P1220 - FAULT CODE - OBD2

POST UPDATED IN October, 2021

P1220 Code failures by brands

P1220 BUICK, CADILLAC, CHEVROLET, GMC, ISUZU: THROTTLE POSITION SENSOR CIRCUIT 2

P1220 FORD, LINCOLN: SERIAL THROTTLE CONTROL FAULT DETECTED

P1220 HONDA: SERIES THROTTLE CONTROL SYSTEM MALFUNCTION

Description of DTC code P1220

The TPS (Throttle Position Sensor) is an electrical device that is installed on the throttle body of the TAC (Throttle Actuator Control) assembly. It controls the air entering the engine and detects the position of the throttle.

This sensor basically consists of 2 individual sensors that detect throttle position. They are located inside a housing. Two separate signal circuits are used along with a low voltage reference circuit and a 5-volt circuit to connect the TPS and TAC assembly. The Throttle Position Sensor has increases in its signal voltage, depending on the throttle opening, with its maximum voltage being its 5V reference voltage.

The P1220 OBDII diagnostic code is a manufacturer-specific code that relates to a failure of the Throttle Position Sensor or the system that regulates the performance of the Throttle Position Sensor. It is necessary to consult the source of information to know how it is applied by the manufacturer.

Symptoms of fault code P1220

  • Check Engine light ON.
  • Misfiring.
  • Exhaust emissions have an increase.
  • Poor acceleration.

Causes of OBD2 P1220

Reasons to set the P1220 OBD2 DTC P1220 OBD2 code:

  • Wires or connectors in the Throttle Position Sensor circuit may have common damage.
  • The throttle position sensor may be in bad condition.
  • The throttle body may have worn gears.

Possible solutions of the DTC code P1220

To troubleshoot the P1220 OBDII fault code, try this:

  • To start the diagnosis, consult the Technical Service Bulletins.
  • Check whether other error codes in addition to P1220 are set. In this case, perform the diagnosis of the codes following the order shown by the scanner.
  • Check the condition of the throttle position sensor and throttle actuator control wiring. If common damage is found in one of these, make repairs.
  • Once you find the Throttle Position Sensor, verify that its circuit voltages match those specified by the manufacturer. Note that the reference voltage varies with throttle position. Repair if inconsistencies are detected.
  • Check the integrity of the throttle position sensor and the CT motor. If one of these is deficient, replace it.

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