OBD Guide
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P174C

Partial Transmission 1 Valve 2 Electrical Error

P174C is an OBD-II diagnostic trouble code meaning: Partial Transmission 1 Valve 2 Electrical Error. Common causes: open or shorted valve circuit, oxidation of contacts. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Incorrect gear shifting
  • Switching to emergency mode of automatic transmission
  • Check Engine Light Illuminates
  • Power Loss
  • Jerks when shifting gears

Causes

  • Open or shorted valve circuit
  • Oxidation of contacts
  • Solenoid valve malfunction
  • Problems with the transmission control unit
  • Wiring harness damage

How to Fix

  1. Check the integrity of wiring and contacts
  2. Measure valve resistance
  3. Check power supply at valve connector
  4. Replace faulty valve if necessary
  5. Flash the control unit if necessary

Related codes

P174AP174BP174D

FAQ

What does the P174C code mean?

P174C is an OBD-II diagnostic trouble code that indicates: Partial Transmission 1 Valve 2 Electrical Error

What causes a P174C error code?

The most common causes of P174C include: Open or shorted valve circuit; Oxidation of contacts; Solenoid valve malfunction; Problems with the transmission control unit.

How do I fix a P174C diagnostic trouble code?

To fix P174C: Check the integrity of wiring and contacts. Measure valve resistance. Check power supply at valve connector. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P174C?

Limited driving only, diagnose soon

How much does it cost to fix P174C?

The estimated repair cost for P174C is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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