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The P2440 GMC Terrain Engine Code: What You Need to Know

Your GMC Terrain is designed to operate efficiently and trouble free. However, like any vehicle, there will be various maintenance issues that arise during the lifetime of your GMC Terrain. One issue is the P2440 engine code.

The P2440 is a numeral designation that indicates a diagnostic trouble code. The Powertrain Control Module (PCM) detects when the switching valve of the secondary air injection system is stuck in an open position on Bank 2. The “Bank” means either side of the engine designated as Bank 1 and Bank 2.

What Does the P2440 Code Mean?

The exhaust system receives fresh air pumped in by the secondary air injection system. The secondary air injection system acts as a reduction mechanism for pollutants and contaminants as they are emitted via the exhaust system.

Your GMC Terrain has a PCM which acts as a sort of brain for the engine. The PCM receives information from different sensors in your GMC Terrain which helps it manage the engine, transmission and other systems of your vehicle. The secondary air injection system delivers information about air pressure and flow status to the PCM.

When the secondary air injection system sends a voltage signal to the PCM that is greater than the manufacturer’s specs, the P2440 GMC Terrain trouble code is tripped and logged. When this happens the Check Engine Light illuminates, notifying you that a P2440 diagnostic code is stored in the vehicle’s computer.

Signs of the P2440 Being Activated

While the Check Engine Light and diagnostic test can identify the P2440 code activation, there are some other noticeable indications that may be related to the issue. Signs you may notice include:

  • When idling, the engine may stutter or stall.
  • While driving and accelerating, the vehicle may pull back or hesitate.
  • During starting your GMC Terrain, the engine might stall.
  • Running a check on the PCM will show the P2440 code logged.

Reasons the P2440 Code is Activated

There are several reasons that the P2440 code will be stored and activated. The PCM keeps a log of the P2440 and all other trouble codes until it is reset. The common causes that activate a P2440 trouble code are:

  • A faulty air injection valve, one way check valve, or air injection pump.
  • Indications of a faulty pressure sensor – The wiring may be frayed or damaged. Another problem could be the pressure sensor connector is damaged. Bent pins on the pressure sensor connector could also be an issue.
  • Bad vacuum switching valve – Broken or damaged wiring can be a problem that trips the P2440 code. As with the pressure sensor, the connector of the vacuum switching valve may be damaged or have bent pins.

Diagnosing a P2440 Code

When you take your GMC Terrain to a mechanic they will use tools and instruments to diagnose the problem. A partial checklist of troubleshooting the P2440 code issues is as follows:

  1. The first and most common step in the diagnostic process is a mechanic will use a device called an OBD – II scanner to collect data that is logged by the PCM. Trouble codes and other information will help pinpoint the issue.
  2. A mechanic will clear all the diagnostic codes and run the vehicle to see if the P2440 code is activated again.
  3. Checking the pressure sensor, vacuum switching valve, one way check valve, and air injection system for damaged wires, blown fuses, and other damaged components that need repair. Replaces parts as needed.
  4. The PCM is often cleared of trouble codes and re-checked several times throughout this service. It is helpful to do this to narrow down mechanical issues in the various systems affected by this code.

Is a P2440 Code Serious?

Some codes may be minor and have little effect on primary vehicle operations while other codes should be addressed immediately. Some of the most noticeable symptoms of the P2440 GMC Terrain trouble code are hesitation and stalling when driving or idling your vehicle. This should be addressed as soon as possible because it can be hazardous to drive under this condition. For your own and others safety it is recommended to fix the problems immediately.

Repairing Problems of the P2440 Code

Luckily, fixing the problems associated with the P2440 code is relatively easy. Replacing old damaged wires of related components may be necessary. Certain components like the pressure sensor, vacuum switching valve, air injection pump, air injection valve, or one way check valve might need to be replaced. Once the root of the problem is identified a more accurate maintenance service can be offered.

Related Questions

Are there certain makes and models of vehicles that have more instances of the P2440 code?

While the code occurs in many vehicles there are some automobiles that tend to have this trouble code appear more frequently. These makes and models include:

  • GMC Terrain
  • Some Mercedes
  • Chevrolet (Chevrolet Impala, Cobalt, Equinox)
  • Subaru (Forester)
  • Volkswagen (Jetta)
  • Lexus
  • Toyota (Toyota Land Cruiser, Prado, Takoma, Tundra)

What is the secondary air injection system?

The secondary air injection system works towards the reduction of hydrocarbon exhaust emissions when your engine is conducting a cold start-up. This happens when the start-up engine coolant temperature is 5 to 50 degrees Celsius or 41 to 122 degrees Fahrenheit. It also happens when the intake air temperature is 5 to 60 degrees Celsius or 41 to 140 degrees Fahrenheit. The pump kicks in 5 to 60 seconds after engine start-up.

Can I fix the code myself?

You can attempt to troubleshoot and fix mechanical issues related to the P2440 code if you feel competent enough to do so. It may be a more involved fix that a trained mechanic can identify and resolve better. Look for a professional automotive technician in your area to help you address this issue. The diagnosis of issues typically only will cost an hour of labor. Be sure to find out specifics as this amount can vary based on location and your vehicle’s make, model, and year.

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D Conroy

Meet our senior writer and content manager of Automasterx. He has worked in several mechanical garages and mastered different vehicle diagnoses and parts repair. He never stops until finding out the ultimate solutions for any vehicle fault code. However, ensuring the only solid solutions for each vehicle malfunction is his core part of the duty, alongside analyzing fault codes and signals.

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