AutoCodes – Cadillac – P1780 Cadillac

P1780 Cadillac 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 Cadillac 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 10,758

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 Cadillac Description

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

What does this mean?

What are the Possible Causes of the DTC P1780 Cadillac?

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 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 P1780 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.

Need more information about the P1780 Cadillac code?

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

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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 Cadillac Code

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

- Common symptoms include issues with starting the vehicle, problems shifting gears, and the inability to start the engine in Park or Neutral.

2. What usually causes the OBDII code P1780 in a Cadillac to trigger?

- The code P1780 is typically triggered by a malfunction in the park/neutral position switch circuit, which may be caused by a faulty switch, wiring issues, or a bad connection.

3. How can I diagnose the OBDII code P1780 in my Cadillac?

- Diagnosing the code P1780 involves checking the park/neutral position switch, inspecting the wiring for any damage, and testing the switch for continuity and proper operation.

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

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

5. What are some repair tips for fixing the OBDII code P1780 in a Cadillac?

- Repair tips include replacing the park/neutral position switch if faulty, repairing any damaged wiring, ensuring all connections are secure, and clearing the code to see if the issue is resolved.

6. How much does it typically cost to repair the OBDII code P1780 in a Cadillac?

- The cost of repairing the code P1780 can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Can a DIY enthusiast fix the OBDII code P1780 in a Cadillac?

- Depending on your skill level and experience with automotive repairs, you may be able to fix the code P1780 yourself by following a repair manual or online guides.

8. Will resetting the OBDII code P1780 in my Cadillac temporarily solve the issue?

- Resetting the code may temporarily clear the warning light, but if the underlying issue with the park/neutral position switch circuit is not fixed, the code is likely to reappear.

9. How long does it take to repair the OBDII code P1780 in a Cadillac?

- Repairing the code P1780 can typically be done within a few hours, but the exact time may vary depending on the extent of the issue and availability of parts.

10. Is the OBDII code P1780 in a Cadillac a common problem?

- The code P1780 related to the Park Neutral Position Switch Circuit is a relatively common issue in Cadillac vehicles, especially in older models or those with high mileage.