AutoCodes – Chevrolet – P0989 2018 Chevrolet Silverado

P0989 2018 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 5 Circuit Low Voltage

Quick Answer

The Transmission Fluid Pressure (TFP) switch 5 is part of the Transmission 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: P0989 2018 Chevrolet Silverado indicates Transmission Fluid Pressure Switch 5 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 923

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 Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0989 2018 Chevrolet Silverado Description

The Transmission Fluid Pressure (TFP) switch 5 is part of the Transmission Control Solenoid Valve Assembly, which has no serviceable parts. The Transmission Control Module (TCM) supplies a signal circuit to the TFP switch 5. The TFP switch 5 has an internal case ground. TFP switch 5 is normally closed or LOW. When oil pressure is present at the TFP switch 5, the switch is open or HIGH. The normally high pressure control (PC) solenoid 3 controls pressure to the R1/4-5-6 clutch regular valve. The TCM monitors the TFP switch 5 signal circuit to determine the position of the R1/4-5-6 clutch regulator valve. When the low and reverse clutch and 4-5-6 clutch are commanded OFF, pressure is present on the TFP switch 5. When the low and reverse clutch or the 4-5-6 clutch is commanded ON, the R1/4-5-6 clutch regulator valve moves and pressure to the TFP switch 5 is exhausted through the R1/4-5-6 clutch regulator valve. The Diagnostic Trouble Code (DTC) will be set when the TCM detects that the TFP switch 5 signal voltage remains LOW after the 4-5-6 clutch transitions from a HIGH pressure state to a LOW pressure state. The TCM counts each incident. The DTC sets when 18 counts are accumulated.

OBDII Code P0989 2018 Chevrolet Silverado - Transmission Fluid Pressure Switch 5 Circuit Low Voltage - AutoCodes.com — P0989 2018 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 5 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0989 2018 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 P0989 2018 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 P0989 2018 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 P0989 2018 Chevrolet Silverado code?

Need more information on how to fix the P0989 2018 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 P0989 2018 Chevrolet Silverado Code

1. What does the OBDII code P0989 mean on a 2018 Chevrolet Silverado?

P0989 indicates a "Transmission Fluid Pressure Switch 5 Circuit Low Voltage," meaning the transmission control module (TCM) has detected a low voltage signal from the pressure switch 5 circuit.

2. What are the common symptoms of a P0989 code in a 2018 Silverado?

Symptoms may include harsh or delayed shifting, the transmission stuck in one gear, poor fuel economy, or the activation of the check engine light.

3. What causes the P0989 code in a 2018 Chevrolet Silverado?

Common causes include a faulty transmission fluid pressure switch, damaged wiring or connectors in the pressure switch circuit, low transmission fluid, or an issue with the TCM.

4. Can driving with a P0989 code damage my Silverado's transmission?

Yes, driving with this code can lead to transmission wear and tear if the shifting issues persist, so itâ€™s best to address the problem promptly.

5. How can I diagnose the P0989 code on my Silverado?

Start by inspecting the wiring and connectors for damage, checking the transmission fluid level, and testing the transmission fluid pressure switch with a multimeter.

6. How do I fix the P0989 code on a 2018 Chevrolet Silverado?

Repairs may include replacing the transmission fluid pressure switch, repairing or replacing damaged wiring, topping off or changing the transmission fluid, or reprogramming the TCM.

7. Is the P0989 code covered under warranty on my 2018 Silverado?

It depends on your vehicle's warranty terms, but powertrain warranties often cover transmission-related issues, so check with your dealer.

8. Can low transmission fluid cause the P0989 code?

Yes, low or dirty transmission fluid can affect pressure readings and trigger this code, so verifying fluid levels is an important first step.

9. How much does it cost to fix a P0989 code on a Silverado?

Repairs can range from $100 to $500 or more, depending on whether you need to replace the pressure switch, repair wiring, or address other underlying issues.

10. Can I clear the P0989 code without fixing the problem?

Clearing the code without fixing the issue may temporarily turn off the check engine light, but the problem will likely return and could lead to further damage.