AutoCodes – Chevrolet – P0842 2015 Chevrolet Silverado

P0842 2015 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 1 Circuit Low 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: P0842 2015 Chevrolet Silverado indicates Transmission Fluid Pressure Switch 1 Circuit Low 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 552

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 P0842 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 LOW after the 3-5-R clutch transitions from a HIGH pressure state to a LOW pressure state. The TCM counts each incident. The DTC sets when 25 counts are accumulated.

OBDII Code P0842 2015 Chevrolet Silverado - Transmission Fluid Pressure Switch 1 Circuit Low Voltage - AutoCodes.com — P0842 2015 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0842 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 P0842 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 P0842 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 P0842 2015 Chevrolet Silverado code?

Need more information on how to fix the P0842 2015 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 P0842 2015 Chevrolet Silverado Code

1. What does the OBDII code P0842 mean on a 2015 Chevrolet Silverado?

P0842 indicates "Transmission Fluid Pressure Switch 1 Circuit Low Voltage," meaning the transmission control module (TCM) has detected a low voltage signal from the fluid pressure switch.

2. What are the common symptoms of code P0842 in a 2015 Chevrolet Silverado?

Symptoms may include slipping gears, harsh shifting, delayed engagement, the transmission stuck in limp mode, and the check engine light turning on.

3. What causes the P0842 code to appear on a 2015 Chevrolet Silverado?

Common causes include a faulty transmission fluid pressure sensor, damaged wiring or connectors, low or dirty transmission fluid, or internal transmission issues.

4. Can low or dirty transmission fluid trigger the P0842 code in a 2015 Chevrolet Silverado?

Yes, low or contaminated transmission fluid can cause incorrect pressure readings and trigger the P0842 code.

5. How do you diagnose the P0842 code in a 2015 Chevrolet Silverado?

Diagnosis involves scanning for codes, inspecting the transmission fluid level and condition, checking the wiring and connectors for damage, and testing the transmission pressure sensor for proper operation.

6. Can I continue driving my 2015 Chevrolet Silverado with the P0842 code?

Driving with the P0842 code is not recommended, as it may lead to further damage to the transmission or unsafe driving conditions.

7. How is the P0842 code fixed on a 2015 Chevrolet Silverado?

Repairs may include replacing the transmission fluid pressure sensor, repairing or replacing damaged wiring and connectors, or flushing and refilling the transmission fluid.

8. How much does it cost to repair the P0842 code on a 2015 Chevrolet Silverado?

Repair costs vary but typically range from $100 to $300 for sensor replacement, while more extensive transmission repairs may cost significantly more.

9. Can a bad transmission control module (TCM) cause the P0842 code in a 2015 Chevrolet Silverado?

While rare, a malfunctioning TCM could cause the P0842 code if it fails to properly interpret sensor signals.

10. How can I prevent the P0842 code from recurring in my 2015 Chevrolet Silverado?

Regularly check and change the transmission fluid, inspect wiring and connectors for damage, and address transmission issues promptly to prevent recurrences.