Engine-Codes - Nissan - P1138 2004 Nissan Sentra

P1138 2004 Nissan Sentra Code - Swirl Control Valve Control System Performance

- Code Popularity: 17,253 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1138 2004 Nissan Sentra?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Swirl Control Valve Control Position Sensor
  • Swirl Control Valve Control Position Sensor harness is open or shorted
  • Swirl Control Valve Control Position Sensor circuit poor electrical connection
  • Faulty Swirl Control Valve
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How to Fix the DTC P1138 2004 Nissan Sentra?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1138 2004 Nissan Sentra code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

The P1138 code is detected when the target opening angle of swirl control valve controlled by Engine Control Module (ECM) and the input signal from swirl control valve position sensor is not in the normal rang.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P1138 2004 Nissan Sentra Code Mean?

While idling and during low engine coolant temperature, the swirl control valve closes, Thus the velocity of the air in the intake passage increases, promoting the vaporization of the fuel and producing a swirl in the combustion chamber.
Because of this operation, this system tends to increase the burning speed of the gas mixture, improve fuel consumption, and increase the stability in running conditions.
Also, except when idling and during low engine coolant temperature, this system opens the swirl control valve.
In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow resistance, intake flow.
The swirl control valve is operated by the Engine Control Module (ECM).

P1138 2004 Nissan Sentra Code - Swirl Control Valve Control System Performance

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