Engine-Codes.com
Engine-Codes – Generic – P1C99

P1C99 Code - Gear Shift Position Sensor 1 Circuit

Quick Answer

The P1C99 code indicates a problem with the Gear Shift Position Sensor 1 Circuit in the vehicle. Common causes include Faulty Gear Shift Position Sensor, Damaged wiring or connectors, Corrosion in the sensor circuit. 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
P1C99 indicates Gear Shift Position Sensor 1 Circuit.
Common causes
Common causes include Faulty Gear Shift Position Sensor, Damaged wiring or connectors, Corrosion in the sensor circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1C99 Description

The P1C99 code indicates a problem with the Gear Shift Position Sensor 1 Circuit in the vehicle. This sensor is responsible for detecting the position of the gear shifter and sending this information to the vehicle's transmission control module. If there is a fault in this circuit, it can lead to issues with the vehicle's shifting performance, potentially causing the transmission to shift erratically or not at all.

OBDII Code P1C99 - Gear Shift Position Sensor 1 Circuit
P1C99 Code - Gear Shift Position Sensor 1 Circuit

Common Causes of P1C99

  1. Faulty Gear Shift Position Sensor
  2. Damaged wiring or connectors
  3. Corrosion in the sensor circuit
  4. Issues with the transmission control module
  5. Electrical problems in the circuit

Symptoms of P1C99

  1. Erratic or delayed shifting
  2. Transmission slipping
  3. Inability to shift gears
  4. Limp mode activation
  5. Dashboard warning light illuminated

How to Fix P1C99

  1. Begin by connecting a diagnostic scanner to the vehicle's onboard computer to retrieve the fault code and confirm the issue.
  2. Inspect the Gear Shift Position Sensor and its wiring for any visible damage or corrosion. Replace any damaged components as needed.
  3. Test the sensor's functionality using a multimeter to ensure it is sending accurate signals to the transmission control module.
  4. Check the transmission control module for any faults or programming issues that may be causing the problem. Reset or reprogram the module as necessary.
  5. Clear the fault code from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1C99

The typical repair costs for addressing a Gear Shift Position Sensor 1 Circuit issue can vary depending on the extent of the problem and the specific components that need replacement. On average, the parts for this repair can range from $100 to $300, while labor costs can be anywhere from $150 to $400. It's important to note that the actual costs may differ based on the vehicle's make and model, as well as the location and rates of the auto repair shop. It's recommended to obtain quotes from several shops to compare prices and ensure a fair repair cost.

Need more information about the P1C99 code?

Need more information on how to fix the P1C99 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1C99 code diagnosed by a professional: Find a repair shop in your area

Code P1C99 Information for Specific Makes

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 P1C99 Code

What does OBDII code P1C99 mean?

OBDII code P1C99 indicates a problem with the Gear Shift Position Sensor 1 Circuit, which monitors the position of the gear shift in automatic transmission vehicles.

What are the common symptoms of P1C99?

Common symptoms include the transmission not shifting properly, the vehicle being stuck in one gear, or the check engine light being illuminated.

What could cause the P1C99 code to trigger?

Causes may include a faulty gear shift position sensor, damaged wiring or connectors, or issues with the transmission control module.

How can I diagnose the issue related to P1C99?

To diagnose, start with a visual inspection of the wiring and connectors, check for any other related trouble codes, and test the gear shift position sensor for proper operation.

Is it safe to drive with the P1C99 code?

Driving with the P1C99 code is not recommended as it may result in erratic shifting or transmission damage, which can lead to safety concerns.

What are some common repairs for code P1C99?

Common repairs include replacing the gear shift position sensor, repairing or replacing damaged wiring, or reprogramming the transmission control module.

How can I prevent the P1C99 code from returning?

To prevent recurrence, ensure regular maintenance of the transmission system, check wiring for wear, and promptly address any shifting issues.

Can I clear the P1C99 code without fixing the issue?

Yes, you can clear the code using an OBDII scanner, but if the underlying problem is not resolved, the code will likely return.

What is the average cost to repair P1C99?

The cost to repair P1C99 can vary widely, but it typically ranges from $100 to $500 depending on whether you need to replace the sensor or repair wiring.

Discuss the causes and fixes for P1C99 OBDII Code

Submit a New Comment

Code P1C99 comments

No comments found for this page.