AutoCodes – Chevrolet – P1780 Chevrolet

P1780 Chevrolet Code - Park Neutral Position Switch Circuit

Quick Answer

With the engine running with an engine speed change from below 300 rpm to over 500 with the VSS input at 0 mph and the Park Neutral Position (PNP) switch signal open (R, D, 2 or L gear positions), or a PNP switch closed (P/N position) input was detected for 10 seconds with the engine is running at over 2500 RPM and over a 38 5% calculated load value. Common causes include Faulty Park Neutral Position Switch, Park Neutral Position Switch harness is open or shorted, Park Neutral Position 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: P1780 Chevrolet indicates Park Neutral Position Switch Circuit.
Common causes: Common causes include Faulty Park Neutral Position Switch, Park Neutral Position Switch harness is open or shorted, Park Neutral Position 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 6,591

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 18, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1780 Chevrolet Description

OBDII Code P1780 Chevrolet - Park Neutral Position Switch Circuit - AutoCodes.com — P1780 Chevrolet Code - Park Neutral Position Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P1780 Chevrolet?

Faulty Park Neutral Position Switch
Park Neutral Position Switch harness is open or shorted
Park Neutral Position Switch circuit poor electrical connection

How to Fix the DTC P1780 Chevrolet?

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 P1780 Chevrolet 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 P1780 Chevrolet code?

Need more information on how to fix the P1780 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1780 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 P1780 Chevrolet Code

1. What are the common symptoms of OBDII code P1780 in a Chevrolet related to the Park Neutral Position Switch Circuit?

- Common symptoms include difficulty starting the vehicle, the engine not cranking or starting at all, and issues shifting gears.

2. What are the possible causes of OBDII code P1780 in a Chevrolet?

- The code P1780 in a Chevrolet is often caused by a faulty park/neutral position switch, wiring issues, or a malfunctioning transmission range sensor.

3. How can I diagnose the OBDII code P1780 in a Chevrolet?

- You can diagnose the code by using an OBDII scanner to retrieve the specific fault code, inspecting the park/neutral position switch for any visible damage, and checking the wiring connections for loose or corroded terminals.

4. Can I drive my Chevrolet with OBDII code P1780 present?

- It is not recommended to drive your Chevrolet with the OBDII code P1780 present, as it can lead to further transmission problems and potential safety issues.

5. How can I repair OBDII code P1780 in a Chevrolet related to the Park Neutral Position Switch Circuit?

- Repairing the code P1780 may involve replacing the park/neutral position switch, repairing or replacing damaged wiring, or recalibrating the transmission range sensor.

6. Are there any DIY tips for fixing OBDII code P1780 in a Chevrolet?

- DIY tips include checking and cleaning the park/neutral position switch connectors, ensuring proper wiring connections, and consulting the vehicle's service manual for specific repair procedures.

7. Is it safe to reset the OBDII code P1780 in a Chevrolet?

- While you can reset the code temporarily, it is crucial to investigate and repair the underlying issue causing the code to prevent potential transmission problems and ensure safe vehicle operation.

8. How much does it cost to repair OBDII code P1780 in a Chevrolet at a mechanic?

- The cost of repairing OBDII code P1780 in a Chevrolet can vary depending on the exact cause, but it may range from $150 to $400, including parts and labor.

9. Will OBDII code P1780 cause my Chevrolet to fail an emissions test?

- Yes, OBDII code P1780 can cause your Chevrolet to fail an emissions test, as it indicates a malfunction in the Park Neutral Position Switch Circuit that can impact the vehicle's emissions control system.

10. How can I prevent OBDII code P1780 from occurring in my Chevrolet?

- To prevent OBDII code P1780, regularly inspect and maintain the park/neutral position switch, address any wiring issues promptly, and follow the recommended maintenance schedule for your Chevrolet.