OBD Guide
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P138C

Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance

P138C is an OBD-II diagnostic trouble code meaning: Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance. Common causes: bypass valve position sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Reduced engine power
  • Increased fuel consumption
  • Unstable engine operation
  • Check Engine light comes on
  • Acceleration problems

Causes

  • Bypass valve position sensor malfunction
  • Open or short circuit in the sensor circuit
  • Bypass valve stuck or damaged
  • Problems with the sensor connector
  • Engine control unit malfunction

How to Fix

  1. Check the integrity of the sensor circuit
  2. Check the sensor connector for damage
  3. Check the operation of the bypass valve
  4. Replace position sensor if necessary
  5. Reset the error code and check if it returns

Related codes

P138BP138DP138A

FAQ

What does the P138C code mean?

P138C is an OBD-II diagnostic trouble code that indicates: Charge Air Cooler Bypass Position Sensor Minimum/Maximum Stop Performance

What causes a P138C error code?

The most common causes of P138C include: Bypass valve position sensor malfunction; Open or short circuit in the sensor circuit; Bypass valve stuck or damaged; Problems with the sensor connector.

How do I fix a P138C diagnostic trouble code?

To fix P138C: Check the integrity of the sensor circuit. Check the sensor connector for damage. Check the operation of the bypass valve. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P138C?

Yes, but get it checked soon

How much does it cost to fix P138C?

The estimated repair cost for P138C is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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