AutoCodes – Generic – P16F4

P16F4 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,717

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P16F4?

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?

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 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 P16F4 code?

Need more information on how to fix the P16F4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P16F4 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P16F4 Acura — Starter Cut Relay 2 Control Circuit Low Voltage
P16F4 Buick — Control Module Transmission Range Switch Input Circuitry Performance
P16F4 Cadillac — Control Module Transmission Range Switch Input Circuitry Performance
P16F4 Chevrolet — Control Module Transmission Range Switch Input Circuitry Performance
P16F4 GMC — Control Module Transmission Range Switch Input Circuitry Performance
P16F4 Honda — Starter Cut Relay 2 Control Circuit Low Voltage

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 Code

1. What are the common symptoms of OBDII code P16F4?

- Common symptoms include issues with shifting gears, stalling, hesitation, or the transmission not engaging properly.

2. What can cause the OBDII code P16F4 to trigger?

- The code P16F4 is typically triggered by faults in the transmission range switch, wiring issues, or a malfunctioning control module.

3. How serious is the OBDII code P16F4?

- The P16F4 code can affect the performance and reliability of your vehicle's transmission, so it should be addressed promptly to prevent further damage.

4. How can I diagnose the OBDII code P16F4?

- Diagnosis involves using a scan tool to read the code, checking the transmission range switch for proper operation, and inspecting the wiring for any damage.

5. What are some repair tips for fixing the OBDII code P16F4?

- Repair tips may include replacing the transmission range switch, repairing or replacing damaged wiring, or reprogramming the control module if necessary.

6. Can I drive my vehicle with the OBDII code P16F4 present?

- It's not recommended to drive your vehicle with the P16F4 code present, as it can lead to further transmission issues and potentially unsafe driving conditions.

7. What is the cost of repairing the OBDII code P16F4?

- The cost of repairing the P16F4 code can vary depending on the extent of the issue, but it may involve parts replacement, labor costs, and potentially reprogramming fees.

8. How long does it take to repair the OBDII code P16F4?

- The repair time for the P16F4 code can vary based on the specific issue, but it may take a few hours to a full day to diagnose and fix the problem.

9. Can the OBDII code P16F4 be a recurring issue?

- If the underlying cause of the P16F4 code is not properly addressed, it can become a recurring issue and cause ongoing transmission problems.

10. Is it possible to reset the OBDII code P16F4 without repairs?

- While clearing the code may temporarily turn off the check engine light, it's crucial to address the underlying issue to prevent further damage to the transmission.