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Engine-Codes – Generic – P1826

P1826 Code - Internal Mode Switch Circuit 'C' High

Quick Answer

The P1826 diagnostic trouble code (DTC) refers to an issue with the internal mode switch circuit 'C' being detected as high. Common causes include Faulty internal mode switch, Wiring issues or loose connections in the internal mode switch circuit, Corrosion or damage to the internal mode switch circuit. 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 indicates Internal Mode Switch Circuit 'C' High.
Common causes
Common causes include Faulty internal mode switch, Wiring issues or loose connections in the internal mode switch circuit, Corrosion or damage to the internal mode switch circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1826 Description

The P1826 diagnostic trouble code (DTC) refers to an issue with the internal mode switch circuit 'C' being detected as high. The internal mode switch (IMS) is a component within the transmission system that helps the vehicle's onboard computer determine the transmission mode (such as park, reverse, neutral, drive, etc.) selected by the driver. When the internal mode switch circuit 'C' is reported as high, it means that there is an electrical fault or malfunction within this specific circuit.

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

Common Causes of P1826

  1. Faulty internal mode switch.
  2. Wiring issues or loose connections in the internal mode switch circuit.
  3. Corrosion or damage to the internal mode switch circuit.
  4. Issues with the transmission control module (TCM) communication.
  5. Electrical problems within the transmission system.

Symptoms of P1826

  1. Check engine light illuminated on the dashboard.
  2. Transmission slipping or difficulty shifting gears.
  3. Inaccurate gear display on the instrument cluster.
  4. Transmission stuck in one gear.
  5. Vehicle going into "limp mode" to protect the transmission.

How to Fix P1826

  1. Diagnose the internal mode switch circuit 'C' using a scan tool to pinpoint the exact cause of the issue.
  2. Inspect the internal mode switch and wiring connections for any visible damage, corrosion, or loose connections.
  3. Test the internal mode switch for proper operation and replace if necessary.
  4. Repair any wiring issues or connection problems within the circuit.
  5. Clear the DTC with a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1826

The cost of repairing the P1826 code can vary depending on the root cause of the issue and the labor rates in your area. On average, the repair for this code can range from $200 to $500, including parts and labor. Keep in mind that additional diagnostic time may be required to accurately diagnose the problem, and labor rates at auto repair shops can influence the overall cost. It is recommended to get quotes from multiple repair shops to compare prices and ensure you are getting a fair deal.

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Code P1826 Information for Specific Makes

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.

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