AutoCodes – Chevrolet – P1826 Chevrolet

P1826 Chevrolet Code - Internal Mode Switch Circuit 'C' High

Quick Answer

With the engine speed at least 500 rpm for 5 seconds, Fuel Shutoff inactive, engine torque more than 20 ft-Ibs, the Powertrain Control Module (PCM) detects that the Internal Mode Switch (IMS) 'C' signal was in a high state while the gear ratio indicated 1st, 2nd or 3rd gear, condition met for 0.5 seconds. Common causes include Faulty Internal Mode Switch, Internal Mode Switch harness is open or shorted, 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: P1826 Chevrolet indicates Internal Mode Switch Circuit 'C' High.
Common causes: Common causes include Faulty Internal Mode Switch, Internal Mode Switch harness is open or shorted, 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 3,855

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 21, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1826 Chevrolet Description

OBDII Code P1826 Chevrolet - Internal Mode Switch Circuit 'C' High - AutoCodes.com — P1826 Chevrolet Code - Internal Mode Switch Circuit 'C' High

What does this mean?

What are the Possible Causes of the DTC P1826 Chevrolet?

Faulty Internal Mode Switch
Internal Mode Switch harness is open or shorted
Internal Mode Switch circuit poor electrical connection

How to Fix the DTC P1826 Chevrolet?

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 P1826 Chevrolet 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 P1826 Chevrolet code?

Need more information on how to fix the P1826 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1826 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 P1826 Chevrolet Code

1. What are the common symptoms of OBDII code P1826 in a Chevrolet vehicle?

- Common symptoms include difficulty shifting gears, illumination of the Check Engine light, and potential issues with transmission performance.

2. What does the OBDII code P1826 'Internal Mode Switch Circuit 'C' High' indicate in a Chevrolet?

- This code indicates a problem with the internal mode switch circuit 'C', which is responsible for providing input to the transmission control module.

3. What are the possible causes of OBDII code P1826 in a Chevrolet related to the internal mode switch circuit 'C'?

- Possible causes include a faulty internal mode switch, damaged wiring or connectors in the circuit, or issues with the transmission control module.

4. How can I diagnose the OBDII code P1826 in my Chevrolet related to the internal mode switch circuit 'C'?

- Diagnosing this code may involve checking the internal mode switch for proper operation, inspecting the circuit wiring and connectors for damage, and testing the transmission control module.

5. What are some repair tips for resolving OBDII code P1826 in a Chevrolet?

- Repair tips may include replacing the internal mode switch if faulty, repairing or replacing damaged wiring or connectors, and reprogramming the transmission control module if necessary.

6. Can I drive my Chevrolet with the OBDII code P1826 present?

- It is not recommended to drive the vehicle with this code, as it can lead to transmission issues and potentially cause further damage if left unaddressed.

7. How much does it typically cost to repair OBDII code P1826 in a Chevrolet?

- The cost of repair can vary depending on the specific cause of the code, but it may involve parts replacement and labor costs, which can range from a few hundred to over a thousand dollars.

8. Is it possible to reset the OBDII code P1826 in a Chevrolet without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it is important to address the root cause of the problem to prevent it from recurring and potentially causing further issues.

9. Will OBDII code P1826 in a Chevrolet cause the vehicle to fail an emissions test?

- Yes, this code can cause the vehicle to fail an emissions test due to its impact on transmission performance and emissions control systems.

10. How can I prevent OBDII code P1826 from occurring in my Chevrolet in the future?

- Regular maintenance, such as checking and servicing the transmission components, inspecting wiring harnesses for damage, and addressing any issues promptly, can help prevent this code from reoccurring.