P150C 2016 GMC Sierra 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 2016 GMC Sierra 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.
Code P150C 2016 GMC Sierra Description
What are the Possible Causes of the DTC P150C 2016 GMC Sierra?
- 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 2016 GMC Sierra?
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 2016 GMC Sierra 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 2016 GMC Sierra code?
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Frequently Asked Questions about P150C 2016 GMC Sierra Code
1. What does the OBDII code P150C mean on a 2016 GMC Sierra?
The P150C code indicates that the Transmission Control Module (TCM) has detected an issue with the engine speed request signal, specifically that the message counter is incorrect or invalid.
2. What are common symptoms of code P150C on a GMC Sierra?
Symptoms may include reduced engine performance, transmission shifting issues, a check engine light, or the vehicle entering limp mode.
3. What causes the P150C code to appear?
Common causes include a faulty TCM, wiring or connector issues between the TCM and Engine Control Module (ECM), or software corruption in one of the control modules.
4. Can a bad TCM cause the P150C code?
Yes, a malfunctioning TCM can cause the P150C code by failing to send or interpret the engine speed request signal correctly.
5. How do I diagnose the P150C code on my 2016 GMC Sierra?
Diagnosis involves scanning for additional codes, inspecting the wiring and connectors between the TCM and ECM, and testing the TCM and ECM for proper communication and functionality.
6. Can I fix the P150C code without replacing the TCM?
In some cases, the issue could be resolved by repairing damaged wiring, cleaning corroded connectors, or updating the TCM/ECM software rather than replacing the TCM.
7. What tools are needed to troubleshoot the P150C code?
You’ll need an OBDII scanner capable of reading advanced transmission codes, a multimeter to check wiring continuity, and possibly access to the vehicle’s factory service manual.
8. How serious is the P150C code on a GMC Sierra?
It’s a moderately serious issue, as it can affect transmission performance and may cause the vehicle to enter limp mode, limiting drivability.
9. Can a software update fix the P150C code?
Yes, if the issue is related to software corruption or outdated firmware in the TCM or ECM, a software update might resolve the problem.
10. Should I drive my GMC Sierra with the P150C code active?
It’s not recommended, as the issue can lead to poor transmission performance or further damage. Addressing the problem promptly is best to avoid worsening the condition.
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