Chassis, generic

C0246 ABS/TCS Control Module Internal Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

On GM vehicles wheel speed message from the brake module missing on the CAN bus
On Toyota 4Runner unstable ECU ground caused by aftermarket LED or HID headlight bulbs
Damaged brake module connector or ground wires

Symptoms

  • ABS warning lamp on
  • Functions that use wheel speed run degraded in other modules (GM)

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–900
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

abs control modulecommunication busground strap

Related codes

C0035C0045U0121C0110

References: saabwisonline.com, static.nhtsa.gov, saabwisonline.com.