AutoCodes – Cadillac – P16F4 Cadillac

P16F4 Cadillac 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 Cadillac 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 1,093

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 Jan 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16F4 Cadillac 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 Cadillac - Control Module Transmission Range Switch Input Circuitry Performance - AutoCodes.com — P16F4 Cadillac Code - Control Module Transmission Range Switch Input Circuitry Performance

What does this mean?

What are the Possible Causes of the DTC P16F4 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

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

The common symptoms include issues with gear shifting, transmission slipping, poor fuel economy, and the transmission being stuck in one gear.

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

Possible causes include a faulty transmission range switch, damaged wiring or connectors in the transmission range switch circuit, a malfunctioning transmission control module, or software issues.

3. How can I diagnose OBDII code P16F4 in a Cadillac?

Diagnosis typically involves using a diagnostic scanner to retrieve the fault code, checking the transmission range switch and its wiring for any visible damage, and testing the transmission control module.

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

It is not recommended to drive your Cadillac with this code present, as it can lead to serious transmission issues and potential safety hazards. It is best to address the problem promptly.

5. How can I repair OBDII code P16F4 in a Cadillac?

Repair options may include replacing the transmission range switch, repairing or replacing damaged wiring or connectors, reprogramming the transmission control module, or addressing any other underlying issues causing the code.

6. What should I do if OBDII code P16F4 keeps coming back in my Cadillac?

If the code keeps coming back after repairs, it may indicate an ongoing issue that requires further diagnosis. It is recommended to seek professional help to pinpoint the exact cause of the recurring problem.

7. Is it possible to reset OBDII code P16F4 in a Cadillac without fixing the underlying issue?

Resetting the code without addressing the underlying problem will only temporarily clear the check engine light. The issue causing the code will persist and may lead to more severe transmission problems in the future.

8. How much does it typically cost to repair OBDII code P16F4 in a Cadillac?

The cost of repair can vary depending on the specific cause of the code, the required parts, and labor costs. It is advisable to get a diagnostic and repair estimate from a qualified mechanic.

9. Can a DIY enthusiast fix OBDII code P16F4 in a Cadillac?

While some simple repairs like checking and cleaning connectors or replacing the transmission range switch can be done by DIY enthusiasts, diagnosing and repairing complex transmission issues may require specialized tools and expertise best handled by a professional mechanic.

10. How long does it take to repair OBDII code P16F4 in a Cadillac?

The repair time can vary based on the exact cause of the code and the complexity of the repair. Simple fixes may take a few hours, while more intricate repairs could require a day or more to complete.