What is the P2004 fault number? What is the description of Intake Manifold Air Control Actuator Stealing / Open (Bank 1) malfunction? How do I fix the P2004 fault code What are the causes and symptoms of the P2004 error code?
What is the P2004 Fault code?
P2004 is a common fault code for transmission systems. P2004 is applicable to all vehicles made after 1996. However, the steps for repairing the vehicle may differ depending on its make and model. When the Bank 1 Intake Manifold Control Actuator is in the on position, the Vehicle Powertrain/ECU generates this fault code. Bank 1 means that the problem is in cylinder bank 1.
The IMRC system controls the airflow within the intake manifold, before it enters the engine. Controlling the engine’s air flow can reduce harmful emissions, increase fuel economy and improve the air/fuel combination. The solenoid in the IMRC system opens and closes the intake manifold’s vanes. This solenoid can be controlled by your primary computer, which is commonly known as the Powertrain Control Module (PCM).
The flow control solenoid opens and closes the metal flaps, which fit tightly to each cylinder’s intake port. These vanes are bolted along the length of the cylinder head to a thin rod of metal that runs through each inlet. All wings can be opened simultaneously and in one motion. This means that all blades can be opened simultaneously and in one motion if one gets stuck.
The IMRC solenoid is constantly monitored by the PCM. The PCM collects data from various sensors to determine the operation and performance of the IMRC system. At high speeds/RPM, the flaps will be open to allow air in. At low speeds/RPM, they will close to restrict airflow. The PCM can also detect other signs and issue a P2004 fault code. This will lighten the check engine light to alert the driver.
To ensure the IMRC system works properly, the PCM receives data via the IMRC position sensor and manifold absolute pressure sensor (MAP), intake air temperature sensor and throttle position sensor.
What are the symptoms of the P2004 Fault code?
- – Reduced engine performance, particularly at low engine speeds
- – High fuel consumption
- – Engine speed fluctuations
- – Intermittent flashing or continuous of the check engine light
What is the cause of the P2004 Fault code?
- – Defective IMRC solenoid
- – IMRC solenoid cables that have become shorted, broken, or corroded.
- – IMRC solenoid circuits, open or shorted
- – Corroded IMRC solenoid connecter
- – IMRC thumbscrews broken or loose
- Broken IMRC butterfly wings plates
- IMRC butterfly blade plates are separated from IMRC actuator
- – Clogged vacuum control solenoid vacuum filter
- – Residue in vacuum control solenoid
- – Vacuum lines that are disconnected or not connected
- IMRC butterfly wings plates – Carbon build-up
- – The PCM stores fault codes for exhaust gas recirculation valve faults (EGR).
- – MAF sensor fault codes saved by the PCM
- – BARO sensor fault codes saved by the PCM
- – Defective intake manifold vane position sensor
- – Defective MAP sensor
Diagnostics and Repairs for the P2004 Trouble Code
- – The OBD2 diagnostic tool should read the fault codes in the PCM. If fault codes are for the EGR valve or MAF sensor, these should be identified and repaired.
- – All cables should be checked visually for damage, wear and short circuits. It is necessary to replace or repair damaged, frayed, or shorted wires.
- Visually inspect the IMRC solenoid to determine if it is corroded or damaged.
- Connectors that are worn or damaged must be replaced
- – Check vacuum lines and hoses. Damaged or loose hoses need to be replaced or repaired.
- Check for cracks or ruptures in the connections between the IMRC butterfly wings plates.
- – Carbon buildup should be removed from the EGR valve. This carbon buildup could cause malfunctioning of the IMRC solenoid.
- All fault codes must be cleared.
The scanner can be used to turn the IMRC solenoid off and on. The IMRC solenoid should not respond to the scanner.
How serious is the P2004 fault code?
Engine damage can result from IMRC throttle plate slipping off the engine. It is vital that the P2004 fault codes be repaired and checked as soon as possible.
How to Fix the P2004 Fault Code
- – Replacing IMRC solenoid
- Repair or replacement IMRC solenoid wirings that have become frayed, shorted or broken
- – Replace or repair an open or shorted IMRC solenoid circuit
- – Replacement or repair of the IMRC solenoid connector.
- – IMRC butterfly valve plate hardware repair and/or replacement as required
- – Repair and replacement of vacuum lines that are damaged or missing
- – IMRC throttle plate plates need to be changed (intake manifold will also need to replaced).
- Diagnostics and repairs of EGR valves, MAF sensor, and/or BARO trouble code if applicable
