AutoCodes – Chevrolet – P0843 2014 Chevrolet Silverado

P0843 2014 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 2014 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 480

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 2014 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 2014 Chevrolet Silverado - Transmission Fluid Pressure Switch 1 Circuit High Voltage - AutoCodes.com — P0843 2014 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 1 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0843 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P0843 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0843 2014 Chevrolet Silverado Code

1. What does OBDII code P0843 mean on a 2014 Chevrolet Silverado?

Code P0843 indicates that the Transmission Fluid Pressure Switch 1 Circuit is experiencing high voltage, which may signal an issue with the transmission fluid pressure sensor or its circuit.

2. What are the common symptoms of code P0843 in a 2014 Silverado?

Symptoms may include erratic shifting, transmission slipping, poor acceleration, or the transmission entering limp mode.

3. What causes code P0843 in a 2014 Chevrolet Silverado?

Common causes include a faulty transmission fluid pressure sensor, wiring issues such as damaged or corroded connectors, or an issue with the transmission control module (TCM).

4. Can driving with code P0843 cause damage to my Silverado's transmission?

Yes, driving with this code for an extended period may lead to further transmission damage due to improper fluid pressure regulation.

5. How do I diagnose code P0843 in a 2014 Chevrolet Silverado?

Start by inspecting the wiring and connectors for damage or corrosion, then test the transmission fluid pressure sensor for proper operation. Use a scan tool to check the voltage readings from the sensor.

6. How can I fix code P0843 on a 2014 Silverado?

Repairs may include replacing the transmission fluid pressure sensor, repairing or replacing damaged wiring or connectors, and updating or replacing the transmission control module if needed.

7. Is replacing the transmission fluid pressure sensor a DIY repair?

Replacing the sensor can be a DIY repair for those with basic automotive knowledge, but it may require specialized tools and access to the transmission, so professional assistance is recommended.

8. How much does it cost to repair code P0843 on a 2014 Chevrolet Silverado?

The repair cost can range from $150 to $400 depending on whether the issue is with the sensor, wiring, or transmission control module.

9. Can low transmission fluid cause code P0843?

While low fluid typically triggers other codes, it can indirectly affect fluid pressure readings and exacerbate issues. Always check and maintain proper fluid levels.

10. Will clearing code P0843 from the computer solve the problem?

Clearing the code will not fix the underlying issue. The problem must be diagnosed and repaired to prevent the code from returning.