Nissan’s P1138 Code is a diagnostic trouble code that typically indicates a malfunction with the swirl control valve control performance. This code can be triggered when the engine is running at cruise speed and then goes back to idle, and the Powertrain Control Module (PCM) detects that the actual swirl valve control position sensor value does not match the target opening angle that is controlled by the PCM. Several factors, including an open or shorted swirl control valve circuit, a contaminated, damaged, or failed swirl control valve, or a failed PCM, can cause this. By understanding this code’s potential causes and solutions, Nissan owners can better diagnose and repair the issue.
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Causes and Solutions for Nissan Code P1138
| Cause | Solution |
|---|---|
| The Swirl Control valve circuit is open or shorted (intermittent fault) | Check the wiring and connections of the swirl control valve and replace any faulty or damaged parts. |
| The Swirl Control valve is contaminated, damaged, or has failed | Physically inspect the swirl control valve and replace it if it is contaminated, damaged, or has failed. |
| PCM has failed | Replace the PCM if it has failed. |
| Poor connection of the powertrain control module | Check the connection of the powertrain control module and ensure that it is securely connected. |
Open and Short Circuit in Swirl Control Valve Circuit
One potential cause of Nissan Code P1138 is an open or short circuit in the swirl control valve circuit. A number of factors, such as faulty wiring, damaged connectors, or a failed component, can cause this. To diagnose this issue, you should first check the wiring and connections of the swirl control valve. If any parts are found to be faulty or damaged, they should be replaced.
📢Read also: Nissan Code B2609
Contamination or Damage to Swirl Control Valve
Another potential cause of Nissan Code P1138 is contamination or damage to the swirl control valve. A number of factors, such as dirt or debris buildup or damage from an accident, can cause this. To diagnose this issue, you should visually inspect the swirl control valve and replace it if it is contaminated, damaged, or has failed.
Poor Connection of Powertrain Control Module
The poor connection of the powertrain control module can also cause Nissan Code P1138. A loose connection or damaged wiring can cause this. To diagnose this issue, you should check the connection of the powertrain control module and ensure it is securely connected.
Conclusion: Solve Nissan Code P1138 with Professional Diagnosis
Nissan Code P1138 is a diagnostic trouble code that typically indicates a malfunction with the swirl control valve control performance. This code has several potential causes, including an open or shorted swirl control valve circuit, a contaminated, damaged, or failed swirl control valve, or a failed PCM. By understanding this code’s potential causes and solutions, Nissan owners can better diagnose and repair the issue. Professional diagnosis is essential to diagnose and solve Nissan Code P1138 properly.