AutoCodes – Generic – P0C26

P0C26 Code - Auxiliary Transmission Fluid Pump Motor Current

Quick Answer

The Engine Control Module (ECM) monitors the Auxiliary Transmission Fluid Pump. Common causes include Faulty Auxiliary Transmission Fluid Pump, Auxiliary Transmission Fluid Pump harness is open or shorted, Auxiliary Transmission Fluid Pump 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: P0C26 indicates Auxiliary Transmission Fluid Pump Motor Current.
Common causes: Common causes include Faulty Auxiliary Transmission Fluid Pump, Auxiliary Transmission Fluid Pump harness is open or shorted, Auxiliary Transmission Fluid Pump 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 2,980

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 May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0C26 Description

The Engine Control Module (ECM) monitors the Auxiliary Transmission Fluid Pump. The ECM sets the OBDII code when the Auxiliary Transmission is not to factory specifications.

OBDII Code P0C26 - Auxiliary Transmission Fluid Pump Motor Current - AutoCodes.com — P0C26 Code - Auxiliary Transmission Fluid Pump Motor Current

What does this mean?

What are the Possible Causes of the DTC P0C26?

Faulty Auxiliary Transmission Fluid Pump
Auxiliary Transmission Fluid Pump harness is open or shorted
Auxiliary Transmission Fluid Pump circuit poor electrical connection

How to Fix the DTC P0C26?

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 P0C26 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.

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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 P0C26 Code

1. What does the OBDII code P0C26 mean?

P0C26 indicates an issue with the auxiliary transmission fluid pump motor, specifically that the motor's current is outside the expected range.

2. What are the common symptoms of code P0C26?

Symptoms may include the vehicle entering limp mode, poor transmission performance, overheating of the transmission, or activation of the check engine light.

3. What causes the P0C26 code to appear?

Common causes include a faulty auxiliary transmission fluid pump motor, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or electrical short circuits.

4. Can I drive with the P0C26 code active?

While the vehicle may still be drivable, driving with this code active is not recommended as it can lead to transmission damage due to insufficient fluid circulation.

5. How is the P0C26 code diagnosed?

A technician will use a scan tool to check for additional codes, inspect the wiring and connectors for damage, measure the pump motor's electrical current, and test the operation of the auxiliary transmission fluid pump.

6. How do you fix the P0C26 code?

Repairs may involve replacing the auxiliary transmission fluid pump motor, repairing damaged wiring or connections, or reprogramming or replacing the transmission control module.

7. How much does it cost to fix the P0C26 code?

The repair cost can range from $200 to $800 or more depending on parts and labor, with the auxiliary transmission fluid pump motor being a significant expense.

8. Can a weak battery cause the P0C26 code?

Yes, a weak or failing battery or alternator can result in insufficient power to the auxiliary transmission fluid pump, triggering the code.

9. What tools are needed to diagnose the P0C26 code?

Common tools include an OBDII scan tool, a digital multimeter to check electrical circuits, and possibly a specialized tool to test the transmission fluid pump.

10. Is the P0C26 code specific to hybrid or electric vehicles?

Yes, this code is more commonly found in hybrid or electric vehicles that use an auxiliary transmission fluid pump to maintain proper fluid circulation.