AutoCodes – Chevrolet – P0843 2015 Chevrolet Silverado

P0843 2015 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 2015 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 518

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2015 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 2015 Chevrolet Silverado - Transmission Fluid Pressure Switch 1 Circuit High Voltage - AutoCodes.com — P0843 2015 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 1 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0843 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P0843 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2015 Chevrolet Silverado Code

What does the OBD-II code P0843 mean on a 2015 Chevrolet Silverado?

P0843 indicates a "Transmission Fluid Pressure Switch 1 Circuit High Voltage," meaning the transmission control module (TCM) has detected an abnormally high voltage in the circuit for the transmission fluid pressure switch.

What are the common symptoms of code P0843 in a 2015 Chevrolet Silverado?

Symptoms may include a check engine light, harsh or erratic shifting, the transmission going into "limp mode," and poor overall transmission performance.

What causes code P0843 to appear on a 2015 Chevrolet Silverado?

Potential causes include a faulty transmission fluid pressure switch, damaged or corroded wiring or connectors in the circuit, low or contaminated transmission fluid, or a malfunctioning TCM.

Can low transmission fluid cause the P0843 code?

Yes, low or contaminated transmission fluid can cause improper pressure readings, which may trigger the P0843 code.

How do you diagnose the P0843 code on a 2015 Chevrolet Silverado?

Diagnosis involves checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, testing the transmission fluid pressure switch, and verifying circuit voltage using a multimeter.

Is it safe to drive a 2015 Chevrolet Silverado with the P0843 code?

Driving with this code is not recommended, as it can lead to further transmission issues or failure. Address the issue promptly to avoid more costly repairs.

How do you fix the P0843 code on a 2015 Chevrolet Silverado?

Repairs may include replacing the transmission fluid pressure switch, repairing or replacing damaged wiring or connectors, flushing and refilling the transmission fluid, or reprogramming the TCM if necessary.

What tools are needed to troubleshoot the P0843 code?

Common tools include a diagnostic scan tool, a multimeter for electrical testing, and basic hand tools for accessing and repairing components.

Can a software issue cause the P0843 code on a 2015 Chevrolet Silverado?

Yes, a software issue in the TCM could potentially cause the code. In such cases, reprogramming the TCM or updating its software may resolve the problem.

What is the cost to repair a P0843 code on a 2015 Chevrolet Silverado?

The cost depends on the root cause but typically ranges from $100 to $500, including labor, with transmission fluid pressure switch replacement being one of the more common fixes.