My Pro Street

C0246 Code Explained: Causes, Symptoms & Engine Torque Reduction Signal Circuit Fixes

An OBD-II scanner displaying C0246 alongside a CAN bus communication diagram linking the Electronic Brake Control Module and Engine Control Module, with traction control and stability control warning lights illuminated.

If your scan tool displays C0246, your vehicle’s Electronic Brake Control Module (EBCM) has detected a problem with the Engine Torque Reduction Signal Circuit.

Modern vehicles integrate the Anti-lock Braking System (ABS), Traction Control System (TCS), Electronic Stability Control (ESC), and Powertrain Control Module (PCM/ECM). During wheel slip or loss of traction, the EBCM requests that the engine computer temporarily reduce engine torque by limiting throttle opening, retarding ignition timing, or adjusting fuel delivery.

When the EBCM cannot send or receive this torque reduction request correctly, it stores C0246 and may disable traction control and stability control until the fault is repaired.

For additional chassis diagnostics and repair guides, visit our Complete OBD-II Trouble Code Guide:

https://my.prostreetonline.com/dtc-obdii

Quick Facts

ItemInformation
OBD-II CodeC0246
DescriptionEngine Torque Reduction Signal Circuit
CategoryChassis (C) Codes
SystemTraction Control / Electronic Stability Control
Severity★★★☆☆ Moderate
Safe to Drive?Yes, but traction and stability control performance may be reduced
Common CausesCAN communication fault, faulty PCM, failed EBCM, wiring damage, low battery voltage
Typical Repair Cost$100–1,800

What Does C0246 Mean?

The C0246 code indicates the Electronic Brake Control Module (EBCM) has detected an abnormal condition within the Engine Torque Reduction Signal Circuit.

Whenever wheel spin occurs, the traction control system communicates with the engine computer to reduce engine output. Depending on the vehicle, torque reduction may be achieved by:

If the EBCM cannot properly communicate with the PCM or ECM, it stores C0246 and disables traction-related functions to prevent unintended operation.

Symptoms of C0246

Common symptoms include:

Most drivers will notice no engine performance problems during normal driving, although wheel spin may occur more easily on slippery roads.

Common Causes

CAN Bus Communication Problems

The most common cause is interrupted communication between the:

Communication problems may be intermittent or continuous.

Faulty Electronic Brake Control Module

An internal EBCM fault may prevent proper torque reduction requests.

Faulty PCM or ECM

The engine computer may fail to acknowledge or execute torque reduction commands.

Damaged Wiring

Inspect for:

Communication wiring is especially susceptible to vibration-related failures.

Low System Voltage

Weak batteries and charging system problems frequently generate communication-related chassis codes.

CAN Network Fault

Open circuits, shorts, or excessive resistance on the CAN network can interrupt communication between multiple control modules.

How Serious Is C0246?

Moderate.

Normal braking remains unaffected, but several electronic safety systems may no longer function correctly, including:

This becomes more noticeable during rain, snow, or loose road surfaces.

Can You Drive With C0246?

Yes.

The vehicle generally remains safe to operate under normal road conditions.

However:

Repairs should be completed soon to restore all safety systems.

How to Diagnose C0246

1. Scan All Control Modules

Use a professional scan tool capable of communicating with:

Look for related communication (U-series) codes.

2. Check Battery Voltage

Verify:

Low voltage commonly causes module communication faults.

3. Inspect CAN Wiring

Check for:

Pay particular attention to wiring between the EBCM and PCM.

4. Verify Communication

Use live scan data to verify that:

5. Inspect the EBCM

If wiring tests good, inspect the Electronic Brake Control Module for internal faults.

6. Test the PCM

Verify proper PCM operation before replacing expensive control modules.

Common Repairs

RepairEstimated Cost
Repair wiring$100–300
Replace CAN connector$75–200
Battery replacement$150–350
PCM software update$100–250
Replace Electronic Brake Control Module$800–1,800
Replace PCM$900–2,000

Common Diagnostic Mistakes

Common mistakes include:

Vehicles Commonly Affected

C0246 is frequently found on:

Many GM vehicles using StabiliTrak are particularly susceptible to C0246, although similar torque management faults appear on other manufacturers.

How to Prevent C0246

Reduce the likelihood of C0246 by:

Frequently Asked Questions

What causes C0246?

The most common causes include CAN bus communication problems, damaged wiring, a faulty Electronic Brake Control Module, PCM failure, or low system voltage.

Is C0246 dangerous?

Not usually.

Normal braking remains available, but traction control and stability control may be disabled.

Can a weak battery cause C0246?

Yes.

Low voltage frequently causes communication faults between vehicle control modules.

Will C0246 clear itself?

No.

The underlying communication or electrical problem must be repaired before the code clears.

Does C0246 affect engine performance?

Usually no.

Engine torque reduction may not function correctly during traction control events, but everyday drivability is typically unaffected.

Final Thoughts

The C0246 code indicates a communication fault involving the Engine Torque Reduction Signal Circuit, preventing the ABS and traction control systems from coordinating with the engine computer. While the vehicle usually remains drivable, losing traction control and stability management can reduce safety on wet, icy, or loose road surfaces.

Most repairs involve diagnosing CAN bus communication, verifying battery voltage, inspecting wiring, updating module software, or replacing a faulty EBCM or PCM. A complete network scan is essential before replacing any control modules.

For additional chassis diagnostics and repair guides, browse our complete Chassis (C) OBD-II Code Library:

Related Articles

Exit mobile version