AutoCodes – GMC – C1275 GMC

C1275 GMC Code - PCM Serial Data Malfunction

Quick Answer

The Powertrain Control Module (PCM) monitors various parameters. Common causes include Faulty Electronic Brake Control Module (EBCM), 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: C1275 GMC indicates PCM Serial Data Malfunction.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), 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 1,524

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 Jan 20, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1275 GMC Description

The Powertrain Control Module (PCM) monitors various parameters. The PCM sets the OBDII code and will not allow traction control operation if any parameter falls outside a specified range. The PCM diagnoses a condition preventing the engine control portion of the traction control function and sends a serial data message to the Electronic Brake Control Module (EBCM) indicating that torque reduction is not allowed. The PCM will typically set a Diagnostic Trouble Code (DTC) and the EBCM will set this DTC.

OBDII Code C1275 GMC - PCM Serial Data Malfunction - AutoCodes.com — C1275 GMC Code - PCM Serial Data Malfunction

What does this mean?

What are the Possible Causes of the DTC C1275 GMC?

Faulty Electronic Brake Control Module (EBCM)
Faulty Powertrain Control Module (PCM)

How to Fix the DTC C1275 GMC?

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 C1275 GMC 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 C1275 GMC Code

1. What are the common symptoms of OBDII code C1275 GMC (PCM Serial Data Malfunction)?

- Common symptoms include issues with the vehicle's transmission, ABS system, and stability control system, as well as dashboard warning lights being illuminated.

2. What can cause the OBDII code C1275 GMC to be triggered?

- The code C1275 GMC can be triggered by a malfunction in the PCM's serial data communication, which can be caused by wiring issues, a faulty PCM, or a problem with the network communication bus.

3. How can I diagnose the cause of the PCM Serial Data Malfunction (C1275) code?

- A thorough diagnostic scan using an OBDII scanner can help pinpoint the exact cause of the C1275 code. Checking the wiring connections, inspecting the PCM, and testing the network communication bus are some diagnostic steps to consider.

4. Can I drive my vehicle with the C1275 GMC code present?

- It is not recommended to drive your vehicle with the C1275 code present, as it can lead to potential safety issues due to the malfunctions in transmission, ABS, or stability control systems.

5. How can I repair the PCM Serial Data Malfunction (C1275) code?

- Repairing the C1275 code typically involves fixing any wiring issues, replacing a faulty PCM, or addressing problems with the network communication bus. It is recommended to seek professional assistance for an accurate diagnosis and repair.

6. Are there any DIY tips for fixing the C1275 GMC code?

- While some wiring checks can be done by DIY enthusiasts, it is advisable to consult a professional mechanic for diagnosing and repairing the PCM Serial Data Malfunction (C1275) code to ensure proper resolution.

7. Can resetting the PCM clear the C1275 code?

- Resetting the PCM may temporarily clear the C1275 code, but if the underlying issue causing the malfunction is not addressed, the code is likely to reappear. It is best to diagnose and repair the root cause of the code.

8. How much does it cost to repair the PCM Serial Data Malfunction (C1275) code?

- The cost of repairing the C1275 code can vary depending on the specific cause of the malfunction, parts needed for replacement, labor rates, and location. It is recommended to obtain quotes from reputable mechanics for an accurate cost estimate.

9. Can a faulty ABS module trigger the C1275 code?

- Yes, a faulty ABS module can potentially trigger the C1275 code due to communication issues with the PCM. It is important to conduct thorough diagnostics to pinpoint the exact cause of the code.

10. Is the PCM Serial Data Malfunction (C1275) code a common issue in GMC vehicles?

- The C1275 code related to PCM Serial Data Malfunction can occur in various GMC vehicles, particularly in models equipped with advanced electronic control systems. Regular maintenance and timely diagnostics can help prevent such issues.