AutoCodes – Pontiac – P1780 Pontiac

P1780 Pontiac 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 Pontiac 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 553

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 Feb 04, 2021

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

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

What does this mean?

What are the Possible Causes of the DTC P1780 Pontiac?

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 Pontiac?

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 Pontiac 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 Pontiac code?

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

Need Help with the Code?

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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 P1780 Pontiac Code

1. What are the common symptoms of OBDII code P1780 in a Pontiac related to the Park Neutral Position (PNP) switch circuit?

- Common symptoms include difficulty starting the vehicle, illumination of the Check Engine Light, and issues with shifting gears.

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

- The code may be triggered by a faulty Park Neutral Position switch, damaged wiring in the PNP circuit, or a malfunctioning transmission range sensor.

3. How can I diagnose the P1780 code in my Pontiac related to the Park Neutral Position switch circuit?

- Diagnosing the code involves checking the PNP switch for proper operation, inspecting the wiring for any damage, and testing the transmission range sensor.

4. Can a DIY enthusiast repair the P1780 OBDII code in a Pontiac, or is professional assistance necessary?

- While some experienced DIYers may be able to tackle the repair, it is recommended to seek professional assistance due to the complexity of the transmission and electrical components involved.

5. Are there any quick fixes or temporary solutions for the P1780 code in a Pontiac?

- Quick fixes such as resetting the Check Engine Light may temporarily address the issue, but it is essential to diagnose and repair the underlying cause to prevent further problems.

6. How important is it to address the P1780 OBDII code in a Pontiac promptly?

- It is crucial to address the P1780 code promptly as ignoring it can lead to drivability issues, potential safety hazards, and further damage to the transmission system.

7. Is the P1780 OBDII code in a Pontiac a common issue, or is it relatively rare?

- While not as common as some other OBDII codes, encountering the P1780 code related to the Park Neutral Position switch circuit can still occur in Pontiac vehicles.

8. Can extreme weather conditions or driving habits contribute to the triggering of the P1780 code in a Pontiac?

- Extreme weather conditions or rough driving habits may exacerbate existing issues with the Park Neutral Position switch circuit, potentially leading to the activation of the P1780 code.

9. How much does it typically cost to repair the P1780 OBDII code in a Pontiac at a professional auto repair shop?

- The cost of repairing the P1780 code in a Pontiac can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can regular maintenance or servicing help prevent the occurrence of the P1780 OBDII code in a Pontiac?

- Regular maintenance, such as checking and replacing worn-out components in the transmission system, can help prevent issues that may trigger the P1780 code related to the Park Neutral Position switch circuit.