AutoCodes – Chevrolet – C1277 Chevrolet

C1277 Chevrolet Code - Requested Torque Signal Circuit Malfunction

Quick Answer

The Electronic Brake Control Module (EBCM) and the Powertrain Control Module (PCM) simultaneously control the traction control. Common causes include Faulty Electronic Brake Control Module (EBCM), Faulty Powertrain Control Module (PCM), EBCM harness is open or shorted. 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 Chevrolet indicates Requested Torque Signal Circuit Malfunction.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Faulty Powertrain Control Module (PCM), EBCM harness is open or shorted.
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 8,695

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 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1277 Chevrolet Description

The Electronic Brake Control Module (EBCM) and the Powertrain Control Module (PCM) simultaneously control the traction control. The EBCM sends a Requested Torque message via a pulse width modulated (PWM) signal to the PCM. The duty cycle of the signal is used to determine how much engine torque the EBCM is requesting the PCM to deliver. Normal values are between 10 and 90 percent duty cycle. The signal should be at 90 percent when traction control is not active and at lower values during traction control activations. The PCM supplies the pull up voltage that the EBCM switches to ground to create the signal.

OBDII Code C1277 Chevrolet - Requested Torque Signal Circuit Malfunction - AutoCodes.com — C1277 Chevrolet Code - Requested Torque Signal Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC C1277 Chevrolet?

Faulty Electronic Brake Control Module (EBCM)
Faulty Powertrain Control Module (PCM)
EBCM harness is open or shorted
EBCM circuit poor electrical connection

How to Fix the DTC C1277 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 C1277 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.

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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 C1277 Chevrolet Code

1. What are the common symptoms of OBDII code C1277 in a Chevrolet vehicle?

The common symptoms of OBDII code C1277 in a Chevrolet include issues with the vehicle's stability control system, traction control system, and potential illumination of the ABS warning light.

2. What can cause the OBDII code C1277 in a Chevrolet to appear?

The OBDII code C1277 in a Chevrolet is typically caused by a malfunction in the Requested Torque Signal Circuit, which can be due to damaged wiring, faulty sensors, or issues with the ABS module.

3. How can I diagnose the OBDII code C1277 in my Chevrolet?

Diagnosing the OBDII code C1277 in a Chevrolet involves using a scan tool to retrieve the trouble codes, inspecting the wiring and connectors for any damage, and testing the sensors and ABS module for proper functionality.

4. Can I still drive my Chevrolet with the OBDII code C1277 present?

While it may be possible to drive your Chevrolet with the OBDII code C1277 present, it is not recommended as it can affect the vehicle's stability control and traction control systems, potentially compromising safety.

5. How can I repair the OBDII code C1277 in my Chevrolet?

Repairing the OBDII code C1277 in a Chevrolet involves identifying and fixing the underlying issue causing the Requested Torque Signal Circuit malfunction, which may require repairing or replacing damaged wiring, sensors, or the ABS module.

6. Is it possible to reset the OBDII code C1277 in a Chevrolet without fixing the issue?

Resetting the OBDII code C1277 in a Chevrolet without fixing the underlying issue will only temporarily clear the code, and it is likely to reappear once the problem persists.

7. Can a DIY enthusiast fix the OBDII code C1277 in a Chevrolet?

While some DIY enthusiasts may be able to diagnose and repair the OBDII code C1277 in a Chevrolet, it is recommended to have the issue addressed by a professional mechanic with experience in ABS system repairs.

8. How much does it cost to repair the OBDII code C1277 in a Chevrolet?

The cost of repairing the OBDII code C1277 in a Chevrolet can vary depending on the underlying issue, the extent of the damage, and the labor rates of the repair shop. It is advisable to obtain quotes from multiple mechanics for an accurate estimate.

9. Will ignoring the OBDII code C1277 in my Chevrolet cause further damage?

Ignoring the OBDII code C1277 in a Chevrolet can lead to potential safety hazards, as it affects the vehicle's stability control and traction control systems. It is recommended to address the issue promptly to avoid further damage.

10. How long does it take to repair the OBDII code C1277 in a Chevrolet?

The time required to repair the OBDII code C1277 in a Chevrolet can vary depending on the specific cause of the issue and the availability of parts. In some cases, the repair can be completed in a few hours, while more complex issues may take longer to resolve.