AutoCodes – GMC – P1751 GMC

P1751 GMC Code - Shift Valve 1 Performance

Quick Answer

The Shift Solenoid (SS) 1 is part of the Control Solenoid Valve Assembly, which has no serviceable parts. Common causes include Faulty Control Solenoid Valve Assembly, Control Solenoid Valve Assembly harness is open or shorted, Control Solenoid Valve Assembly circuit poor electrical connection. 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: P1751 GMC indicates Shift Valve 1 Performance.
Common causes: Common causes include Faulty Control Solenoid Valve Assembly, Control Solenoid Valve Assembly harness is open or shorted, Control Solenoid Valve Assembly circuit poor electrical connection.
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 1,791

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 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1751 GMC Description

The Shift Solenoid (SS) 1 is part of the Control Solenoid Valve Assembly, which has no serviceable parts. SS 1 provides fluid pressure to control the operation of the clutch select valve 2, which is located in the control valve lower body assembly. SS 1, in conjunction with clutch select valve 2, controls fluid to the R1 and 4-5-6 clutches. A diagnostic test is performed by the Transmission Control Module (TCM) to determine the state of the clutch select valve 2. During this diagnostic test, the TCM commands the SS 1 ON, supplying pressure to move the clutch select valve 2 toward its spring. At the same time, line pressure is elevated slightly to assist the spring side pressure. If the spring is broken, or the clutch select valve 2 cannot move due to another mechanical condition the Diagnostic Trouble Code (DTC) will set.

OBDII Code P1751 GMC - Shift Valve 1 Performance - AutoCodes.com — P1751 GMC Code - Shift Valve 1 Performance

What does this mean?

What are the Possible Causes of the DTC P1751 GMC?

Faulty Control Solenoid Valve Assembly
Control Solenoid Valve Assembly harness is open or shorted
Control Solenoid Valve Assembly circuit poor electrical connection

How to Fix the DTC P1751 GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1751 GMC 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 P1751 GMC Code

1. What are the common symptoms of OBDII code P1751 in a GMC related to Shift Valve 1 Performance?

Symptoms may include harsh shifting, transmission slipping, delayed engagement, and illuminated Check Engine Light.

2. What are the possible causes of OBDII code P1751 Shift Valve 1 Performance in a GMC?

Potential causes include a faulty shift solenoid, low transmission fluid levels, a defective transmission control module, or internal transmission issues.

3. How can I diagnose OBDII code P1751 in a GMC related to Shift Valve 1 Performance?

Diagnosis typically involves checking the transmission fluid level and condition, performing a visual inspection for any visible damage, and using a scan tool to monitor transmission data and codes.

4. Can I continue driving my GMC with OBDII code P1751 Shift Valve 1 Performance?

It is not recommended to continue driving the vehicle with this code as it may lead to further damage to the transmission. It is best to address the issue promptly.

5. How can I repair OBDII code P1751 Shift Valve 1 Performance in a GMC?

Repair options may include replacing the faulty shift solenoid, addressing low transmission fluid levels, repairing or replacing the transmission control module, or seeking professional help for internal transmission repairs.

6. Are there any DIY tips for fixing OBDII code P1751 in a GMC related to Shift Valve 1 Performance?

DIY tips may include checking and topping up transmission fluid levels, inspecting electrical connections for corrosion, and ensuring the shift solenoid is receiving proper voltage.

7. Can a simple reset of the OBDII system clear the P1751 code in a GMC?

While resetting the OBDII system may temporarily clear the code, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. What is the role of Shift Valve 1 in the transmission system of a GMC with OBDII code P1751?

Shift Valve 1 is responsible for regulating hydraulic pressure to control gear shifting in the transmission. A performance issue with this valve can lead to transmission operation problems.

9. How much does it typically cost to repair OBDII code P1751 Shift Valve 1 Performance in a GMC?

The cost of repair can vary depending on the specific issue causing the code and the labor rates of the repair shop. It is advisable to obtain quotes from multiple sources for an accurate estimate.

10. Is it necessary to visit a dealership for repairs related to OBDII code P1751 in a GMC?

While dealerships have specialized knowledge and equipment, reputable independent repair shops and transmission specialists can also effectively diagnose and repair issues related to OBDII code P1751 in a GMC.