P1111 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

P1111 Code failures by brands

P1111 ACURA, BUICK, CHEVROLET, GMC, HONDA, ISUZU, KIA, PONTIAC, SATURN, SUZUKI: INTAKE AIR TEMPERATURE SENSOR CIRCUIT INTERMITTENT HIGH VOLTAGE

P1111 AUDI, VOLKSWAGEN: HO2S CONTROL BANK 1 SYSTEM TOO LEAN

P1111 CADILLAC, DODGE: INTAKE AIR TEMPERATURE SENSOR CIRCUIT INTERMITTENT HIGH VOLTAGE CODE

P1111 FORD, JAGUAR: CAT SYSTEM FAULT.

P1111 HYUNDAI: HO2S NO ACTIVITY DETECTED IN ECM.

P1111 INFINITI, NISSAN: INTAKE VALVE TIMING CONTROL SOLENOID VALVE CIRCUIT BANK 1.

P1111 SUBARU: ATMOSPHERIC PRESSURE SENSOR CIRCUIT MALFUNCTION HIGH INPUT

Description of DTC code P1111

The intake valve timing control solenoid is activated by the ECM (Engine Control Module) through some on/off signals. It changes the amount of oil as well as the course of stream through the intake valve timing control unit. When the pulse width is longer, the valve angle is more advanced. If the pulse width is shorter, the valve angle will be delayed.

The setting of fault code P1111 OBDII occurs when the signal received by the ECM from the intake valve timing control solenoid valve has an incorrect voltage.

Symptoms of fault code P1111

  • Check Engine Lighting.
  • The engine shows a remarkable loss of power.
  • Engine instability during idling.

Causes of OBD2 P1111

The reasons for setting the diagnostic code P1111 OBD2 are

  • Engine oil or filter may have contamination levels.
  • The wiring harness of the intake valve timing solenoid may be damaged, causing a short or open circuit.
  • The intake valve timing solenoid may be in bad condition.

Possible solutions of the DTC code P1111

To solve the DTC code P1111 OBDII, take into account the following:

  • As a first step, consult the TSB (Technical Service Bulletins).
  • Check the engine oil for contaminants. If you discover such inconsistencies, replace the oil along with the filter.
  • Check the wiring that is related to the intake valve timing control solenoid valve for damage such as burns or wear. Similarly, check the cable connectors are not corroded. Repair as necessary.
  • Consult the vehicle's information source for specific steps of the intake valve timing solenoid. If you realize it is defective, replace it.

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