C2303 Code - Short In Power Source Relay Circuit
Quick Answer
The integration relay is activated by output voltage from the Transmission Control ECU and supplies power to the shift control actuator (parking lock motor). Common causes include Faulty Transmission Control ECU Assembly, Transmission Control ECU harness is open or shorted, Transmission Control ECU 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
- C2303 indicates Short In Power Source Relay Circuit.
- Common causes
- Common causes include Faulty Transmission Control ECU Assembly, Transmission Control ECU harness is open or shorted, Transmission Control ECU 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.
Code C2303 Description
What are the Possible Causes of the DTC C2303?
- Faulty Transmission Control ECU Assembly
- Transmission Control ECU harness is open or shorted
- Transmission Control ECU circuit poor electrical connection
How to Fix the DTC C2303?
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 C2303 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 C2303 code?
Need more information on how to fix the C2303 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C2303 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- C2303 Jaguar — Reservoir Plausibility Error
- C2303 Lexus — Short In Power Source Relay Circuit
- C2303 Toyota — Short In Power Source Relay Circuit
Frequently Asked Questions about C2303 Code
1. What does OBDII code C2303 mean?
C2303 indicates a short circuit in the power source relay circuit, which affects the electrical supply to certain vehicle systems.
2. What are the common symptoms of code C2303?
Symptoms may include malfunctioning electrical components, difficulty starting the vehicle, or illuminated warning lights on the dashboard.
3. What causes code C2303 to appear?
Common causes include damaged wiring, a faulty power source relay, corroded electrical connections, or a short circuit in the relay circuit.
4. Can code C2303 cause drivability issues?
Yes, depending on the affected systems, it may lead to poor performance, electrical malfunctions, or even prevent the vehicle from starting.
5. How do you diagnose code C2303?
Diagnosis involves inspecting the power source relay, checking the wiring and connectors for damage or corrosion, and testing the circuit for shorts or continuity issues.
6. Can I drive with code C2303 active?
It’s not recommended, as electrical malfunctions caused by this issue may lead to safety concerns or further damage to vehicle systems.
7. How do you fix code C2303?
Repairs may include replacing the power source relay, repairing or replacing damaged wiring, and cleaning or securing corroded or loose connections.
8. How much does it cost to fix code C2303?
Repair costs can vary depending on the extent of the wiring damage or the need to replace the power source relay, typically ranging from $50 to $200.
9. Can a blown fuse cause code C2303?
A blown fuse may be a symptom rather than a cause but should be inspected, as it could indicate an underlying short circuit in the relay circuit.
10. Will clearing the code fix the problem?
Clearing the code without addressing the underlying issue will not resolve the problem, and the code is likely to return.
Discuss the causes and fixes for C2303 OBDII Code
Code C2303 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
