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P0904

P0904: Transmission Advanced System - Pressure Control Solenoid 'A' Circuit Low

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

Moderate

1-2 hours

DIY Possible?

❌ No

Pro recommended

📖 What Does P0904 Mean?

The transmission control module (TCM) has detected a low voltage signal from the pressure control solenoid 'A' circuit, which may indicate a problem with the solenoid, wiring, or TCM.

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Symptoms

• Transmission slipping
• hesitation
• or refusal to engage gears
• unusual noises
• or illuminated check engine light.

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Common Causes

• Faulty pressure control solenoid 'A'
• wiring issues
• TCM malfunction
• or low transmission fluid level.

Fix Guide

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Possible Solutions

1. Check transmission fluid level and top off as needed. 2. Inspect and clean or replace the pressure control solenoid 'A' circuit wiring. 3. Test the solenoid with a multimeter to ensure proper voltage and resistance. 4. Update the TCM software if necessary. 5. Replace the pressure control solenoid 'A' if faulty.

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❓ Common Questions About P0904

Can I drive with code P0904?

You can drive for a short time, but should address code P0904 soon to avoid worsening the problem or failing an emissions test.

How much does it cost to fix P0904?

The estimated repair cost for code P0904 is between $100 and $500. This includes parts and labor for most makes and models.

Is this code easy to fix myself?

This repair is considered moderate. It may require specialized tools or significant disassembly. Professional help is recommended if you aren't an experienced DIYer.