Bypass Kit Solutions
To learn more about our different Bypass Kits and which one is best for you, read our Blog post Secondary Air Bypass Kit Comparison
What is the Secondary Air Injection System?
To learn more about purpose and components of the Secondary Air Injection System, read our Blog post What is the Secondary Air Injection System?
If you have any questions about your codes or our solutions do not hesitate to contact us. You can reach Customer Service and Technical Support at (844) 307-7671 Monday thru Friday 8:30am – 5:00pm ET. Or feel free to send us a message through our Contact Us page. Hewitt is here to help.