Engine-Codes - Volvo - P1238 Volvo

P1238 Volvo Code - Turbocharger Control valve

- Code Popularity: 31,497 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
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What are the Possible Causes of the DTC P1238 Volvo?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Air leakage after turbocharger
  • Hoses between turbocharger and turbocharger control valve are loose, blocked or damage
  • Hoses between turbocharger control valve and pressure servo are loose, blocked or damage
  • Faulty turbocharger control valve
  • Faulty boos pressure control valve pressure servo
  • Sticking boost pressure control valve

Code Tech Notes

First step is checking for air leak after turbocharger.

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How to Fix the DTC P1238 Volvo?

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 P1238 Volvo 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.

What are Code Possible Symptoms?

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

What Does the P1238 Volvo Code Mean?

The code O1238 will set if RPM is above 3500 and engine is operating at a high load, control signal to turbocharger control valve is at maximum and boos pressure from boos pressure sensor is lower than approximately 2.9 psi under normal boost pressure (signal too low. If mass from mass air flow sensor is high than desired value (signal too high) it is interpreted as a fault by the Engine Control Module (ECM). When the code is set, a reduce boos pressure is used as a substitute value.

P1238 Volvo Code - Turbocharger Control valve

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