AutoCodes – Acura – P0979 Acura

P0979 Acura Code - Shift Solenoid Valve 'C' Short

Quick Answer

When shift solenoid valves A, B, C, D, and E are turned ON, the hydraulic pressure circuit opens. Common causes include Faulty Shift Solenoid 'C', Shift Solenoid 'C' harness is open or shorted, Shift Solenoid 'C' circuit poor electrical connection. 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: P0979 Acura indicates Shift Solenoid Valve 'C' Short.
Common causes: Common causes include Faulty Shift Solenoid 'C', Shift Solenoid 'C' harness is open or shorted, Shift Solenoid 'C' circuit poor electrical connection.
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 5,827

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 May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0979 Acura Description

When shift solenoid valves A, B, C, D, and E are turned ON, the hydraulic pressure circuit opens. The hydraulic pressure circuit supplies/discharges hydraulic pressure to/from each clutch according to the combination of the ON/OFF status of the shift solenoid valves. The Powertrain Control Module (PCM) commands the driver circuit to turn on the shift solenoid valve. The circuit diagnoses malfunctions such as a circuit short or open, and sends back a return signal during the PCM's command. When the return signal does not match the PCM command to turn OFF the shift solenoid valve, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0979 Acura - Shift Solenoid Valve 'C' Short - AutoCodes.com — P0979 Acura Code - Shift Solenoid Valve 'C' Short

What does this mean?

What are the Possible Causes of the DTC P0979 Acura?

Faulty Shift Solenoid 'C'
Shift Solenoid 'C' harness is open or shorted
Shift Solenoid 'C' circuit poor electrical connection

How to Fix the DTC P0979 Acura?

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 P0979 Acura 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.

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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 P0979 Acura Code

1. What does the OBDII code P0979 mean for an Acura?

P0979 indicates a problem with the Shift Solenoid Valve 'C', specifically a short circuit in its electrical system.

2. What are the common symptoms of code P0979?

Symptoms may include erratic or delayed shifting, transmission slipping, poor fuel efficiency, and the Check Engine Light illuminating.

3. What causes the P0979 code on an Acura?

Common causes include damaged wiring or connectors, a faulty shift solenoid valve 'C', transmission fluid contamination, or issues with the transmission control module (TCM).

4. Can driving with code P0979 damage my Acura's transmission?

Yes, prolonged driving with this code can lead to further transmission issues or damage due to improper shifting.

5. How do I diagnose the P0979 code on my Acura?

Start by inspecting the wiring and connectors for damage, checking the transmission fluid condition, and testing the functionality of the shift solenoid valve 'C'.

6. How do I fix code P0979 on an Acura?

Repairs may include replacing the shift solenoid valve 'C', repairing damaged wiring, cleaning or replacing contaminated transmission fluid, or addressing TCM issues.

7. How much does it cost to fix the P0979 code on an Acura?

Depending on the diagnosis, repairs can range from $150 to $500 or more, especially if the solenoid or TCM needs replacement.

8. Can low transmission fluid cause the P0979 code on an Acura?

Yes, low or contaminated transmission fluid can affect solenoid performance and trigger this code.

9. Do I need to reprogram the transmission control module after fixing code P0979?

In some cases, reprogramming the TCM may be necessary if its settings were affected by the fault.

10. Is P0979 a common issue in Acura vehicles?

While not overly common, issues with shift solenoids can occur in older or high-mileage Acura models and should be addressed promptly.

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