AutoCodes – Infiniti – P1845 Infiniti

P1845 Infiniti Code - Automatic Transmission Fluid Pressure Switch 5

Quick Answer

The Fail-safe function to detect front brake clutch solenoid valve condition. Common causes include Faulty Automatic Transmission Fluid (ATF) Pressure Switch 5, Automatic Transmission Fluid (ATF) Pressure Switch 5 harness is open or shorted, Automatic Transmission Fluid (ATF) Pressure Switch 5 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: P1845 Infiniti indicates Automatic Transmission Fluid Pressure Switch 5.
Common causes: Common causes include Faulty Automatic Transmission Fluid (ATF) Pressure Switch 5, Automatic Transmission Fluid (ATF) Pressure Switch 5 harness is open or shorted, Automatic Transmission Fluid (ATF) Pressure Switch 5 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 4,400

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1845 Infiniti Description

The Fail-safe function to detect front brake clutch solenoid valve condition. Diagnostic Trouble Code (DTC) P1845 is detected when Transmission Control Module (TCM) detects that actual gear ratio is normal, and relation between gear position and condition of Automatic Transmission Fluid (ATF) Pressure Switch 5 is irregular during depressing accelerator pedal.

OBDII Code P1845 Infiniti - Automatic Transmission Fluid Pressure Switch 5 - AutoCodes.com — P1845 Infiniti Code - Automatic Transmission Fluid Pressure Switch 5

What does this mean?

What are the Possible Causes of the DTC P1845 Infiniti?

Faulty Automatic Transmission Fluid (ATF) Pressure Switch 5
Automatic Transmission Fluid (ATF) Pressure Switch 5 harness is open or shorted
Automatic Transmission Fluid (ATF) Pressure Switch 5 circuit poor electrical connection

How to Fix the DTC P1845 Infiniti?

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 P1845 Infiniti 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 P1845 Infiniti code?

Need more information on how to fix the P1845 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1845 Infiniti code diagnosed by a professional: Find a repair shop in your area

Information for Specific Infiniti Models

P1845 2003 Infiniti G35 — Automatic Transmission Fluid Pressure Switch 5
P1845 2004 Infiniti G35 — Automatic Transmission Fluid Pressure Switch 5
P1845 2005 Infiniti G35 — Automatic Transmission Fluid Pressure Switch 5
P1845 2006 Infiniti G35 — Automatic Transmission Fluid Pressure Switch 5

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 P1845 Infiniti Code

1. What does OBDII code P1845 mean on an Infiniti?

Code P1845 indicates a fault with the Automatic Transmission Fluid Pressure Switch 5, which monitors hydraulic pressure in the transmission.

2. What are the symptoms of code P1845 in an Infiniti?

Symptoms may include erratic shifting, transmission slipping, reduced performance, or the transmission entering limp mode. The check engine light may also illuminate.

3. What causes code P1845 in an Infiniti?

Common causes include a faulty transmission fluid pressure switch, wiring or connector issues, low or dirty transmission fluid, or internal transmission problems.

4. Can low transmission fluid cause code P1845?

Yes, insufficient or contaminated transmission fluid can lead to incorrect pressure readings and trigger the P1845 code.

5. How is code P1845 diagnosed in an Infiniti?

A mechanic will use a scan tool to verify the code, inspect the transmission fluid, check the wiring and connectors, and test the pressure switch for proper operation.

6. Can I drive my Infiniti with code P1845?

Driving with this code is not recommended, as it can lead to further transmission damage and reduced vehicle performance.

7. How do you fix code P1845 on an Infiniti?

Repairs may involve replacing the faulty pressure switch, repairing damaged wiring, flushing and refilling the transmission fluid, or addressing internal transmission issues.

8. How much does it cost to fix code P1845 in an Infiniti?

Repair costs vary but typically range from $150 to $400 for pressure switch replacement. Additional costs may apply if further transmission repairs are needed.

9. Can I reset code P1845 without fixing the issue?

Clearing the code without addressing the underlying problem is not advised, as the issue will likely return and could cause further damage.

10. How can I prevent code P1845 in my Infiniti?

Regularly maintain your transmission by checking fluid levels, using the correct fluid type, and addressing transmission issues promptly to avoid pressure-related problems.