OBD Guide
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P174B

Valve 4 In The Sub-Gearbox 1 Electric Fault

P174B is an OBD-II diagnostic trouble code meaning: Valve 4 In The Sub-Gearbox 1 Electric Fault. Common causes: open or short circuit in valve circuit, poor contact in valve connector. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • Incorrect gear shifting
  • Check Engine light comes on
  • The gearbox goes into emergency mode
  • Problems engaging certain gears

Causes

  • Open or short circuit in valve circuit
  • Poor contact in valve connector
  • Solenoid valve malfunction
  • Problems with the transmission control unit

How to Fix

  1. Check valve circuit integrity
  2. Inspect connectors and contacts for oxidation
  3. Check valve resistance
  4. If necessary, replace the solenoid valve
  5. Scan the control unit for additional errors

Related codes

P174AP174CP174D

FAQ

What does the P174B code mean?

P174B is an OBD-II diagnostic trouble code that indicates: Valve 4 In The Sub-Gearbox 1 Electric Fault

What causes a P174B error code?

The most common causes of P174B include: Open or short circuit in valve circuit; Poor contact in valve connector; Solenoid valve malfunction; Problems with the transmission control unit.

How do I fix a P174B diagnostic trouble code?

To fix P174B: Check valve circuit integrity. Inspect connectors and contacts for oxidation. Check valve resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P174B?

Limited driving only, diagnose soon

How much does it cost to fix P174B?

The estimated repair cost for P174B is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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