Fault code P2432 – secondary air injection system air flow/pressure sensor circuit low (Bank 1)

Fault code P2432 is called “Secondary Air Injection System Air Flow/Pressure Sensor Circuit Low (Bank 1)” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P2432

Error code P2432 refers to the secondary air injection system, which injects outside air into the exhaust system when starting a cold engine. This extra air helps to burn off the very rich exhaust gases that are produced when the engine is warmed up.

Fault code P2432 – secondary air injection system air flow/pressure sensor circuit low (Bank 1)

The secondary air injection system is based on either a belt-driven or electric pump. The pump forces ambient air into the engine exhaust system to reduce exhaust emissions.

Silicone-based, heat-resistant hoses are used to supply cold outside air to the pump. Ambient air is filtered prior to intake through an air filter housing designed specifically for the secondary air injection system.

Ambient air is supplied to the exhaust system through high-temperature silicone and steel tubing connected to holes in the exhaust pipes. One-way check valves are installed in each exhaust hose to prevent condensate from entering the pump and causing a malfunction.

The PCM controls the secondary air injection pump operation based on engine temperature, RPM and throttle position.

The air pressure sensor is used to control the inlet pressure of the air control solenoid valve. To open and close the valve at specified temperatures and pressures according to the manufacturers recommendations.

If the PCM detects a low voltage or resistance signal in the secondary air injection system flow/air pressure sensor circuit. Code P2432 will be stored and the Malfunction Indicator Light (MIL) may illuminate.

On some vehicles, the pressure sensor is part of the air control solenoid valve.

Symptoms of vehicle malfunctions

The main signal that an error P2432 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. The “Check engine” control lamp on the control panel will light up (the code will be stored as a fault).
  2. On some European vehicles, the contamination control light will illuminate.
  3. Noise from air pump due to mechanical wear or presence of foreign objects in it.
  4. The engine does not accelerate well.
  5. The engine is stalling or does not start well.
  6. Floating revolutions, as well as attempts to stall at idle.
  7. Sometimes there may be no symptoms, despite the stored fault code.

The severity of error P2432 varies from moderate to severe, depending on the specific symptoms of the malfunction. In some cases, driving with this fault can be extremely dangerous.

Factors that can cause this error code

The error code P2432 can mean that one or more of the following problems have occurred:

  • The secondary air injection pump is defective.
  • Pump check valves have failed.
  • Secondary air injection pump relay is defective.
  • Problem with control solenoid.
  • Air pressure sensor is defective.
  • Moisture in pump and motor.
  • Interruption or interruption of secondary air injection system power supply.
  • Blown secondary air injection fuse.
  • Sometimes the cause is a defective PCM module.

How to fix or reset OBD-2 code P2432

Some suggested steps for troubleshooting and fix the error code P2432:

  1. Connect the OBD-II scanner to the vehicle’s diagnostic connector and read all stored data and error codes.
  2. Before you continue diagnosing the P2432 code, clear any other errors that may be present.
  3. Visually inspect the electrical wires and connectors related to the secondary air injection system.
  4. If necessary, repair or replace any shorted, broken, damaged, or corroded components.
  5. Check the secondary air injection pump.
  6. Test the air pressure sensor.

Diagnose and repair of problems

The first step in the P2432 troubleshooting process is to review the Technical Service Bulletins (TSB) for your particular vehicle. In some cases, this can save a lot of time guiding you in the right direction.

Next, check the electrical, which includes the secondary air injection pump, check valve, pressure sensor, air control valve, and PCM. Conduct a thorough visual inspection of the wiring for obvious defects.

Then check the connectors and connections for safety, corrosion, and damaged contacts. This process should include all circuit connectors and connections to all components, including the PCM.

Check the check valve to make sure the air flow is in one direction only. Condensation is a sign of a faulty one-way check valve, allowing it from the exhaust to enter the pump.

Voltage check

If the air pump does not turn on, check all relevant fuses, relays, wiring, and pump motor for continuity. If necessary, replace or repair failed components.

Integrity tests should always be performed with the power supply disconnected. Normal resistance readings for wiring and connections should be 0 ohms.

Resistance or lack of continuity is a sign of faulty wiring, opens, shorts, or corrosion that should be repaired or replaced.

If all tests are passed and code P2432 continues to appear, there is most likely a faulty secondary air injection pressure sensor. But PCM malfunction should also not be ruled out until the pressure sensor is replaced.

On which vehicles does this problem occur most frequently

Fault code P2432 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Chevrolet (Cobalt)
  • Lexus (GX460)
  • Volkswagen (Jetta, Passat)

Fault code P2432 can sometimes be found with other errors. The most common are the following: P0411, P0491, P0721, P2430, P2431, P2433, P2434, P3433.

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