C1242 Toyota Code - IG2 Power Source Circuit
Quick Answer
If there is a problem with the Master Cylinder Solenoid (Skid Control ECU) power supply circuit, the skid control ECU outputs the DTC and prohibits operation under the fail-safe function. Common causes include Faulty Battery, Charging System, Faulty Master Cylinder Solenoid (Skid Control ECU). 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
- C1242 Toyota indicates IG2 Power Source Circuit.
- Common causes
- Common causes include Faulty Battery, Charging System, Faulty Master Cylinder Solenoid (Skid Control ECU).
- 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 C1242 Toyota Description
If the voltage supplied to terminal IG2 is not within the DTC detection threshold due to malfunctions in parts such as the battery and generator circuit, this DTC is stored.
What are the Possible Causes of the DTC C1242 Toyota?
- Faulty Battery
- Charging System
- Faulty Master Cylinder Solenoid (Skid Control ECU)
How to Fix the DTC C1242 Toyota?
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 C1242 Toyota 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 C1242 Toyota code?
Need more information on how to fix the C1242 Toyota code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1242 Toyota code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C1242 Toyota Code
1. What does the OBDII code C1242 for Toyota's IG2 Power Source Circuit indicate?
The code C1242 signifies a malfunction in the IG2 power source circuit of your Toyota vehicle.
2. What are some common symptoms of a C1242 code in a Toyota?
Common symptoms of a C1242 code may include issues with starting the vehicle, illumination of the check engine light, and electrical failures in various systems.
3. What are possible causes of the C1242 code in a Toyota?
Potential causes of the C1242 code in a Toyota include a faulty ignition switch, damaged wiring or connectors in the IG2 circuit, or a malfunctioning power source control module.
4. How can I diagnose the source of a C1242 code in my Toyota?
Diagnosing a C1242 code may involve conducting a thorough inspection of the ignition system components, checking the wiring for any visible damage, and using a multimeter to test the voltage in the IG2 circuit.
5. Can I drive my Toyota with a C1242 code?
It is not recommended to drive your Toyota with a C1242 code as it can lead to potential electrical malfunctions and affect the overall performance and safety of your vehicle.
6. How can I repair a C1242 code in my Toyota?
Repairing a C1242 code may involve replacing a faulty ignition switch, repairing or replacing damaged wiring or connectors, or addressing any issues with the power source control module.
7. Is it necessary to reset the OBDII code after fixing a C1242 issue in a Toyota?
Yes, it is important to clear the OBDII code after resolving a C1242 problem in your Toyota to reset the check engine light and ensure that the issue has been successfully addressed.
8. Can a DIY enthusiast fix a C1242 code in a Toyota?
While some aspects of diagnosing and repairing a C1242 code may be manageable for DIY enthusiasts with experience in automotive repairs, complex electrical issues may require professional assistance.
9. How much does it typically cost to repair a C1242 code in a Toyota?
The cost of repairing a C1242 code in a Toyota can vary depending on the specific cause of the issue, labor rates in your area, and whether genuine Toyota parts are needed for the repair.
10. How can I prevent the recurrence of a C1242 code in my Toyota?
To prevent the recurrence of a C1242 code, it is important to perform regular maintenance checks on the ignition system, keep the wiring and connectors in good condition, and address any electrical issues promptly.
Discuss the causes and fixes for C1242 Toyota OBDII Code
-
Can I replace the solenoid myself on this Prius? Is it easy to get to the area, where it resides?
-
The C1242 code on a Prius isn’t usually caused by a bad solenoid. It points to a loss of power in the IG2 circuit that feeds the ABS or brake actuator system. Before replacing anything, check the fuses and the IG2 relay, and make sure the 12-volt battery is in good shape—low voltage is a common cause of this code.
If you’re referring to the brake actuator solenoid inside the ABS unit, that’s not a simple DIY job. It requires removing the brake actuator assembly and bleeding the hydraulic system with a scan tool. I’d recommend checking power and grounds first; if those are good and the code persists, have the actuator checked by a shop before replacing it.
-
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
