AutoCodes – Chevrolet – P1841 2015 Chevrolet Silverado

P1841 2015 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 2015 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 211

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 2015 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 2015 Chevrolet Silverado - Internal Mode Switch 'S' Circuit High Voltage - AutoCodes.com — P1841 2015 Chevrolet Silverado Code - Internal Mode Switch 'S' Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1841 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P1841 2015 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 2015 Chevrolet Silverado Code

1. What does the OBDII code P1841 mean on a 2015 Chevrolet Silverado?

P1841 indicates an issue with the Internal Mode Switch (IMS) 'S' circuit, specifically detecting high voltage, which suggests a possible wiring or sensor fault in the transmission system.

2. What are the common symptoms of code P1841 in a 2015 Chevrolet Silverado?

Common symptoms include erratic shifting, transmission staying in one gear, illuminated check engine light, and potential limp mode activation.

3. What causes P1841 to trigger in a 2015 Chevrolet Silverado?

The code can be caused by a faulty Internal Mode Switch, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or electrical short circuits.

4. Can I drive my 2015 Chevrolet Silverado with a P1841 code?

Driving with this code is not recommended as it can lead to further transmission damage or unsafe driving conditions due to improper gear shifting.

5. How do I diagnose the P1841 code on my Silverado?

Start by checking the IMS wiring and connectors for damage or corrosion, test the IMS for proper operation, and use a scan tool to monitor voltage readings on the 'S' circuit.

6. How do I fix the P1841 code on a 2015 Chevrolet Silverado?

Repairs may include replacing the Internal Mode Switch, repairing or replacing damaged wiring, or reprogramming or replacing the TCM if necessary.

7. How much does it cost to fix a P1841 code on a Silverado?

The repair cost varies depending on the issue, ranging from $50 for wiring repairs to $500+ for a new Internal Mode Switch or TCM.

8. Can a low battery cause the P1841 code on my Silverado?

While unlikely, low battery voltage or charging system issues can sometimes cause electrical faults and should be ruled out during diagnosis.

9. What tools are needed to diagnose the P1841 code?

You will need a scan tool capable of reading transmission codes, a multimeter for testing voltage and continuity, and possibly a wiring diagram for troubleshooting.

10. Does clearing the P1841 code solve the problem?

Simply clearing the code will not fix the underlying issue. Proper diagnosis and repair are necessary to prevent the code from returning.