AutoCodes – Chevrolet – P1841 2017 Chevrolet Silverado

P1841 2017 Chevrolet Silverado Code - Internal Mode Switch 'S' Circuit High Voltage

Quick Answer

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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: P1841 2017 Chevrolet Silverado indicates Internal Mode Switch 'S' Circuit High Voltage.
Common causes: Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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 199

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 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1841 2017 Chevrolet Silverado Description

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. The internal mode switch consists of 5 separate hall effect switches. Each hall effect switch is supplied with a 9 V reference circuit and a signal circuit from the TCM. Each signal circuit for each gear selector position will have either a voltage reading of 0.70–0.96 V indicating On or 1.68–2.38 V indicating Off. The voltage values on each internal mode switch circuit will change and are dependent on the position of the gear selector. The state of each internal mode switch A/B/C/P/S signal circuit is displayed on the scan tool. The Diagnostic Trouble Code (DTC) will be set when the TCM has detected the internal mode switch S signal circuit voltage is greater than 2.38 V, for 1.75 s.

OBDII Code P1841 2017 Chevrolet Silverado - Internal Mode Switch 'S' Circuit High Voltage - AutoCodes.com — P1841 2017 Chevrolet Silverado Code - Internal Mode Switch 'S' Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1841 2017 Chevrolet Silverado?

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

How to Fix the DTC P1841 2017 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 P1841 2017 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 P1841 2017 Chevrolet Silverado code?

Need more information on how to fix the P1841 2017 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 P1841 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1841 in a 2017 Chevrolet Silverado?

- Common symptoms include issues with shifting gears, difficulty starting the vehicle, and the transmission not engaging properly.

2. What does the Internal Mode Switch 'S' Circuit High Voltage mean in relation to OBDII code P1841?

- This means that the voltage in the internal mode switch circuit is higher than the expected range, indicating a potential electrical issue.

3. What are the possible causes of OBDII code P1841 in a 2017 Chevrolet Silverado?

- Possible causes include a faulty internal mode switch, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or a short circuit.

4. How can I diagnose the Internal Mode Switch 'S' Circuit High Voltage issue in my Chevrolet Silverado?

- Diagnosis involves using a scan tool to read the OBDII code, checking the wiring and connectors for damage, and testing the internal mode switch for proper functioning.

5. Can I still drive my Chevrolet Silverado with OBDII code P1841?

- It is not recommended to continue driving the vehicle with this code as it can lead to further transmission problems and potential safety hazards.

6. How can I repair OBDII code P1841 in my 2017 Chevrolet Silverado?

- Repair steps may include replacing the internal mode switch, repairing or replacing damaged wiring, ensuring proper connections, and clearing the code with a scan tool.

7. Is it necessary to visit a mechanic for OBDII code P1841 or can I fix it myself?

- While some DIY enthusiasts may attempt the repair, it is recommended to consult a qualified mechanic for accurate diagnosis and proper repair of the issue.

8. How much does it typically cost to fix OBDII code P1841 in a Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Are there any preventive maintenance tips to avoid OBDII code P1841 in my Chevrolet Silverado?

- Regularly checking and maintaining the transmission system, ensuring proper electrical connections, and addressing any warning signs promptly can help prevent this issue.

10. Will resetting the OBDII code P1841 on my Chevrolet Silverado make the problem go away?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the Internal Mode Switch 'S' Circuit High Voltage problem.