Engine-Codes.com
Engine-Codes – Buick – C1277 Buick

C1277 Buick Code - Requested Torque Signal Circuit Malfunction

Quick Answer

The C1277 diagnostic trouble code (DTC) indicates a malfunction in the requested torque signal circuit within a Buick vehicle. Common causes include Faulty Torque Sensor: A malfunctioning torque sensor can fail to send the correct signal to the ECM/TCM, Wiring Issues: Damaged or corroded wiring in the torque signal circuit can disrupt communication between components, Control Module Failure: The ECM or TCM may have internal faults that prevent them from processing the torque signal correctly. 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
C1277 Buick indicates Requested Torque Signal Circuit Malfunction.
Common causes
Common causes include Faulty Torque Sensor: A malfunctioning torque sensor can fail to send the correct signal to the ECM/TCM, Wiring Issues: Damaged or corroded wiring in the torque signal circuit can disrupt communication between components, Control Module Failure: The ECM or TCM may have internal faults that prevent them from processing the torque signal correctly.
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 Oct 04, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code C1277 Buick Description

The C1277 diagnostic trouble code (DTC) indicates a malfunction in the requested torque signal circuit within a Buick vehicle. This code is primarily associated with the vehicle's electronic control systems, particularly those governing the powertrain and stability control functions. The requested torque signal is crucial for the vehicle's engine control module (ECM) and transmission control module (TCM) to determine the appropriate amount of power to deliver to the wheels, ensuring optimal performance and safety.

OBDII Code C1277 Buick - Requested Torque Signal Circuit Malfunction
C1277 Buick Code - Requested Torque Signal Circuit Malfunction

Common Causes of C1277 Buick

  1. Faulty Torque Sensor: A malfunctioning torque sensor can fail to send the correct signal to the ECM/TCM.
  2. Wiring Issues: Damaged or corroded wiring in the torque signal circuit can disrupt communication between components.
  3. Control Module Failure: The ECM or TCM may have internal faults that prevent them from processing the torque signal correctly.
  4. Software Glitches: Outdated or corrupted software in the control modules can lead to erroneous readings and signal failures.
  5. Mechanical Issues: Problems with the throttle body or other engine components can affect the torque request signal.

Symptoms of C1277 Buick

  1. Reduced Engine Power: The vehicle may exhibit a noticeable decrease in acceleration and overall power output.
  2. Erratic Transmission Shifting: Shifts may become harsh or unpredictable, leading to a less smooth driving experience.
  3. Traction Control Malfunction: The traction control system may become disabled, increasing the risk of wheel spin in slippery conditions.
  4. Check Engine Light Activation: The vehicle's onboard diagnostics will trigger the check engine light, indicating a fault in the system.
  5. Limp Mode Activation: The vehicle may enter a protective mode, limiting engine performance to prevent damage.

How to Fix C1277 Buick

  1. Diagnostic Scan: Begin with a comprehensive diagnostic scan to confirm the C1277 code and check for any related codes that may provide additional context.
  2. Visual Inspection: Inspect the wiring and connectors associated with the torque signal circuit for signs of damage, corrosion, or loose connections.
  3. Sensor Testing: Test the torque sensor for proper operation using a multimeter or diagnostic tool to ensure it is sending accurate signals.
  4. Control Module Reprogramming: If software issues are suspected, reprogram or update the ECM/TCM software to the latest version.
  5. Replace Faulty Components: If any components (sensors, wiring, or control modules) are found to be defective, replace them with OEM or high-quality aftermarket parts.

Cost to Fix C1277 Buick

The repair costs for addressing the C1277 code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $200 and $800, which includes parts and labor. Labor rates typically range from $80 to $150 per hour, depending on the location and type of repair shop. Metropolitan areas or dealerships may charge higher rates, while independent shops often offer competitive pricing. It's advisable to obtain quotes from local repair shops to get a more accurate estimate tailored to your vehicle's needs.

When is the Code Detected?

The Powertrain Control Module (PCM) does not receive the desired pulse width signal from the Electronic Brake Control Module (EBCM)

Need more information about the C1277 Buick code?

Need more information on how to fix the C1277 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1277 Buick 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 C1277 Buick Code

1. What does the OBDII code C1277 mean on a Buick?

C1277 indicates a malfunction in the requested torque signal circuit, which is a communication issue between the engine control module (ECM) and the electronic brake control module (EBCM).

2. What are the common symptoms of code C1277 in a Buick?

Common symptoms include the ABS or traction control warning lights illuminating, reduced engine power, and compromised traction or stability control functionality.

3. What causes the C1277 code in a Buick?

The code can be caused by damaged wiring or connectors in the torque signal circuit, a faulty ECM or EBCM, or software issues in the vehicle’s control modules.

4. Can I drive my Buick with the C1277 code?

While the car may still be drivable, safety features like ABS and traction control may not function properly, increasing the risk of losing control in adverse driving conditions.

5. How do I diagnose the C1277 code on my Buick?

Diagnosis involves scanning for additional codes, inspecting the wiring and connectors in the torque signal circuit, and testing the ECM and EBCM for proper communication.

6. What tools are required to troubleshoot the C1277 code?

You’ll need an OBDII scanner, a multimeter to test electrical connections, and potentially a wiring diagram specific to your Buick model.

7. How can I fix the C1277 code on my Buick?

Repairs may include fixing damaged wiring, replacing faulty connectors, reprogramming or updating the ECM/EBCM software, or replacing a defective control module.

8. How much does it cost to repair the C1277 code on a Buick?

Repair costs can range from $100 to $1,000 depending on whether the issue is a simple wiring fix or requires replacing a control module.

9. Can a dead battery cause the C1277 code in a Buick?

A weak or dead battery can cause voltage drops that may trigger communication errors between control modules, potentially leading to the C1277 code.

10. Do I need to clear the C1277 code after repairs?

Yes, after completing repairs, use an OBDII scanner to clear the code and test drive the vehicle to ensure the issue is resolved.

Discuss the causes and fixes for C1277 Buick OBDII Code

Submit a New Comment

Code C1277 Buick comments

No comments found for this page.