P2448 - OBD Trouble Code

Want to learn something more about the P2448 fault code? If you hear a hissing or chugging sound from under the hood, there might be an issue with the AIR pump and hoses along with issues with the air injection system circuit problem, thus leading to OBD code P2448 getting stored in the Powertrain Control Module.

What causes this problem with the Secondary Air Injection System High Air Flow Bank 1?

• There might leakages in the secondary air system
• There can be opened or shorted air flow sensor harness
• Air flow sensor circuit inferior electrical connection
• Imperfect air flow sensor

1. Engine Control Module - Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Powertrain Control Module - If the PCM is faulty, it can stores wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus replace it immediately.
3. Air Control Valve Relay - The valve relay can also be damaged causing air intake problems. Replace faulty valve relays. Buy now!
4. Exhaust System Parts - A burning smell of the engine is likely to be seen as soon as there is a fault in any of the exhaust system parts. Also, performance issues are likely to arise due to a failure in the exhaust manifold. A leak or crack also leads to a reduction in the power, acceleration and efficiency of the vehicle. Repair or replace now.
5. Air Injection Check Valve - Faulty check valve may lead to water or moisture entering the pump. Thus, if the valve is faulty/damaged, it’s time to replace it now!
6. Electronic Control Unit - If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
7. Diagnostic Tool - Choose from our diagnostic tools collection that will come handy to detect and correct the OBD error code.
8. Air Injection Pump - Inspect for faulty air injection pump and replace it at first instance. Buy new air pump now!

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• It is essential to restore the flawed air pump check valve
• The malfunctioning air pump should be repaired or replaced as per the need
• The secondary air system parts should be restored to working order
• It is necessary to perform proper service of the unsound PCM/ECM

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of pcm, exhaust system parts, vacuum hose, pressure sensor, air injection pump, air injection system parts, air pump fuse, air pump assembly, air pump control valve, air injection check valve and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

Diagnosis by inspecting system wiring and connectors and the serpentine belt which drives the pump (if applicable). Repair or replace open circuits as required and retest the system.

If the pump is belt driven, and the belt is missing or otherwise defective, replace it before proceeding. Make sure that the pump will spin freely by hand before replacing the belt. Pump failure is relatively common in high mileage vehicles.

If the SAI pump is driven by an electric motor, I like to check system fuses and relays at this time too. If a visual inspection leads to no obvious malfunctions, connect the scanner to the vehicle diagnostic port and retrieve all stored codes and freeze frame data. This information may come in handy in my diagnosis, so I like to write it down.

Now, clear the codes and test drive the vehicle to see if the P2448 is reset. Consult your vehicle information source to search technical service bulletins (TSB) for entries that match the code/s and symptom/s exhibited by the vehicle in question. Since TSBs are comprised using data from hundreds-of-thousands of repairs, the information contained therein can be very helpful in reaching a successful diagnosis.

In extreme cold weather conditions, belt driven SAI pumps are prone to lockup due to frozen condensation. Typically, a one-way check valve is integrated into the air inlet hose to prevent condensation from reaching the SAI pump. The one-way check valves fail regularly and permit condensation from the exhaust to enter the SAI pump. Once the condensation freezes, the ice either seizes the SAI pump (belt driven) or causes it to bind and blow a fuse (electric pump).

Use the scanner to actuate the electric SAI pump. Once the pump has been activated, use the DVOM to test voltage and ground at the SAI pump. If no voltage is detected, suspect a blown fuse or a bad power supply relay. If all fuses and relays are good, use the DVOM to check for an open circuit between the power supply source and the pump. Disconnect all related controllers before using the DVOM to check circuit resistance. If there is no ground detected, use your vehicle information source to locate the appropriate ground source and test voltage drop in the circuit.

Test the SAI pressure sensor using the DVOM and specifications located in the vehicle information source that you have chosen. Additional diagnostic notes: Blown fuses are usually a reaction to a shorted circuit and not the source of the malfunction Frozen pumps may be allowed to thaw before use to avoid catastrophic pump damage

Common Mistakes When Diagnosing The P2448 Code

• There are a lot of mechanics which simply replace the Secondary air injection pump without fabricating a water drain on the pump housing which might lead to repeated pump failure.
• One another important thing which the technicians should keep in mind is to check valves properly.

P2449 - Secondary Air Injection System High Air Flow Bank 2