AutoCodes – GMC – P17DD 2018 GMC Sierra

P17DD 2018 GMC Sierra Code - Transmission Range Control Module System Voltage Low

Quick Answer

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Faulty Transmission Range Control Module, Transmission Range Control Module harness is open or shorted, Transmission Range 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: P17DD 2018 GMC Sierra indicates Transmission Range Control Module System Voltage Low.
Common causes: Common causes include Faulty Transmission Range Control Module, Transmission Range Control Module harness is open or shorted, Transmission Range 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 340

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 Jul 04, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P17DD 2018 GMC Sierra Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. The Diagnostic Trouble Code (DTC) will be set when the Transmission Range Control Module detects a system voltage below or above a threshold.

OBDII Code P17DD 2018 GMC Sierra - Transmission Range Control Module System Voltage Low - AutoCodes.com — P17DD 2018 GMC Sierra Code - Transmission Range Control Module System Voltage Low

What does this mean?

What are the Possible Causes of the DTC P17DD 2018 GMC Sierra?

Faulty Transmission Range Control Module
Transmission Range Control Module harness is open or shorted
Transmission Range Control Module circuit poor electrical connection

How to Fix the DTC P17DD 2018 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 P17DD 2018 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 P17DD 2018 GMC Sierra code?

Need more information on how to fix the P17DD 2018 GMC Sierra 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 P17DD 2018 GMC Sierra Code

1. What does the OBDII code P17DD mean on a 2018 GMC Sierra?

P17DD indicates "Transmission Range Control Module System Voltage Low," meaning the voltage supplied to the transmission range control module is below the expected range.

2. What are the common symptoms of code P17DD on a 2018 GMC Sierra?

Symptoms may include harsh or delayed shifting, transmission stuck in one gear, illuminated check engine light, and reduced vehicle performance.

3. What causes the P17DD code to appear on a 2018 GMC Sierra?

Common causes include a weak or failing battery, corroded or loose electrical connections, a faulty transmission range control module, or issues with the vehicle's charging system.

4. Can a low battery voltage trigger the P17DD code?

Yes, a low or failing battery can cause insufficient voltage to the transmission range control module, leading to the P17DD code.

5. How can I diagnose the P17DD code on my 2018 GMC Sierra?

Start by checking the battery voltage and charging system, inspecting wiring and connectors for damage or corrosion, and testing the transmission range control module for proper operation.

6. Is it safe to drive with the P17DD code on a 2018 GMC Sierra?

Driving with the P17DD code may not be safe, as it can cause shifting issues or potential transmission damage. It's best to address the issue promptly.

7. How do I fix the P17DD code on my 2018 GMC Sierra?

Repair steps may include charging or replacing the battery, cleaning or repairing corroded wiring, securing loose connections, or replacing a faulty transmission range control module.

8. Does the P17DD code always mean the transmission range control module is bad?

No, the P17DD code can also be caused by low system voltage due to a weak battery, alternator issues, or damaged wiring.

9. Can an alternator problem cause the P17DD code on a 2018 GMC Sierra?

Yes, a failing alternator can result in low voltage to the transmission range control module, triggering the P17DD code.

10. Do I need special tools to fix the P17DD code on my 2018 GMC Sierra?

You may need a multimeter to check voltage, an OBDII scanner to clear the code, and possibly specialized equipment for testing the transmission range control module.