OBD2 code P1603: Manufacturer specific - Transmission
Manufacturer specific transmission fault.
Detected Root Component
Powertrain Component
Observed Symptoms
- Transmission slippage
- Hard or abrupt gear shifting
- Transmission stuck in one gear
Possible Causes
- Defective transmission solenoid valve
- Faulty transmission speed sensor
- Faulty TCM computer
Tools Required
Interactive Diagnostic
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Parts likely to be the cause (Moteur (général))
Moteur (général)
Photo d'illustration : Moteur (général)
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Frequently asked questions about code P1603
What does code P1603 mean? ▾
OBD2 code P1603: Manufacturer specific - Transmission. Manufacturer specific transmission fault.
What are the symptoms of code P1603? ▾
Code P1603 may cause: 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 P1603? ▾
The most common causes of code P1603 are: Defective transmission solenoid valve, Faulty transmission speed sensor, Faulty TCM computer. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code P1603? ▾
Yes, code P1603 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code P1603? ▾
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, Faulty TCM computer. Difficulty: complex · Estimated time: 30-60min.