C0242Manufacturer-specific code

C0242 Code: Engine Computer Indicates a Fault That Disables Traction Control

The C0242 code means the engine computer warned the ABS module about a fault of its own, so the traction control is disabled. The real problem is in the engine, not in the ABS.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$0 to $1,000
Difficulty
Medium
System
Chassis, Brakes and Suspension
Applies to
Depends on the manufacturer

Updated Reviewed by Renzo Chacca

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What the C0242 code means

The ABS module (EBCM) controls the anti-lock brakes and, on most modern vehicles, traction control and stability control too. When it detects a fault, it disables those functions and turns on the ABS and stability warning lights. The normal brakes keep working.

Traction control needs to reduce engine torque in order to work. If the engine computer has a fault (for example, with the electronic throttle or misfires), it informs the ABS, and the ABS disables the traction control and stores the C0242 code.

Read the engine computer codes: resolving them makes the C0242 code go away.

Important: many C and B codes are not generic. The definition on this page is the most widespread one, used by General Motors and most generic scan tools, but on other makes the same number can mean something else. Always confirm the code text with a scan tool that reads the right module (ABS, body or airbag).

This is a "consequence" code, so do not look for the fault in the ABS. Fix the engine P codes first (for example, the electronic throttle, misfires or position sensors) and then clear the ABS codes.

C0242 code symptoms

  • Traction control and check engine warning lights on.

Likely causes of the C0242 code

  1. Engine computer codes. This is the real cause.
  2. Communication between the engine and the ABS. A fault in the CAN network between the two modules.

How to diagnose the C0242 code step by step

  1. Read and repair the engine codes.
  2. Clear the ABS codes after the repair.

How to fix the C0242 code

  • Repair the engine fault.
  • Clear the codes in both modules.

Technical reference data

  • Traction control depends on the engine computer.
  • These values are approximate. Check the manufacturer data for your vehicle.

Brand-specific notes

Always scan every module, not only the ABS. The engine code that triggered this one is the one that tells you what to repair.

C0242 on GM and Chevrolet

This code is very common on GM and Chevrolet vehicles, together with P codes.

Frequently asked questions about C0242

What does the C0242 code mean?
It means the traction control is disabled because of a fault in the engine computer.
Where is the fault?
In the engine computer, not in the ABS.
Can I drive with a C0242 code?
It depends on the engine fault. Read the engine codes to know how serious the underlying problem is.
How much does it cost to fix C0242?
It depends on the engine fault, from $0 up to about $1,000.
Will a C0242 code clear itself?
It goes away once the engine fault is repaired and the codes are cleared. While the engine problem remains, the traction control stays off.

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Questions about the C0242 code

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