AutoCodes – Cadillac – P1751 Cadillac

P1751 Cadillac 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 Cadillac 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 1,143

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 Cadillac 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 Cadillac - Shift Valve 1 Performance - AutoCodes.com — P1751 Cadillac Code - Shift Valve 1 Performance

What does this mean?

What are the Possible Causes of the DTC P1751 Cadillac?

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 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1751 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 P1751 Cadillac Code

1. What does the OBDII code P1751 mean on a Cadillac?

P1751 indicates a "Shift Valve 1 Performance" issue, meaning the transmission control module (TCM) has detected a problem with the performance of the shift valve 1 in the automatic transmission.

2. What are the common symptoms of the P1751 code on a Cadillac?

Symptoms may include harsh or delayed shifting, transmission slipping, reduced fuel efficiency, or the vehicle entering "limp mode." The check engine light or transmission warning light may also illuminate.

3. What causes the P1751 code to appear on a Cadillac?

Common causes include a faulty shift solenoid, dirty or low transmission fluid, a malfunctioning transmission control module (TCM), or internal transmission damage.

4. Can low transmission fluid cause the P1751 code?

Yes, low or dirty transmission fluid can cause the shift valve to perform poorly, triggering the P1751 code.

5. How is the P1751 code diagnosed on a Cadillac?

A mechanic will use a scan tool to read the code, check transmission fluid levels and condition, inspect the wiring and connectors, and possibly test the shift solenoid and TCM.

6. Can you drive a Cadillac with the P1751 code active?

Itâ€™s not recommended to drive with the P1751 code active, as it may cause further damage to the transmission or result in unsafe driving conditions.

7. How do you fix the P1751 code on a Cadillac?

Repairs may include replacing the shift solenoid, flushing and refilling the transmission fluid, repairing wiring connections, or reprogramming or replacing the TCM.

8. How much does it cost to repair the P1751 code on a Cadillac?

Repair costs can vary, but replacing a shift solenoid typically costs $200â€“$400, while a full transmission repair or replacement may exceed $1,000.

9. Can a faulty TCM cause the P1751 code?

Yes, a malfunctioning transmission control module (TCM) can misinterpret data or fail to control the shift valve properly, triggering the P1751 code.

10. Is resetting the code enough to fix the P1751 issue?

Resetting the code without addressing the underlying problem may only temporarily clear the warning, as the issue is likely to return unless repaired.