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C0242 ABS / Traction
PCM Indicated Traction Control Malfunction (GM)
C0242 indicates the PCM has reported a traction control malfunction to the ABS/EBCM on GM vehicles. It often points to an engine-side issue that prevents proper traction control operation.
🚗 Yes, but traction control may be disabled, so scan for engine codes as well.
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🎯 Top Causes, Ranked by Likelihood
#1 Active powertrain (engine) code $0-$800
A stored engine code prevents traction control operation.
#2 Communication fault $50-$400
Lost data between the PCM and the EBCM.
#3 Throttle or engine control fault $100-$600
An engine control problem that limits torque control.
#4 Module fault $300-$1000
An internal PCM or EBCM fault sets the code.
🩺 Common Symptoms Traction control light on Check engine light may be on Reduced or altered engine response Traction control disabled 💰 Repair Cost: DIY vs Shop
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🔧 How to Diagnose C0242 1 Scan both engine and ABS/EBCM codes
2 Diagnose and repair active powertrain codes first
3 Check PCM to EBCM communication
4 Clear codes and retest after repairs
❓ Frequently Asked Questions Can I drive with C0242?
Yes, but traction control may be off and there may be an engine issue, so scan for related codes and fix them.
How much to fix C0242?
It depends on the underlying engine fault, from a cheap sensor to several hundred dollars.
What causes C0242 most often?
An active engine control fault that the PCM reports to the traction control system.
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