Engine-Codes.com
Engine-Codes – Infiniti – P1820 Infiniti

P1820 Infiniti Code - Engine Speed Signal

Quick Answer

The P1820 Infiniti trouble code refers to the Engine Speed Signal. Common causes include Faulty engine speed sensor, Dirty or damaged engine speed sensor, Wiring issues (short or open 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
P1820 Infiniti indicates Engine Speed Signal.
Common causes
Common causes include Faulty engine speed sensor, Dirty or damaged engine speed sensor, Wiring issues (short or open 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 09, 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 P1820 Infiniti Description

The P1820 Infiniti trouble code refers to the Engine Speed Signal. This code indicates that there is a problem with the signal being sent from the engine speed sensor to the engine control module (ECM). The engine speed sensor, also known as the crankshaft position sensor, is responsible for monitoring the engine's rotational speed. This information is crucial for the ECM to determine the ignition timing, fuel injection timing, and other engine functions.

OBDII Code P1820 Infiniti - Engine Speed Signal
P1820 Infiniti Code - Engine Speed Signal

Common Causes of P1820 Infiniti

  1. Faulty engine speed sensor
  2. Dirty or damaged engine speed sensor
  3. Wiring issues (short or open circuit)
  4. ECM malfunction
  5. Poor electrical connection

Symptoms of P1820 Infiniti

  1. Rough idling
  2. Stalling
  3. Hesitation during acceleration
  4. Difficulty starting
  5. Engine misfires

How to Fix P1820 Infiniti

  1. Begin by diagnosing the issue with a scan tool to confirm the P1820 code and pinpoint the exact cause.
  2. Inspect the engine speed sensor for any visible damage or contamination. Clean or replace the sensor as necessary.
  3. Check the wiring for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring.
  4. Reset the ECM and clear the trouble code.
  5. Test drive the vehicle to ensure that the issue has been resolved and that the engine speed signal is being received accurately.

Cost to Fix P1820 Infiniti

The cost of repairing the P1820 Infiniti trouble code can vary depending on the cause of the issue and the specific vehicle model. In general, the cost of replacing an engine speed sensor can range from $100 to $300, including parts and labor. However, additional costs may apply if wiring repairs or ECM replacement are necessary. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs. Keep in mind that labor rates can vary, so it's advisable to shop around for the best price in your area.

Need more information about the P1820 Infiniti code?

Need more information on how to fix the P1820 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1820 Infiniti 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 P1820 Infiniti Code

1. What does the OBDII code P1820 mean on an Infiniti?

P1820 indicates an issue with the engine speed signal, which is critical for proper transmission and engine operation.

2. What are the common symptoms of a P1820 code on an Infiniti?

Symptoms may include erratic shifting, reduced engine performance, the transmission stuck in one gear, or the check engine light turning on.

3. What causes the P1820 code on an Infiniti?

Common causes include a faulty engine speed sensor, damaged wiring or connectors, or a malfunctioning transmission control module (TCM).

4. Can I still drive my Infiniti with the P1820 code?

Driving with a P1820 code may result in poor performance and potential damage to the transmission, so it’s best to address the issue promptly.

5. How is the P1820 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the engine speed sensor and related wiring, and perform tests on the TCM if necessary.

6. How do you fix the P1820 code on an Infiniti?

Repairs may include replacing the engine speed sensor, repairing damaged wiring, or reprogramming or replacing the TCM.

7. How much does it cost to repair the P1820 code on an Infiniti?

The repair cost varies depending on the issue, but sensor replacement typically ranges from $150 to $300, including labor.

8. What tools are needed to troubleshoot a P1820 code?

A diagnostic scan tool, multimeter, and possibly an oscilloscope are needed to properly diagnose and troubleshoot this code.

9. Can a dirty or contaminated transmission fluid cause the P1820 code?

While uncommon, dirty or contaminated transmission fluid can sometimes lead to sensor issues or poor signal transmission, contributing to the code.

10. Is the P1820 code specific to Infiniti vehicles?

No, P1820 is a generic OBDII code, but the exact meaning and repair procedures can vary depending on the make and model. For Infiniti, it relates to the engine speed signal.

Discuss the causes and fixes for P1820 Infiniti OBDII Code

Submit a New Comment

Code P1820 Infiniti comments

No comments found for this page.