C1377 Code - Capacitor Malfunction
Quick Answer
The Brake Control Power Supply Assembly (Capacitor) provides auxiliary power for brake control when an auxiliary battery (12 V) voltage drops. Common causes include Faulty Brake Control Power Supply Assembly (Capacitor), Brake Control Power Supply Assembly harness is open or shorted, Brake Control Power Supply Assembly 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
- C1377 indicates Capacitor Malfunction.
- Common causes
- Common causes include Faulty Brake Control Power Supply Assembly (Capacitor), Brake Control Power Supply Assembly harness is open or shorted, Brake Control Power Supply Assembly 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 C1377 Description
What are the Possible Causes of the DTC C1377?
- Faulty Brake Control Power Supply Assembly (Capacitor)
- Brake Control Power Supply Assembly harness is open or shorted
- Brake Control Power Supply Assembly circuit poor electrical connection
How to Fix the DTC C1377?
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 C1377 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 C1377 code?
Need more information on how to fix the C1377 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1377 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- C1377 Lexus — Capacitor Malfunction
- C1377 Toyota — Capacitor Malfunction
Frequently Asked Questions about C1377 Code
1. What are the common symptoms of OBDII code C1377 (Capacitor Malfunction)?
- Common symptoms include rough idling, engine misfires, poor acceleration, and illuminated Check Engine light.
2. What can cause the OBDII code C1377 to trigger?
- The code C1377 is triggered by a malfunction in the capacitor within the ignition coil, which can be caused by electrical issues or component wear.
3. How serious is the OBDII code C1377 (Capacitor Malfunction)?
- While the vehicle may still be operable with this code, it is important to address it promptly to prevent potential damage to the ignition system.
4. Can I drive my vehicle with the OBDII code C1377 active?
- It is generally not recommended to drive with an active C1377 code, as it can lead to decreased performance and potential long-term damage to the ignition system.
5. How can I diagnose and repair OBDII code C1377?
- Diagnosis typically involves testing the ignition coil and associated components, such as the capacitor, wiring, and connectors. Repair may involve replacing the faulty ignition coil or capacitor.
6. Is it possible to reset the OBDII code C1377 without fixing the issue?
- While clearing the code may temporarily turn off the Check Engine light, it will not resolve the underlying issue causing the capacitor malfunction.
7. Are there any DIY repair tips for fixing OBDII code C1377?
- DIY repair for this code may involve checking and cleaning electrical connections, replacing the ignition coil, or seeking assistance from a professional mechanic for a thorough diagnosis.
8. How much does it cost to repair OBDII code C1377?
- The cost of repairing the C1377 code can vary depending on the extent of the issue, parts needed, and labor rates. It is advisable to obtain quotes from different repair shops.
9. Can a bad capacitor cause other OBDII codes to appear?
- A malfunctioning capacitor can potentially cause other related codes to appear, especially if it affects the performance of the ignition system or engine.
10. How can I prevent OBDII code C1377 from recurring in the future?
- Regular maintenance, such as checking and replacing ignition components as recommended by the manufacturer, can help prevent the recurrence of the C1377 code.
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