AutoCodes – Buick – P16F4 Buick

P16F4 Buick Code - Control Module Transmission Range Switch Input Circuitry Performance

Quick Answer

The automatic transmission manual shift shaft position switch assembly, also called the internal mode switch assembly, contains two sliding hall-effect switch assemblies attached to the control valve body within the transmission. Common causes include Faulty Control Module Transmission Range Switch, Control Module Transmission Range Switch harness is open or shorted, Control Module Transmission Range Switch 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: P16F4 Buick indicates Control Module Transmission Range Switch Input Circuitry Performance.
Common causes: Common causes include Faulty Control Module Transmission Range Switch, Control Module Transmission Range Switch harness is open or shorted, Control Module Transmission Range Switch 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 1,115

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16F4 Buick Description

The automatic transmission manual shift shaft position switch assembly, also called the internal mode switch assembly, contains two sliding hall-effect switch assemblies attached to the control valve body within the transmission. The 9 outputs from the switches indicate which position is selected by the transmission manual shaft. Four outputs (A, B, C, P) are range selection inputs to the transmission control module (TCM). Five outputs (R1, R2, D1, D2, S) are direction selection inputs to the hybrid powertrain control module. The Range input signals are represented as TCM scan tool parameters, Internal Mode Switch A, B, C, and P. The Direction input signals are represented as hybrid powertrain control module scan tool parameters, Internal Mode Switch 2 - R1, R2, D1, D2, and S. The input voltage at the modules is high when a switch is open and low when a switch is closed to earth. Each control module independently supplies power and earth to its respective switch assembly.
The hybrid powertrain control module is internal to the power inverter module, often referred to as the drive motor generator power inverter module and is not serviced separately. The hybrid powertrain control module compares the internal mode switch requested direction to other data to verify that the indicated direction and range switch calculation is correct.

OBDII Code P16F4 Buick - Control Module Transmission Range Switch Input Circuitry Performance - AutoCodes.com — P16F4 Buick Code - Control Module Transmission Range Switch Input Circuitry Performance

What does this mean?

What are the Possible Causes of the DTC P16F4 Buick?

Faulty Control Module Transmission Range Switch
Control Module Transmission Range Switch harness is open or shorted
Control Module Transmission Range Switch circuit poor electrical connection

How to Fix the DTC P16F4 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 P16F4 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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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 P16F4 Buick Code

1. What are common symptoms of OBDII code P16F4 in a Buick related to the Control Module Transmission Range Switch Input Circuitry Performance?

- Common symptoms include issues with shifting gears, hesitation or jerking during acceleration, and the transmission staying in one gear.

2. What are possible causes of OBDII code P16F4 in a Buick?

- Possible causes include a faulty transmission range switch, damaged wiring or connectors in the circuitry, or issues with the control module itself.

3. How can I diagnose the cause of OBDII code P16F4 in my Buick?

- Diagnosing the issue involves checking the transmission range switch for proper operation, inspecting the wiring and connectors for damage, and using a scan tool to monitor the input signals to the control module.

4. Can I still drive my Buick with OBDII code P16F4 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the transmission and other components. It's best to address the issue promptly.

5. How can I repair OBDII code P16F4 in my Buick?

- Repairing this code typically involves replacing the faulty transmission range switch, repairing any damaged wiring or connectors, and clearing the code with a scan tool.

6. Are there any DIY tips for troubleshooting OBDII code P16F4 in a Buick?

- DIY tips include checking for visible damage to wiring and connectors, ensuring the transmission range switch is properly aligned and functioning, and consulting the vehicle's service manual for diagnostic procedures.

7. Can a faulty battery or alternator cause OBDII code P16F4 in a Buick?

- While a faulty battery or alternator can cause electrical issues, they are not common causes of this specific OBDII code. Focus on diagnosing the transmission range switch and related circuitry first.

8. Is resetting the check engine light enough to fix OBDII code P16F4 in a Buick?

- Simply resetting the check engine light will not fix the underlying issue causing the code. It's important to diagnose the problem, make necessary repairs, and then clear the code with a scan tool.

9. How long does it typically take to repair OBDII code P16F4 in a Buick?

- The repair time can vary depending on the exact cause of the code and the availability of parts. In general, it can take a few hours to a full day to complete the necessary repairs.

10. Can a mechanic help me diagnose and repair OBDII code P16F4 in my Buick?

- Yes, a qualified mechanic with experience in diagnosing and repairing transmission issues can help you properly address OBDII code P16F4 in your Buick.