C1938 Code - Malfunction In Front Active Stabilizer Control ECU Short Relay Power Supply IC
Quick Answer
The Front Active Stabilizer Control ECU consists of a metal board, control board, power source IC, step-up circuit, Electrically Erasable Programmable Read-Only Memory (EEPROM), and other parts. Common causes include Faulty Front Active Stabilizer Control ECU, Faulty Front Active Stabilizer Relay, Faulty Rear Active Stabilizer Relay. 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
- C1938 indicates Malfunction In Front Active Stabilizer Control ECU Short Relay Power Supply IC.
- Common causes
- Common causes include Faulty Front Active Stabilizer Control ECU, Faulty Front Active Stabilizer Relay, Faulty Rear Active Stabilizer Relay.
- 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 C1938 Description
What are the Possible Causes of the DTC C1938?
- Faulty Front Active Stabilizer Control ECU
- Faulty Front Active Stabilizer Relay
- Faulty Rear Active Stabilizer Relay
- Front Active Stabilizer Control ECU harness is open or shorted
- Front Active Stabilizer Control ECU circuit poor electrical connection
How to Fix the DTC C1938?
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 C1938 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 C1938 code?
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Information for Specific Makes
- C1938 Lexus — Malfunction In Front Active Stabilizer Control ECU Short Relay Power Supply IC
- C1938 Toyota — Malfunction In Front Active Stabilizer Control ECU Short Relay Power Supply IC
Frequently Asked Questions about C1938 Code
1. What does the OBDII code C1938 mean?
C1938 indicates a malfunction in the Front Active Stabilizer Control ECU, specifically related to the Short Relay Power Supply IC.
2. What are the common symptoms of code C1938?
Symptoms may include a warning light on the dashboard, decreased vehicle stability, unusual noises from the suspension, or poor handling during cornering.
3. What causes the C1938 code to appear?
Common causes include a faulty Front Active Stabilizer Control ECU, a shorted or damaged relay, corroded wiring, or a blown fuse in the power supply circuit.
4. Can a bad wiring connection trigger code C1938?
Yes, damaged or corroded wiring in the relay power supply circuit can cause communication issues, triggering this code.
5. How is the C1938 code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the wiring and relay for damage, and test the Front Active Stabilizer Control ECU for proper function.
6. Can I continue driving with the C1938 code active?
Driving is possible but not recommended, as the vehicle's handling and stability may be compromised, increasing the risk of accidents.
7. What repairs are needed to fix code C1938?
Repairs may include replacing a faulty relay, repairing or replacing damaged wiring, or replacing the Front Active Stabilizer Control ECU if necessary.
8. How much does it cost to fix code C1938?
Repair costs vary depending on the issue, but ECU or relay replacements typically range from $200 to $1,000, including parts and labor.
9. Can a blown fuse cause the C1938 code?
Yes, a blown fuse in the power supply circuit can disrupt the relay's operation, triggering this error code.
10. How can I prevent code C1938 from occurring again?
Regularly inspect and maintain your vehicle's wiring, relays, and fuses, and address any suspension-related issues promptly to prevent future problems.
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