P1653 - FAULT CODE - OBD2

P1653 BUICK, CADILLAC, CHEVROLET, GMC: EGR VENT SOLENOID CONTROL CIRCUIT CONDITIONS

Using the EGR System (Exhaust Gas Recirculation) it is possible to increase fuel efficiency as well as improve engine emissions. To achieve this, the system reintroduces the air-fuel mixture, which, despite going through combustion, was not burned completely.

The exhaust gas recirculation system includes a valve known by the same name, which is controlled by vacuum solenoids and electric solenoids. The function of the ventilation solenoid is basically to expel the amount of unnecessary air into the exhaust system after it passes through the catalytic converter.

The DTC P1653 OBDII code is set by the PCM (Powertrain Control Module) when, with the ignition key on or the engine running, tests are performed on the vent solenoid, and these checks reveal that the voltage in the vent solenoid control circuit was high (12v), or with the requested vent solenoid off, the solenoid control circuit voltage was close to 0v.

• Check Engine light illumination.
• Reductions in engine power.
• Irregular engine operation.
• Limited acceleration.
• Reduced fuel efficiency.

P1653 OBD2 diagnostic code is set by one of the following factors:

• EGR vent solenoid control circuit wires or connectors may have been damaged.
• The Exhaust Gas Recirculation System vent solenoid may have deficiencies.
• EGR valve could have blockages.
• Vacuum lines could be leaking.

The corresponding steps to resolve the P1653 OBDII fault code are:

• Consult the Technical Service Bulletins as a first step.
• Inspect the EGR vent solenoid wiring and verify that these components do not present common damage due to wear or burns. If such conditions are discovered, make the appropriate repairs.
• Check for blockages or other damage to the EGR vacuum lines. If obvious deficiencies are found in the EGR vacuum lines, proceed with corrections.
• Inspect the Exhaust Gas Recirculation System valve and the EGR solenoid for integrity. In many cases, the valve may become blocked or the solenoid may be damaged by exposure to adverse conditions. Adjust it accordingly.