AutoCodes – Generic – P150C

P150C 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 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 15,497

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 Sep 28, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P150C 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 - Transmission Control Module Engine Speed Request Signal Message Counter Incorrect - AutoCodes.com — P150C Code - Transmission Control Module Engine Speed Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P150C?

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?

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 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 code?

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

Need Help with the Code?

Get the P150C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P150C Buick — Transmission Control Module Engine Speed Request Signal Message Counter Incorrect
P150C Cadillac — Transmission Control Module Engine Speed Request Signal Message Counter Incorrect
P150C Chevrolet — Transmission Control Module Engine Speed Request Signal Message Counter Incorrect
P150C GMC — Transmission Control Module Engine Speed Request Signal Message Counter Incorrect

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 Code

1. What are common symptoms of OBDII code P150C?

- Common symptoms include issues with shifting gears, transmission slipping, rough shifting, and potential stalling of the vehicle.

2. What can cause the OBDII code P150C to trigger?

- The code P150C is typically triggered when the Transmission Control Module (TCM) receives an incorrect message counter related to the engine speed request signal.

3. How serious is the OBDII code P150C?

- The code P150C can affect the performance and drivability of the vehicle, so it should be addressed promptly to prevent further transmission or engine issues.

4. Can a malfunctioning sensor cause OBDII code P150C?

- Yes, a faulty engine speed sensor or transmission speed sensor can sometimes cause the TCM to receive incorrect signals, triggering the code P150C.

5. How can I diagnose the OBDII code P150C?

- Diagnosis typically involves using a scan tool to read the code, checking the engine and transmission speed sensors, and inspecting the wiring and connections for any issues.

6. Are there any DIY repair tips for OBDII code P150C?

- DIY repair tips include checking and cleaning the sensor connectors, inspecting for damaged wiring, and ensuring proper sensor alignment and functionality.

7. Is it safe to continue driving with the OBDII code P150C?

- It is not recommended to continue driving with the code P150C, as it can lead to further transmission problems and potential safety hazards on the road.

8. Can a software update fix OBDII code P150C?

- Sometimes, a software update for the TCM or engine control module can address communication errors and resolve the code P150C without the need for major repairs.

9. How much does it typically cost to repair OBDII code P150C?

- The cost of repairing the code P150C can vary depending on the underlying cause, but it may range from a simple sensor replacement to more complex wiring or module repairs.

10. Will resetting the OBDII code P150C make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and fix the root cause of the problem.