AutoCodes – Cadillac – P0751 Cadillac

P0751 Cadillac Code - Shift Solenoid Valve 1 Performance Stuck Off

Quick Answer

The shift solenoid 1 is part of the control solenoid valve assembly which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0751 Cadillac indicates Shift Solenoid Valve 1 Performance Stuck Off.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 16,144

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0751 Cadillac Description

The shift solenoid 1 is part of the control solenoid valve assembly which has no serviceable parts. The control solenoid valve assembly is attached to the lower control valve body. The solenoid operates by the Transmission Control Module opening or closing the ground circuit. With the solenoid circuit grounded (solenoid on), the internal plunger and metering ball block the exhaust fluid creating signal fluid pressure. The signal fluid acts against the clutch select valve 2 to overcome the valve spring force moving it to the apply position, allowing the shift. The shift solenoid 1 is commanded ON in Park, Reverse, Neutral, and Drive 1 Engine Braking, and commanded OFF in Drive 1–6 gear ranges. The Diagnostic Trouble Code (DTC) will be set when the gear slip is greater than 400 RPM for 2 s.

OBDII Code P0751 Cadillac - Shift Solenoid Valve 1 Performance Stuck Off - AutoCodes.com — P0751 Cadillac Code - Shift Solenoid Valve 1 Performance Stuck Off

What does this mean?

What are the Possible Causes of the DTC P0751 Cadillac?

Low transmission fluid level
Dirty transmission fluid
Faulty Control Solenoid Valve Assembly
Control Solenoid Valve Assembly harness or connectors
Control Solenoid Valve Assembly circuit is open or shorted

How to Fix the DTC P0751 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

When a transmission solenoid is stuck off, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommended to change the transmission fluid and if possible, remove the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure, and that the transmission will need to be rebuilt or replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0751 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0751 Cadillac Code

What does the OBDII code P0751 mean for a Cadillac?

The code P0751 indicates a problem with Shift Solenoid Valve 1, specifically its performance or that it is stuck in the "off" position, affecting transmission shift timing.

What are common symptoms of code P0751 on a Cadillac?

Symptoms may include harsh or delayed gear shifting, transmission slipping, poor fuel economy, and the Check Engine Light turning on.

What causes the P0751 code on a Cadillac?

Possible causes include a malfunctioning shift solenoid, contaminated transmission fluid, wiring or connector issues, or internal transmission problems.

Can driving with the P0751 code damage the transmission?

Yes, driving with this code for an extended period can cause further damage to the transmission due to improper shifting and added strain.

How is the P0751 code diagnosed on a Cadillac?

A mechanic typically uses a scan tool to read the code, checks the transmission fluid condition, inspects wiring and connectors, and performs solenoid functionality tests.

What repairs are commonly needed for code P0751?

Repairs may include replacing the shift solenoid, cleaning or replacing transmission fluid, repairing damaged wiring, or addressing internal transmission issues.

Can low transmission fluid trigger the P0751 code?

Yes, low or dirty transmission fluid can restrict solenoid operation and lead to this code.

How much does it cost to fix the P0751 code on a Cadillac?

Repair costs can range from $150 to $500 or more, depending on whether the shift solenoid, wiring, or transmission needs attention.

Is it safe to drive a Cadillac with the P0751 code?

Driving with this code is not recommended, as it can lead to worsening transmission problems and unsafe driving conditions.

How do you prevent the P0751 code from occurring?

Regular maintenance, including timely transmission fluid changes and inspections, can help prevent issues with shift solenoids and related components.