AutoCodes – Generic – U1261

U1261 Code - Single Ended Negative Circuit Failure

Quick Answer

The Diagnostic Trouble Code (DTC) sets when Single Ended Negative Circuit Failure has detected. Common causes include Check for other codes, Faulty Powertrain Control Module (PCM). 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: U1261 indicates Single Ended Negative Circuit Failure.
Common causes: Common causes include Check for other codes, Faulty Powertrain Control Module (PCM).
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 15,099

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 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1261 Description

The Diagnostic Trouble Code (DTC) sets when Single Ended Negative Circuit Failure has detected.

OBDII Code U1261 - Single Ended Negative Circuit Failure - AutoCodes.com — U1261 Code - Single Ended Negative Circuit Failure

What does this mean?

What are the Possible Causes of the DTC U1261?

Check for other codes
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U1261?

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 U1261 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 U1261 code?

Need more information on how to fix the U1261 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1261 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 U1261 Code

1. What are the common symptoms of OBDII code U1261 (Single Ended Negative Circuit Failure)?

- Common symptoms include intermittent or persistent illumination of the Check Engine Light (CEL), issues with vehicle starting, and potential transmission performance problems.

2. What are the possible causes of OBDII code U1261?

- Possible causes of U1261 can include faulty wiring connections, damaged circuits, issues with the transmission control module (TCM), or a malfunctioning powertrain control module (PCM).

3. How can I diagnose OBDII code U1261?

- Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, checking the wiring and connections for any damage, and testing the TCM and PCM for proper functionality.

4. Can OBDII code U1261 be fixed at home?

- Depending on the specific cause, fixing U1261 at home may be possible if you have the necessary tools and expertise to diagnose and repair electrical issues. However, seeking professional help is recommended for complex problems.

5. What are some repair tips for addressing OBDII code U1261?

- Repair tips include inspecting and repairing any damaged wiring, ensuring proper connections, checking and resetting the TCM and PCM, and clearing the trouble codes to see if the issue recurs.

6. Is it safe to continue driving with OBDII code U1261 present?

- It is not recommended to continue driving with U1261 present, as the underlying electrical issues could potentially lead to more serious problems with the vehicle's transmission or overall performance.

7. How much does it typically cost to repair OBDII code U1261 at a professional auto repair shop?

- Repair costs for U1261 can vary depending on the specific cause of the issue, but they may range from $100 to $500 or more, including diagnostic fees and parts and labor costs.

8. Can resetting the trouble codes clear OBDII code U1261 permanently?

- Resetting the trouble codes may temporarily clear U1261, but if the underlying issue is not addressed and fixed, the code is likely to reappear once the vehicle is driven again.

9. Does OBDII code U1261 affect the vehicle's fuel efficiency?

- While U1261 itself may not directly impact fuel efficiency, unresolved electrical issues related to the code could potentially lead to performance problems that may affect fuel efficiency over time.

10. How can I prevent OBDII code U1261 from recurring in the future?

- To prevent U1261 from recurring, it is essential to address and repair any underlying electrical issues promptly, perform regular vehicle maintenance checks, and follow recommended service schedules for your vehicle.