GMC Code C0240: Meaning, Causes & How to Fix It
On GM vehicles, code C0240 means the Powertrain Control Module instructed the Electronic Brake Control Module to disable traction control due to an engine-side fault — it's a secondary status code reflecting an issue elsewhere rather than a standalone traction control problem.
Jump to a section: What C0240 means · The throttle body connection · Related wheel speed codes · How it's diagnosed · Quick reference table · FAQ
What C0240 Means
Rather than reflecting a fault in the traction control hardware itself, C0240 shows up when the PCM tells the EBCM to stand down traction control because of a detected engine-side issue. This makes it important to look at engine-related codes appearing alongside it rather than focusing on the ABS/traction system alone.
The Throttle Body Connection
A faulty electronic throttle body assembly is a very commonly reported trigger for this code on GM vehicles, since the PCM relies on accurate throttle position data as part of managing traction control interventions. If a throttle-related code (such as one involving throttle actuator control) appears alongside C0240, that's the more likely primary issue to address.
Related Wheel Speed Codes
A wheel speed sensor fault elsewhere in the system (such as a right front wheel speed sensor circuit code) can also cause the PCM to disable traction control as a downstream effect, with C0240 logged as the secondary status code reflecting that shutdown.
How It's Diagnosed
Rather than treating C0240 as the primary fault, scan for every code present and address the underlying engine or wheel speed sensor issue first; C0240 itself should clear once the root cause driving the traction control shutdown is resolved.
Quick Reference Table
| Code Found Alongside C0240 | Likely Root Cause | What To Do |
|---|---|---|
| Throttle actuator control code | Faulty electronic throttle body | Diagnose and repair throttle body |
| Wheel speed sensor circuit code | Failed wheel speed sensor | Replace affected sensor |
| No other codes present | Less common; broader PCM issue | Full diagnostic scan recommended |
| Any of the above | N/A | Address root cause; C0240 should clear |
Frequently Asked Questions
Should I focus on fixing C0240 directly?
No — it's a secondary status code reflecting a decision made elsewhere in the system, so identifying and fixing the actual triggering code (often throttle- or wheel-speed-related) is the correct approach.
Is it safe to drive with traction control disabled?
You can drive, but without traction control assistance, which is worth being cautious about in wet, icy, or otherwise slippery conditions until the underlying issue is resolved.
Will clearing C0240 alone fix anything?
No — since it's triggered by another fault, clearing just this code without addressing the root cause will simply result in the same code returning once the triggering condition is detected again.
Does a throttle body fault always cause C0240?
Not always, but it's one of the more commonly reported causes on GM vehicles specifically, which is why checking for a throttle-related code alongside C0240 is a reasonable first diagnostic step.
Shop the Parts Mentioned
- Bidirectional Scanner — identifies the primary code triggering the traction control shutdown.
- Wireless Scanner — checks for related throttle and wheel speed codes.
- 95-Piece Mechanics Tool Set (Metric & SAE) — for throttle body and sensor access.
- 5-Piece Pro Electric Wrench Kit — speeds up throttle body removal for cleaning or inspection.
- Taylor Battery Cable Terminal Kits — addresses connection issues contributing to sensor faults.