AutoCodes – Generic – C2304

C2304 Code - Open Or Short Circuit In U Phase

Quick Answer

The Shift Control Actuator consists of the parking lock motor and the rotation angle sensor. Common causes include Faulty Auxiliary Battery, Faulty Transmission Control ECU Assembly, Faulty Shift Control Actuator. 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: C2304 indicates Open Or Short Circuit In U Phase.
Common causes: Common causes include Faulty Auxiliary Battery, Faulty Transmission Control ECU Assembly, Faulty Shift Control Actuator.
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 2,090

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C2304 Description

The Shift Control Actuator consists of the parking lock motor and the rotation angle sensor. The Transmission Control ECU receives a P position switch signal from the Power Management Control ECU (HV CPU) and activates the parking lock motor by controlling current, causing the parking lock mechanism to switch. The Transmission Control ECU outputs these DTCs when it detects a malfunction in the parking lock motor system.

OBDII Code C2304 - Open Or Short Circuit In U Phase - AutoCodes.com — C2304 Code - Open Or Short Circuit In U Phase

What does this mean?

What are the Possible Causes of the DTC C2304?

Faulty Auxiliary Battery
Faulty Transmission Control ECU Assembly
Faulty Shift Control Actuator
Shift Control Actuator harness is open or shorted
Shift Control Actuator circuit poor electrical connection

How to Fix the DTC C2304?

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 C2304 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 C2304 code?

Need more information on how to fix the C2304 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C2304 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C2304 Jaguar — Damper Actuator Supply Circuit Fault
C2304 Lexus — Open Or Short Circuit In U Phase
C2304 Toyota — Open Or Short Circuit In U Phase

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 C2304 Code

1. What are the common symptoms of OBDII code C2304 (Open or Short Circuit in U Phase)?

The common symptoms of OBDII code C2304 include issues with power steering functionality, ABS warning lights illuminated on the dashboard, and potential loss of power steering assist.

2. What are some possible causes of OBDII code C2304?

Possible causes of OBDII code C2304 include damaged wiring in the U phase circuit, loose connections, faulty power steering control module, or a malfunctioning ABS module.

3. How can I diagnose the cause of OBDII code C2304?

Diagnosing OBDII code C2304 involves inspecting the wiring in the U phase circuit for any signs of damage, checking for loose connections, and using a diagnostic tool to scan the power steering and ABS modules for faults.

4. Can I still drive my vehicle with OBDII code C2304?

It is not recommended to drive your vehicle with OBDII code C2304, as it can lead to potential safety risks due to the loss of power steering assist and compromised ABS functionality.

5. How can I repair OBDII code C2304?

Repairing OBDII code C2304 may involve repairing or replacing damaged wiring in the U phase circuit, securing loose connections, and addressing any faults in the power steering or ABS modules as necessary.

6. Is it possible to reset OBDII code C2304 without fixing the underlying issue?

Resetting OBDII code C2304 without fixing the underlying issue will likely result in the code reappearing once the problem is detected again by the vehicle's systems.

7. Can a DIY enthusiast fix OBDII code C2304 at home?

While some aspects of diagnosing and repairing OBDII code C2304 may be possible for a DIY enthusiast, it is recommended to seek professional assistance due to the complexity of the electrical systems involved.

8. How much does it cost to repair OBDII code C2304 at a mechanic?

The cost of repairing OBDII code C2304 at a mechanic can vary depending on the extent of the issue, the labor rates, and the cost of any replacement parts that may be required.

9. Are there any preventive measures to avoid OBDII code C2304 in the future?

To help prevent OBDII code C2304 from occurring in the future, regular maintenance checks, avoiding water exposure to electrical components, and ensuring proper wiring connections can all be beneficial.

10. Can OBDII code C2304 be related to other electrical issues in the vehicle?

OBDII code C2304 can be related to other electrical issues in the vehicle, especially if there is a broader underlying problem with the electrical system that is affecting multiple components.