P1843 Infiniti Code - Automatic Transmission Fluid Pressure Switch 3
Quick Answer
The Fail-safe function to detect front brake clutch solenoid valve condition. Common causes include Faulty Automatic Transmission Fluid (ATF) Pressure Switch 3, Automatic Transmission Fluid (ATF) Pressure Switch 3 harness is open or shorted, Automatic Transmission Fluid (ATF) Pressure Switch 3 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
- P1843 Infiniti indicates Automatic Transmission Fluid Pressure Switch 3.
- Common causes
- Common causes include Faulty Automatic Transmission Fluid (ATF) Pressure Switch 3, Automatic Transmission Fluid (ATF) Pressure Switch 3 harness is open or shorted, Automatic Transmission Fluid (ATF) Pressure Switch 3 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.
Code P1843 Infiniti Description
What are the Possible Causes of the DTC P1843 Infiniti?
- Faulty Automatic Transmission Fluid (ATF) Pressure Switch 3
- Automatic Transmission Fluid (ATF) Pressure Switch 3 harness is open or shorted
- Automatic Transmission Fluid (ATF) Pressure Switch 3 circuit poor electrical connection
How to Fix the DTC P1843 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 P1843 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.
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Information for Specific Infiniti Models
- P1843 2003 Infiniti G35 — Automatic Transmission Fluid Pressure Switch 3
- P1843 2004 Infiniti G35 — Automatic Transmission Fluid Pressure Switch 3
- P1843 2005 Infiniti G35 — Automatic Transmission Fluid Pressure Switch 3
- P1843 2006 Infiniti G35 — Automatic Transmission Fluid Pressure Switch 3
Frequently Asked Questions about P1843 Infiniti Code
What does the OBDII code P1843 mean for an Infiniti?
P1843 indicates an issue with the Automatic Transmission Fluid Pressure (ATF) Switch 3, which helps monitor hydraulic pressure in the transmission system.
What are the common symptoms of code P1843 on an Infiniti?
Symptoms may include erratic shifting, transmission slipping, poor fuel economy, or the vehicle entering limp mode.
What causes the P1843 code to be triggered on an Infiniti?
Common causes include a faulty ATF pressure switch, damaged or corroded wiring, low transmission fluid levels, or a malfunctioning transmission control module (TCM).
How can I diagnose the P1843 code on an Infiniti vehicle?
Start by checking the transmission fluid level and condition. Inspect the ATF pressure switch and its wiring for damage, then use a diagnostic scanner to monitor live transmission data.
Can I drive my Infiniti with the P1843 code active?
Driving with this code is not recommended as it may lead to further transmission damage or unsafe driving conditions due to shifting issues.
How do I fix the P1843 code on an Infiniti?
Repairs could include replacing the ATF pressure switch, repairing damaged wiring, topping off or replacing the transmission fluid, or reprogramming the TCM if necessary.
How much does it cost to fix the P1843 code on an Infiniti?
The cost varies depending on the specific repair, with ATF pressure switch replacement typically costing $150–$300, while wiring repairs or TCM reprogramming may cost more.
Can low transmission fluid cause the P1843 code to appear?
Yes, low or contaminated transmission fluid can cause hydraulic pressure issues, potentially triggering the P1843 code.
What tools do I need to troubleshoot the P1843 code on an Infiniti?
You'll need a diagnostic scanner capable of reading transmission codes, a multimeter to check wiring continuity, and basic tools to inspect or replace components.
Does clearing the P1843 code fix the problem on an Infiniti?
Clearing the code without addressing the root cause will not fix the issue, and the code is likely to return once the vehicle is driven.
Discuss the causes and fixes for P1843 Infiniti OBDII Code
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