C0246 code meaning
ABS/TCS Control Module Internal Performance
What C0246 means
The accessible J2012 tables lack C0246, and an internal brake module fault is not what any maker uses it for. Two makers use it differently. In the 2011 Saab 9-5 (GM) it is set by other modules on the fast CAN network when the periodic wheel speed message from the brake module stops arriving: Invalid Data Received From Electronic Brake Control Module. Toyota stores it in the skid control ECU of the 2014 to 2020 4Runner together with C0226, C0236 and C0256; Tech Tip T-TT-0597-20 traces the ABS lamp to a ground that fluctuates when aftermarket LED or HID headlight bulbs are fitted. The meaning therefore depends on make and on which module holds the code. On GM, start with the wheel speed sensors.
C0246 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0246
- ABS warning lamp on
- Functions that use wheel speed run degraded in other modules (GM)
Common causes of C0246
- PossibleOn GM vehicles wheel speed message from the brake module missing on the CAN bus
- PossibleOn Toyota 4Runner unstable ECU ground caused by aftermarket LED or HID headlight bulbs
- Less likelyDamaged brake module connector or ground wires
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
ABS control moduleCommunication busGround strap
What each part of C0246 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 46 | The exact fault in that area. |
What to do next
- Note C0246 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0246
What does C0246 mean?
C0246 means "ABS/TCS Control Module Internal Performance". The accessible J2012 tables lack C0246, and an internal brake module fault is not what any maker uses it for. It is a generic code, so it means the same on every make.
Is it safe to drive with C0246?
Drive gently and only to a workshop. With C0246 the car can go into limp mode (reduced power) to protect itself.
Will C0246 fail an emissions test?
C0246 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0246 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will C0246 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.