C1378 Lexus Code - Capacitor Communication Circuit 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 Skid Control ECU, Skid Control ECU harness is open or shorted, Skid 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
- C1378 Lexus indicates Capacitor Communication Circuit Malfunction.
- Common causes
- Common causes include Faulty Skid Control ECU, Skid Control ECU harness is open or shorted, Skid 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 C1378 Lexus Description
What are the Possible Causes of the DTC C1378 Lexus?
- Faulty Skid Control ECU
- Skid Control ECU harness is open or shorted
- Skid Control ECU circuit poor electrical connection
How to Fix the DTC C1378 Lexus?
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 C1378 Lexus 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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Frequently Asked Questions about C1378 Lexus Code
1. What does the OBDII code C1378 mean for a Lexus?
C1378 indicates a malfunction in the capacitor communication circuit, which is part of the brake control system.
2. What are the common symptoms of code C1378 on a Lexus?
Symptoms may include the ABS warning light or brake system warning light turning on and reduced or erratic brake performance.
3. What causes the C1378 code to appear on a Lexus?
Common causes include faulty capacitors, damaged wiring or connectors in the capacitor communication circuit, or issues with the brake control ECU.
4. Can I drive my Lexus with the C1378 code active?
It’s not recommended, as the brake system may not function properly, posing safety risks.
5. How is the C1378 code diagnosed?
A technician will use a scan tool to confirm the code, inspect the capacitor communication circuit, check for damaged wiring, and test the brake control ECU.
6. What repairs can fix the C1378 code on a Lexus?
Repairs may include replacing a faulty capacitor, repairing or replacing damaged wiring, or replacing the brake control ECU if necessary.
7. How much does it cost to repair the C1378 code on a Lexus?
Repair costs depend on the exact issue but typically range from $200 to $1,000, depending on parts and labor.
8. Can a dead battery cause the C1378 code?
A weak or dead battery can sometimes contribute to communication circuit issues, so checking the battery health is a good first step.
9. How can I prevent the C1378 code from reoccurring?
Regular maintenance of the brake system and periodic checks of the electrical connections can help prevent this code from reappearing.
10. Does the C1378 code require reprogramming the ECU?
In most cases, reprogramming is not necessary, but if the ECU is replaced, it may require calibration or programming to match the vehicle.
Discuss the causes and fixes for C1378 Lexus OBDII Code
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