P0746 Code — Pressure Control Solenoid Performance/Stuck Off — Diagnosis & Fix Guide (2026)

Quick 60‑Second Check

1. Check Engine Light – The MIL is usually steady for P0746. A flashing light signals a more severe fault.
2. Feel for hard shifting – A clunk or delayed gear engagement points to a stuck‑off solenoid.
3. Grab a scan tool – Pull the DTC and watch the PWM duty cycle. A value stuck at 0 % while the PCM commands 80 % is a clear sign.

If any of these symptoms appear, continue with the full diagnostic flow.

What You’ll Experience on the Road

• Hard shifting – A noticeable “clunk” when the transmission tries to engage a gear.
• Transmission slipping – Engine revs rise but vehicle speed does not increase proportionally.
• Delayed engagement – A few seconds of engine revving before the vehicle moves out of park.
• Reduced fuel economy – The transmission stays in a lower gear longer, using more fuel.
• Transmission temperature rise – Prolonged slipping can overheat the fluid and trigger an over‑temperature warning.

These signs become more obvious under load, such as hill climbs or towing.

Why P0746 Happens (Root Causes)

Diagnostic Flow (Easy → Hard, Cheap → Expensive)

1. Visual Inspection & Loose Connections

Tools: flashlight, 10 mm socket, safety gloves.

• Safety first: Park on level ground, engage the parking brake, and place wheel chocks. Disconnect the negative battery terminal to avoid accidental shorts.
• Locate the transmission fluid dipstick. Verify the fluid is at the “full” mark and looks clean (no metal particles).
• Inspect the solenoid wiring harness for corrosion, frayed wires, or loose pins. Tighten any loose connections with a socket.

Result: Clean fluid and tight connectors let you move to the next step. If fluid is low or dirty, top off with the correct OEM fluid and re‑test.

2. Scan Tool Live Data Review

Tools: OBD‑II scanner capable of displaying transmission PID 0x23 (solenoid PWM).

• Connect the scanner, select “Transmission” → “Solenoid PWM” while the vehicle idles.
• Shift from Park → Drive and watch the PWM duty cycle. It should rise from 0 % to the commanded value (usually 60‑90 %).

Result: A PWM that stays at 0 % or jumps erratically points to a solenoid or wiring issue.

3. Solenoid Voltage Test

Tools: Digital multimeter, 10 mm socket.

• With the ignition ON (engine off), locate the solenoid’s power feed—typically a 12 V line.
• Back‑probe the connector and measure voltage while the PCM commands the solenoid (shift from Park to Drive).

Result: Presence of ≈12 V when commanded indicates the PCM output is healthy. No voltage or intermittent voltage suggests wiring or PCM problems.

4. Solenoid Resistance Check

Tools: Digital multimeter, 10 mm socket.

• Disconnect the solenoid connector and remove the solenoid from the valve body.
• Measure resistance across the coil terminals. Most OEM solenoids read 20 Ω – 30 Ω (verify with the service manual for your specific make).

Result: Resistance within spec means the coil is intact. An open circuit (∞ Ω) or very low resistance (<5 Ω) flags a faulty solenoid.

5. Replace or Re‑seal the Solenoid

If steps 3 or 4 reveal out‑of‑spec values, replace the solenoid.

• Drain a small amount of transmission fluid to avoid spillage.
• Remove the old solenoid using the appropriate socket (often 10 mm).
• Install the new solenoid, torque the mounting bolt to 10 Nm (common spec for many models).
• Re‑fill any lost fluid and verify the level.

Result: After replacement, repeat the voltage and PWM tests. The duty cycle should now follow the PCM command.

6. (Optional) Valve‑Body Pressure Test

When the solenoid checks out but the code persists, a professional pressure test of the valve body is recommended. This step requires a shop‑level test kit and is beyond most DIY capabilities.

Cost Breakdown

If the transmission fluid also needs a flush, add $80‑$120 for fluid and labor.

Vehicles Most Frequently Affected

• Toyota – Camry (2.5 L) and Corolla (1.8 L) with the Aisin transmission.
• Honda – Accord (2.4 L) and Civic (1.5 L) equipped with the 5‑speed automatic.
• Ford – F‑150 (3.5 L EcoBoost) and Explorer (3.5 L) using the 6R140 transmission.
• Chevrolet – Silverado 1500 (5.3 L) and Malibu (2.0 L) with the 6T70 transmission.

These models share similar solenoid designs, making P0746 a recurring issue.

Make‑Specific Fixes

Toyota

The 4‑cylinder Camry (2.5 L) often suffers a clogged pressure‑control solenoid due to degraded fluid seals. Replacing the solenoid (≈ $90 at a Toyota dealer) and refilling fresh fluid usually resolves the issue. Labor is modest because the solenoid is accessible from the top of the transmission.

Honda

Honda Accord (2.4 L) models frequently develop a cracked wiring harness near the solenoid connector, especially after 100 k mi. Repairing the harness costs $40‑$60 for parts plus $80 labor. A new solenoid is rarely needed unless the harness is severely damaged.

Ford

Ford F‑150 (3.5 L EcoBoost) with the 6R140 can develop a stuck‑off solenoid when metal shavings contaminate the valve body. A professional cleaning and replacement of the solenoid (≈ $130) typically restores proper pressure. Expect $150‑$200 labor at an independent shop.

Chevrolet

Chevrolet Silverado 1500 (5.3 L) often shows P0746 when the transmission fluid is overdue for change, causing the solenoid to seize. Flushing the system and installing a fresh solenoid ($110) usually fixes the problem. DIY total stays under $200.

Emissions Impact

A stuck‑off pressure‑control solenoid can cause the transmission to stay in a lower gear longer, raising fuel consumption and CO₂ output. In many states, this can lead to a failed emissions inspection because the vehicle’s exhaust readings exceed allowable limits. Fixing the solenoid restores proper gear ratios, improves combustion efficiency, and helps the vehicle pass the emissions test.

Preventive Maintenance Checklist

• Change transmission fluid every 60 000 mi or per the manufacturer’s schedule. Fresh fluid keeps the solenoid clean and lubricated.
• Inspect wiring harnesses for wear during regular service intervals, especially in high‑temperature engine bays.
• Use OEM fluid rather than aftermarket blends; the correct viscosity ensures proper hydraulic pressure for the solenoid.
• Run a brief road‑test after any transmission service to verify that the PWM duty cycle responds correctly.

Safe‑to‑Drive Assessment

You can drive short distances (under 10 mi) with P0746, but avoid:

• Towing or hauling heavy loads – extra torque stresses a weak solenoid.
• Steep hills – the transmission may overheat.
• Aggressive shifting – rapid gear changes can exacerbate slipping.

Continuing to drive with a stuck‑off solenoid can overheat the transmission, leading to internal damage that may cost thousands to repair.

Frequently Asked Questions

How do I fix code P0746? Start with a visual inspection, then use a scan tool to verify PWM duty cycle, test voltage and resistance at the solenoid, and replace the solenoid if it fails any test.

How much does it cost to fix P0746? DIY parts range from $80‑$150; a shop repair usually totals $200‑$330, while a dealership may charge $320‑$500.

Why does my transmission slip when P0746 appears? The solenoid controls hydraulic pressure for gear engagement. When it’s stuck off, pressure drops, causing the clutch packs to slip.

How does a Ford solenoid work? In a Ford 6R140, the pressure‑control solenoid receives a PWM signal from the PCM. When the signal is high, the solenoid opens, allowing pressurized fluid to engage the appropriate clutch pack. A stuck‑off condition prevents this pressure buildup.

Is P0746 related to other transmission codes? Yes. Codes like P0740 (Pressure Control Solenoid “A” Performance) and P0750 (Shift Solenoid “A” Performance) often appear together when the valve body suffers from fluid contamination or electrical issues. See also P0740 and P0750. For broader emissions context, review P0420 or P0446.

Tools Checklist

Always disconnect the battery before working on transmission wiring to avoid accidental short circuits. Use jack stands whenever the vehicle is lifted, and keep a fire‑extinguishing blanket nearby when handling hot transmission fluid.

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