AutoCodes – Chevrolet – P150C 2015 Chevrolet Silverado

P150C 2015 Chevrolet Silverado Code - Transmission Control Module Engine Speed Request Signal Message Counter Incorrect

Quick Answer

To improve vehicle shift, and feel, the Transmission Control Module (TCM) is constantly sending the Engine Control Module (ECM) serial data messages with information regarding its request for modifying engine speed or torque. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection. 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: P150C 2015 Chevrolet Silverado indicates Transmission Control Module Engine Speed Request Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection.
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 330

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 28, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P150C 2015 Chevrolet Silverado Description

To improve vehicle shift, and feel, the Transmission Control Module (TCM) is constantly sending the Engine Control Module (ECM) serial data messages with information regarding its request for modifying engine speed or torque. The ECM sets this code when it detects a discrepancy in the structure of this message causing its integrity to be questioned. An intermittent fault in the Controller Area Network (CAN) circuits will cause Diagnostic Trouble Code (DTC) P150C to set.

OBDII Code P150C 2015 Chevrolet Silverado - Transmission Control Module Engine Speed Request Signal Message Counter Incorrect - AutoCodes.com — P150C 2015 Chevrolet Silverado Code - Transmission Control Module Engine Speed Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P150C 2015 Chevrolet Silverado?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC P150C 2015 Chevrolet Silverado?

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 P150C 2015 Chevrolet Silverado 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 P150C 2015 Chevrolet Silverado code?

Need more information on how to fix the P150C 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P150C 2015 Chevrolet Silverado Code

1. What does OBDII code P150C mean on a 2015 Chevrolet Silverado?

P150C indicates that the Transmission Control Module (TCM) has detected an issue with the engine speed request signal message counter being incorrect or inconsistent.

2. What are the common symptoms of a P150C code in a Chevrolet Silverado?

Symptoms may include erratic shifting, reduced engine performance, the transmission going into limp mode, or the check engine light being illuminated.

3. What causes the P150C code to appear in a 2015 Chevrolet Silverado?

Common causes include faulty wiring or connections between the TCM and Engine Control Module (ECM), a malfunctioning TCM, or software issues in either the TCM or ECM.

4. Can a loose or damaged wiring harness trigger the P150C code?

Yes, loose, corroded, or damaged wiring and connectors can disrupt communication between the TCM and ECM, leading to this code.

5. How do you diagnose the P150C code on a Chevrolet Silverado?

Diagnosis involves scanning for additional codes, inspecting wiring and connectors, checking for communication issues between the TCM and ECM, and testing the TCM for proper operation.

6. Is the P150C code specific to the 2015 Chevrolet Silverado?

No, while it appears on the 2015 Silverado, this code can also occur on other vehicles with similar TCM and ECM configurations.

7. Can updating the TCM or ECM software fix the P150C code?

Yes, in some cases, reprogramming or updating the software can resolve communication errors causing the code.

8. What repairs are typically needed to fix the P150C code?

Repairs may include fixing or replacing damaged wiring, connectors, or the TCM itself, as well as performing software updates if necessary.

9. Can driving with a P150C code damage the transmission?

Yes, ignoring this code can lead to further transmission issues or damage due to erratic shifting or prolonged operation in limp mode.

10. Do I need a professional mechanic to fix the P150C code?

While some issues like inspecting wiring can be done by experienced DIYers, diagnosing and repairing TCM or ECM problems often requires specialized tools and expertise.