AutoCodes – Chevrolet – P0989 2017 Chevrolet Silverado

P0989 2017 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 2017 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 378

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
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Code P0989 2017 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 2017 Chevrolet Silverado - Transmission Fluid Pressure Switch 5 Circuit Low Voltage - AutoCodes.com — P0989 2017 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 5 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0989 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 P0989 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 P0989 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 P0989 2017 Chevrolet Silverado code?

Need more information on how to fix the P0989 2017 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 2017 Chevrolet Silverado Code

What does OBDII code P0989 mean on a 2017 Chevrolet Silverado?

Code P0989 indicates a low voltage issue in the Transmission Fluid Pressure Switch 5 Circuit, which monitors hydraulic pressure in the transmission.

What are the common symptoms of code P0989?

Symptoms may include harsh or delayed shifting, transmission slipping, the check engine light turning on, and reduced fuel efficiency.

What causes the P0989 code to appear?

Common causes include a faulty transmission fluid pressure switch, damaged wiring or connectors in the circuit, low transmission fluid, or issues with the transmission control module (TCM).

Can driving with code P0989 damage my 2017 Silverado?

Driving with this code may worsen transmission performance and potentially lead to further damage if left unresolved.

How do I diagnose the P0989 code?

Start by checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and testing the transmission fluid pressure switch and related circuits.

Can low transmission fluid trigger the P0989 code?

Yes, low or contaminated transmission fluid can cause incorrect pressure readings, potentially triggering the code.

How do I fix the P0989 code on my Silverado?

Possible fixes include replacing the transmission fluid pressure switch, repairing or replacing damaged wiring or connectors, or addressing low or contaminated transmission fluid.

How much does it cost to repair a P0989 code?

Repair costs can vary, ranging from $100 to $400 for parts and labor, depending on whether the issue is with the switch, wiring, or other related components.

How can I prevent code P0989 from recurring?

Regularly check and maintain your transmission fluid, inspect wiring for wear, and address transmission issues promptly to prevent recurrence.

Do I need to reprogram the TCM after fixing the P0989 code?

Reprogramming the TCM is usually not necessary, but clearing the code with a scan tool and performing a test drive to confirm the repair is recommended.