C1277 Buick 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 Buick 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.
Code C1277 Buick Description
What are the Possible Causes of the DTC C1277 Buick?
- 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 Buick?
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 Buick 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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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.
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