OBD2 Code P0734: Automatic Transmission – Malfunction
Automatic transmission malfunction.
Detected Root Component
Powertrain Component
Observed Symptoms
- Engine light on (MIL/Check Engine)
- Transmission slippage
- Hard or abrupt gear shifting
- Transmission stuck in one gear
- Transmission fluid leak
Possible Causes
- Defective transmission solenoid valve
- Faulty transmission speed sensor
- Degraded transmission oil
- Damaged transmission harness
- Faulty TCM computer
Tools Required
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Parts likely to be the cause (Corps de papillon)
Corps de papillon
Photo d'illustration : Corps de papillon
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Frequently asked questions about code P0734
What does code P0734 mean? ▾
OBD2 Code P0734: Automatic Transmission – Malfunction. Automatic transmission malfunction.
What are the symptoms of code P0734? ▾
Code P0734 may cause: Engine light on (MIL/Check Engine), Transmission slippage, Hard or abrupt gear shifting, Transmission stuck in one gear. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code P0734? ▾
The most common causes of code P0734 are: Defective transmission solenoid valve, Faulty transmission speed sensor, Degraded transmission oil, Damaged transmission harness. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code P0734? ▾
Yes, code P0734 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code P0734? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Defective transmission solenoid valve, Faulty transmission speed sensor, Degraded transmission oil, Damaged transmission harness. Difficulty: Medium · Estimated time: 30-60min.