AutoCodes – GMC – P1775 2014 GMC Sierra

P1775 2014 GMC Sierra 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 2014 GMC Sierra 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 200

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 2014 GMC Sierra 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 2014 GMC Sierra - Transmission Range Request Signal Message Counter Incorrect - AutoCodes.com — P1775 2014 GMC Sierra Code - Transmission Range Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P1775 2014 GMC Sierra?

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 2014 GMC Sierra?

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 2014 GMC Sierra 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 2014 GMC Sierra code?

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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 2014 GMC Sierra Code

1. What does the OBDII code P1775 mean in a 2014 GMC Sierra?

P1775 indicates that the Transmission Range Request Signal Message Counter is incorrect, meaning the powertrain control module (PCM) detected an issue with the signal consistency between the transmission range sensor and related components.

2. What are the symptoms of code P1775 in a 2014 GMC Sierra?

Common symptoms include erratic shifting, the transmission stuck in one gear, the check engine light illuminated, or failure to engage certain gears properly.

3. What causes the P1775 code to appear in a 2014 GMC Sierra?

Possible causes include a faulty transmission range sensor, damaged wiring or connectors in the transmission circuit, a malfunctioning PCM, or software-related issues.

4. Can a faulty transmission range sensor trigger code P1775?

Yes, a faulty or misaligned transmission range sensor is one of the primary causes of this code, as it can send inconsistent or incorrect signals to the PCM.

5. How do I diagnose a P1775 code on my 2014 GMC Sierra?

Start by checking the transmission range sensor and inspecting the wiring and connectors for damage, corrosion, or loose connections. Use a scan tool to monitor live data and verify signal consistency from the sensor to the PCM.

6. Can driving with a P1775 code cause additional damage?

Driving with this code can lead to potential transmission damage if the issue causes improper shifting or the transmission operates outside its normal range.

7. How do you fix the P1775 code on a 2014 GMC Sierra?

Repairs may include replacing a faulty transmission range sensor, repairing or replacing damaged wiring or connectors, or reprogramming/updating the PCM software if necessary.

8. Will clearing the P1775 code fix the issue?

Clearing the code may temporarily remove the check engine light, but if the underlying issue isnâ€™t addressed, the code will likely return after a short period.

9. How much does it cost to fix a P1775 code on a 2014 GMC Sierra?

Repair costs vary depending on the exact cause. Replacing a transmission range sensor typically costs $200â€“$400, while wiring repairs or PCM reprogramming can add to the expense.

10. Can a weak battery cause the P1775 code?

Although less common, a weak or failing battery can sometimes cause communication errors between the PCM and transmission sensors, potentially triggering this code.