AutoCodes – Chevrolet – P1775 2018 Chevrolet Silverado

P1775 2018 Chevrolet Silverado Code - Transmission Range Request Signal Message Counter Incorrect

Quick Answer

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module 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: P1775 2018 Chevrolet Silverado indicates Transmission Range Request Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module 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 284

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1775 2018 Chevrolet Silverado Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Transmission Range Request Signal Message Counter is Incorrect.

OBDII Code P1775 2018 Chevrolet Silverado - Transmission Range Request Signal Message Counter Incorrect - AutoCodes.com — P1775 2018 Chevrolet Silverado Code - Transmission Range Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P1775 2018 Chevrolet Silverado?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC P1775 2018 Chevrolet Silverado?

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 P1775 2018 Chevrolet Silverado 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.

Need more information about the P1775 2018 Chevrolet Silverado code?

Need more information on how to fix the P1775 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P1775 2018 Chevrolet Silverado Code

1. What does the OBDII code P1775 mean on a 2018 Chevrolet Silverado?

P1775 indicates that the Transmission Range Request Signal Message Counter is incorrect, typically signaling an issue with the communication between the transmission control module (TCM) and other systems.

2. What are common symptoms of code P1775 in a 2018 Chevrolet Silverado?

Symptoms may include erratic shifting, transmission stuck in one gear, failure to engage certain gears, or the check engine light illuminating.

3. What causes the P1775 code to appear on a 2018 Chevrolet Silverado?

Possible causes include faulty wiring or connectors, a malfunctioning transmission control module (TCM), or corrupted communication signals between the TCM and PCM.

4. Can driving with code P1775 damage the transmission in a 2018 Chevrolet Silverado?

Driving with this code may lead to further transmission issues if not addressed, especially if erratic shifting or gear engagement problems occur.

5. How is the P1775 code diagnosed on a 2018 Chevrolet Silverado?

Technicians typically use a diagnostic scanner to check for related codes, inspect wiring and connectors, and test communication signals between the TCM and other modules.

6. What repairs can fix the P1775 code on a 2018 Chevrolet Silverado?

Repairs may include fixing or replacing damaged wiring or connectors, reprogramming the TCM, or replacing the TCM if it's defective.

7. Can a software update resolve code P1775 in a 2018 Chevrolet Silverado?

Yes, a TCM or PCM software update may resolve the issue if the problem stems from corrupted communication protocols.

8. How much does it cost to repair code P1775 on a 2018 Chevrolet Silverado?

Repair costs vary, but minor wiring repairs may cost under $200, while TCM replacement can exceed $1,000 depending on labor and parts.

9. Is code P1775 specific to Chevrolet Silverado trucks?

No, P1775 can appear on other vehicles equipped with similar transmission systems, but the specifics of diagnosis and repair may vary by make and model.

10. Can I clear the P1775 code without addressing the issue on a 2018 Chevrolet Silverado?

Clearing the code without fixing the underlying issue may temporarily remove the check engine light, but the code will likely return and may worsen transmission performance.