P0748 critical

Pressure Control Solenoid Electrical

The P0748 code means the vehicle's onboard diagnostic system has detected: Pressure Control Solenoid Electrical. This is a critical severity code.

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Keep driving?: No -- stop driving
DIY difficulty: hard
Estimated cost: $200 - $800 (parts and labor)

Check Your Fluid First

ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

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Read Transmission Codes

LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

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Common Symptoms

Check Engine Light illuminated
Harsh or erratic shifting
Transmission in limp mode
Delayed gear engagement

Probable Causes (Ranked by Likelihood)

Open or short in pressure control solenoid wiring Very High
Failed pressure control solenoid coil High
Corroded transmission connector pins Moderate
TCM pressure control driver circuit failure Low

Step-by-Step Diagnostic Procedure

Measure pressure control solenoid resistance at the transmission connector
Check for voltage at the solenoid when TCM commands it on
Inspect the transmission harness connector for corrosion or damage
Check wiring continuity from TCM to the solenoid
Replace the solenoid if electrically faulty

Common Fixes by Vehicle

What techs usually find when diagnosing P0748 on specific vehicles — tap your vehicle for the fix and the exact part:

2007-2018 GM Silverado/Tahoe 6L80E Advanced DIY

Pressure control solenoid (PCS) electrical faults on the 6L80E are caused by a shorted solenoid, corroded connector, or damaged wiring at the internal transmission harness. Check the external transmission connector first for pushed-back pins or water intrusion. If the connector is clean, the internal wiring harness or the PCS itself has failed. Solenoid replacement requires valve body removal.

Labor: 3-5 hours

Common fix part GM Transmission Pressure Control Solenoid View on Amazon→ Compare fitment at PartsGeek→

2005-2016 Dodge Ram/Charger 545RFE Advanced DIY

The 545RFE pressure control solenoid is part of the solenoid pack assembly on the valve body. Electrical faults are usually caused by internal solenoid coil failure or chafed wiring inside the transmission. Replace the entire solenoid pack (Mopar 52854002AA) rather than individual solenoids -- the other solenoids are typically near end of life too. Always replace the transmission filter and fluid during the repair.

Labor: 3-5 hours

Common fix part Mopar ATF+4 (6-Quart) View on Amazon→ Compare fitment at PartsGeek→

2005-2017 Ford F-150/Explorer 6R80 Advanced DIY

PCS electrical faults on the 6R80 are often caused by the internal wiring harness rather than the solenoid itself. Ford's updated harness (AL3Z-7G276-A) fixes a known chafing issue where the harness contacts the case. Remove the valve body and inspect the harness routing. If the solenoid resistance is out of spec (11-15 ohms), replace the solenoid. Always refill with Motorcraft Mercon LV.

Labor: 4-6 hours

Common fix part Motorcraft Transmission Solenoid View on Amazon→ Compare fitment at PartsGeek→

Frequently Asked Questions

Can I drive with code P0748?

Do not drive -- have the vehicle towed. Pressure Control Solenoid Electrical can cause severe transmission damage if ignored.

What is the most common fix for P0748?

The most common fix is replacing the affected solenoid. In some cases, a transmission fluid flush and solenoid replacement resolves the issue. Internal torque converter or valve body damage requires more extensive repair.

Can I replace the solenoid myself?

On some vehicles, shift solenoids are accessible by removing the transmission pan. On others, the valve body must be removed. This is a moderate to hard DIY job requiring transmission fluid drainage and careful reassembly.