P1122 - FAULT CODE - OBD2

POST UPDATED IN June, 2021

P1122 Code failures by brands

P1122 ACURA, HONDA: HIGHER THAN EXPECTED THROTTLE POSITION SENSOR SIGNAL

P1122 BMW, MINI: LOW INPUT FROM PEDAL POSITION 1.

P1122 BUICK, CADILLAC, CHEVROLET, FORD, GMC, PONTIAC, SATURN: LOW VOLTAGE INTERMITTENT

P1122 HYUNDAI: BOOSTER PRESSURE CONTROL VALVE

P1122 INFINITI, NISSAN: ELECTRIC THROTTLE CONTROL PERFORMANCE PROBLEM

Description of DTC code P1122

The throttle actuators are electrically controlled. They began to be used as a replacement for mechanical linkages such as control cables that adjusted the opening and closing of the throttle. This system, which is also known as DBW (Drive By Wire), uses Throttle Position Sensors (APP) to control the movement of the throttle pedal. These sensors or potentiometers get power from the PCM (Powertrain Control Module) through a current of 5 volts.

As soon as the throttle is closed, the sensor resistance is extremely low, so the reference voltage is returned to the PCM. Once the pedal is pressed, the sensor resistance increases in direct proportion to the amount of pedal movement. These varying signals are used by the PCM to calculate the most suitable throttle openings, which are achieved through signals sent by the control module to a stepper motor, which is built into the throttle body.

If the PCM cannot have effective throttle control, the fault code P1122 OBDII will be set.

Symptoms of fault code P1122

  • Check Engine lamp illuminated.
  • Stored multiple fault codes related to the erroneous throttle position sensor and accelerator pedal position sensor
  • Difficult to start the engine.
  • Idle irregularities.
  • The engine can be stopped at low speeds.
  • Hard gear changes.
  • There is little or no throttle response.
  • Remarkable loss of engine power.
  • Fail-safe mode activated.

Causes of OBD2 P1122

The reasons for setting the diagnostic code P1122 OBD2 are

  • The circuit may have bad wires or connectors.
  • The throttle plate may have excessive carbon build-up.
  • The Throttle Position Sensor may be in bad condition.
  • The Throttle Position Sensor may be defective.
  • The throttle body may be worn out.

Possible solutions of the DTC code P1122

The steps to follow to correct the DTC code P1122 OBDII are the following:

  • As a first diagnostic step, you should consult the TSB (Technical Service Bulletins).
  • Check all components of the system's electrical circuit. If there is damage such as worn wires or corroded connectors, make any necessary repairs or changes.
  • Check the throttle plate to make sure that it is not stuck by high levels of carbon. Carry out the appropriate maintenance.
  • Verify the good condition of the components of the throttle body. If you discover wear damage or other inconsistencies in them, make the appropriate repairs.
  • For a diagnosis of the APP Sensor and the TPS, consult the steps indicated in the service manual to know the electrical values corresponding to these sensors. If these do not comply with the specifications, you must repair or replace them as appropriate.

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