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P0746 stuck OFF = no line pressure. Trans will slip, take a long time to engage, or feel like it's in neutral. Driving on a P0746 burns clutches in minutes - do not drive far. Tow or trailer to the shop. EPC solenoids on Amazon ↑
🗺️ Where Is the Problem?
Blueprint view - P0746 fault localized to the transmission control system / solenoid body
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0746 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
65%
#1 - Most Likely
Stuck EPC Solenoid (Off Position)
The pressure-control solenoid pintle is stuck open or weak, dropping line pressure. Often caused by debris in the fluid - a sign that internal wear is also present. Solenoid replacement plus filter mandatory.
🔩 Part
$80–$300
👨🔧 Labor
$400–$900
⚡ DIY Difficulty
Hard
25%
#2 - Check First
Internal Hydraulic Leak
A worn valve body, leaking sealing rings, or worn separator plate dumps pressure as fast as the pump builds it. Valve body rebuild required.
🔩 Part
$200–$700
👨🔧 Labor
$600–$1,400
⚡ DIY Difficulty
Hard
10%
#3 - Less Common
Worn Pump / Low Fluid
A failing pump or low ATF level cannot generate enough pressure no matter what the solenoid does. Always verify fluid level first - this is the cheapest possible fix.
🔩 Part
$30–$500
👨🔧 Labor
$80–$1,200
⚡ DIY Difficulty
Medium
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Verify fluid level on a level surface - Engine warm, in neutral or park per service manual. Low fluid alone causes P0746 symptoms and may save you a $1,000 repair if topping off recovers normal operation.
- Inspect pan magnet for debris - Heavy clutch material or metallic shavings = internal wear, not just a solenoid. Plan accordingly - a fresh solenoid alone won't survive long in a worn trans.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need