AutoCodes – Chevrolet – P0843 2017 Chevrolet Silverado

P0843 2017 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 1 Circuit High Voltage

Quick Answer

The Transmission Fluid Pressure (TFP) switch 1 is part of the control solenoid valve assembly, which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly. 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: P0843 2017 Chevrolet Silverado indicates Transmission Fluid Pressure Switch 1 Circuit High Voltage.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly.
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 287

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 Aug 02, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0843 2017 Chevrolet Silverado Description

The Transmission Fluid Pressure (TFP) switch 1 is part of the control solenoid valve assembly, which has no serviceable parts. The Transmission Control Module (TCM) supplies a signal circuit to the TFP Switch 1. The TFP Switch 1 has an internal case ground. TFP Switch 1 is normally closed or LOW. When oil pressure is present at the TFP Switch 1, the switch is open or HIGH. The normally high clutch pressure control (PC) solenoid 2 controls pressure to the 3-5 reverse clutch regulator valve. The TCM monitors the TFP switch 1 to determine the position of the 3-5 reverse clutch regulator valve. When the 3-5 reverse clutch is commanded OFF, pressure is present on the TFP switch 1. When the 3-5 reverse clutch is commanded ON, the 3-5 reverse clutch regulator valve moves and pressure to the TFP switch 1 is exhausted through the 3-5 reverse clutch regulator valve. The Diagnostic Trouble Code (DTC) will be set when the TCM detects that the TFP switch 1 signal voltage remains HIGH after the 3-5-R clutch transitions from a LOW pressure state to a HIGH pressure state. The TCM counts each incident. The DTC sets when 35 counts are accumulated.

OBDII Code P0843 2017 Chevrolet Silverado - Transmission Fluid Pressure Switch 1 Circuit High Voltage - AutoCodes.com — P0843 2017 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 1 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0843 2017 Chevrolet Silverado?

Low transmission fluid level
Dirty transmission fluid
Faulty Transmission Control Solenoid Valve Assembly
Transmission Control Solenoid Valve Assembly harness is open or shorted
Transmission Control Solenoid Valve Assembly circuit poor electrical connection

How to Fix the DTC P0843 2017 Chevrolet Silverado?

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 P0843 2017 Chevrolet Silverado 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 P0843 2017 Chevrolet Silverado code?

Need more information on how to fix the P0843 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0843 2017 Chevrolet Silverado 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 P0843 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0843 in a 2017 Chevrolet Silverado?

The common symptoms of OBDII code P0843 in a 2017 Chevrolet Silverado include harsh shifting, transmission slippage, and a lit Check Engine Light.

2. What does the OBDII code P0843 on a 2017 Chevrolet Silverado indicate?

The OBDII code P0843 on a 2017 Chevrolet Silverado indicates a high voltage condition in Transmission Fluid Pressure Switch 1 Circuit.

3. What are the possible causes of OBDII code P0843 in a 2017 Chevrolet Silverado?

Possible causes of OBDII code P0843 in a 2017 Chevrolet Silverado include a faulty transmission fluid pressure switch, damaged wiring or connectors, low transmission fluid levels, or internal transmission issues.

4. How can I diagnose the OBDII code P0843 in my 2017 Chevrolet Silverado?

Diagnosing OBDII code P0843 in a 2017 Chevrolet Silverado involves using an OBDII scanner to retrieve the code, inspecting the wiring and connectors for any damage, checking the transmission fluid level and condition, and testing the transmission fluid pressure switch.

5. Can I continue driving my 2017 Chevrolet Silverado with OBDII code P0843?

It is not recommended to continue driving your 2017 Chevrolet Silverado with OBDII code P0843 as it can lead to further transmission damage and potential safety hazards. It is advised to have the issue diagnosed and repaired promptly.

6. How can I repair OBDII code P0843 in my 2017 Chevrolet Silverado?

Repairing OBDII code P0843 in a 2017 Chevrolet Silverado may involve replacing the faulty transmission fluid pressure switch, repairing any damaged wiring or connectors, ensuring proper transmission fluid levels, and addressing any internal transmission problems.

7. Are there any DIY fixes for OBDII code P0843 in a 2017 Chevrolet Silverado?

While some basic inspections like checking the transmission fluid level can be done by DIY enthusiasts, diagnosing and repairing OBDII code P0843 typically requires specialized tools and knowledge, so it is recommended to seek professional help for this issue.

8. How much does it cost to repair OBDII code P0843 in a 2017 Chevrolet Silverado?

The cost of repairing OBDII code P0843 in a 2017 Chevrolet Silverado can vary depending on the exact cause of the issue, labor costs in your area, and the prices of replacement parts. It is advisable to get a diagnostic and repair estimate from a qualified mechanic.

9. Can a faulty transmission fluid pressure switch cause other transmission problems besides triggering OBDII code P0843?

Yes, a faulty transmission fluid pressure switch can cause other transmission issues such as erratic shifting, transmission slipping, and poor overall performance. It is essential to address this problem promptly to prevent further damage.

10. Is OBDII code P0843 a common issue in 2017 Chevrolet Silverado vehicles?

While OBDII code P0843 related to the Transmission Fluid Pressure Switch 1 Circuit High Voltage is not as common as some other codes, it can still occur in 2017 Chevrolet Silverado vehicles due to various factors like wear and tear, electrical issues, or fluid leaks.