Fault code P2677 is called “Air Cleaner Inlet Control Circuit High” 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 P2677
A stored P2677 code means that the powertrain control module (PCM) has detected a fault. Which is related to a high signal level in the air cleaner inlet control circuit.
Modern vehicles of some makes are equipped with an air cleaner intake system that controls air flow. Air flows through the intake air duct and directly to the throttle body, as well as the mass airflow sensor.
When the ignition key is turned to the ON position and voltage is applied to the various on-board controllers (including the PCM). Numerous self-diagnostic routines are started.
The PCM uses input signals from the engine sensors to automatically adjust the engine starting strategy and perform these self-tests. The air cleaner intake control circuit is one of the input signals required by the PCM for automatic tuning.
If the PCM detects a high signal level of the air cleaner inlet duct control circuit input signal. When the ignition switch is set to ON and voltage is applied to the PCM. Code P2677 will be stored and the malfunction indicator lamp may illuminate.
Not all first faults will set the code and illuminate the check lamp. In some cases, it takes several fault cycles before the indicator lamp will turn on.
Symptoms of vehicle malfunctions
The main signal that an error P2677 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.
It can also be warning signs such as:
- The “Check engine” control lamp on the control panel will illuminate (the code will be stored as a fault).
- There may be no symptoms other than the stored fault code.
- Longer than normal engine starting time.
- Floating revolutions, and attempts to stall while idling.
- Increased fuel consumption.
Fault P2677 is usually a moderate error, but can sometimes be serious depending on the specific symptoms of the malfunction. Therefore, when a problem is detected, it is recommended that the error is corrected as soon as possible.
Factors that can cause this error code
The error code P2677 can mean that one or more of the following problems have occurred:
- Faulty air cleaner intake regulator.
- Corroded or damaged connector.
- Faulty or damaged wiring.
- Damaged or clogged air duct.
- Sometimes faulty PCM module is the cause.
How to fix or reset OBD-2 code P2677
Some suggested steps for troubleshooting and fix the error code P2677:
- Read all stored data and error codes with an OBD-II scan tool. To find out when and under what circumstances fault P2677 appeared.
- Clear the error codes from the computer memory and test-drive the vehicle to find out if the fault appears again.
- Visually inspect the electrical wires and connections related to the air cleaner intake regulator for looseness and damage.
- Clear the error code from the computer memory again, test drive the vehicle to see if the problem is resolved.
Diagnose and repair of problems
The first step in the P2677 troubleshooting process, is to review the maintenance bulletins (TSB). In some cases, this can save a lot of time in the long run by pointing you in the right direction.
The next step in diagnosis will be a visual inspection of the relevant harnesses and connectors. You should pay particular attention to the wiring near hot exhaust components and sharp edges.
If there is nothing wrong with the wiring, check the hoses for blockages or breaks and clean or replace them if necessary. High temperature silicone hoses should be used for replacement.
By following all the recommendations, the P2677 fault will most likely be corrected and will go away. If it does not, the problem may be a faulty PCM module.
On which vehicles does this problem occur most frequently
Fault code P2677 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:
- Ford
- Mazda
Fault code P2677 can sometimes be found with other errors. The most common are the following: P2675, P2676.
