C0561 Code on Chevy Silverado: Causes, Fix & Reset (All Years)

C0561 on a Chevy Silverado means: ABS/traction control disabled because the Electronic Brake Control Module (EBCM) stopped receiving valid serial data from the Body Control Module (BCM).
Most common fix: clean and re-terminate the BCM ground strap behind the left-side of the dash. Cost: $0. Time: 30 minutes.

The Chevy Silverado is the most common GM vehicle to throw C0561, especially the 1500-series trucks from 2007 through 2018 that have seen any salt-belt winters. The code looks scary because it disables traction control, hill-start assist, and sometimes the cruise control — but the underlying cause is almost always a corroded ground wire or a low-voltage event, not a failing module.

Here's what it actually means on a Silverado, how to diagnose which of the three common causes you're dealing with, and the exact fix for each.

What C0561 Means on a Silverado

C0561 is a chassis DTC that translates to "System Disabled Information Stored — Invalid Serial Data Received." In plain English: the ABS/traction control module tried to talk to another module on the CAN bus (usually the BCM or the engine ECM) and got garbage back, or nothing at all. The system stored the code and disabled itself as a safety fallback.

This is NOT the same as C0281 (brake switch) or a wheel-speed sensor code. You do not need a new ABS module, a new BCM, or new wheel bearings. In fact, any mechanic who quotes you a $1,200 BCM swap for C0561 on a Silverado is wrong 90% of the time.

For the underlying GM-wide explanation of C0561 that applies across Malibu, Traverse, Cadillac, and Opel Insignia, see our master C0561 guide. This post focuses specifically on what to do when you own a Silverado.

C0561-71 vs C0561-72 vs C0561-74 on the Silverado

The subcode after the dash tells you which signal was invalid. On Silverados you'll almost always see one of three:

If you also see C0242 (PCM indicating traction control active), C0710 (steering angle sensor), or U0100 (lost communication with ECM) stored with C0561, the CAN bus is the problem — not the EBCM itself.

Symptoms You'll Notice on a Silverado

• Stabilitrak and Traction Control lights both on — the two lights usually come on together
• "Service StabiliTrak" or "Service Traction Control" message in the DIC
• ABS light on — sometimes, depending on which module lost comms
• Cruise control will not engage — Silverado disables cruise when the EBCM is flagged
• Hill-start assist disabled (2014+ trucks)
• Truck drives normally otherwise — engine power, braking, and steering are all unaffected
• Code may clear itself for days — then come back on the next cold morning or after rough road

The fact that the code comes and goes is a huge clue: it's a wiring or ground issue, not a dead module.

3 Most Common Silverado-Specific Causes

1. Corroded BCM ground strap (G200 or G201) — 65% of cases

The BCM on a Silverado grounds through a braided strap bolted to the steering column support. Over 8–12 years, that bolt loosens and the paint under the strap oxidizes. You get a good ground on a warm dry day, and a crappy one on a cold wet morning. The EBCM then sees CAN-bus voltage drift out of spec and stores C0561-71.

Symptom giveaway: the code triggers most often on cold starts and clears after the truck has been driven for 15–20 minutes.

2. Trailer brake controller wiring — 20% of cases

If you installed an aftermarket brake controller (or had a dealer install one) and tapped into the factory 7-way harness, there's a good chance the installer used the wrong pin or introduced a voltage drop on the brake controller signal wire. The EBCM sees this as invalid serial data and throws C0561-72.

Symptom giveaway: the code only appears when the trailer is plugged in, or appeared right after a trailer controller install.

3. ECM-to-EBCM harness at the radiator support — 10% of cases

The harness that runs from the ECM (on the engine) to the EBCM (on the driver-side firewall) passes through a connector near the radiator support. Road salt and moisture get into this connector on older trucks and corrode the pins. Result: C0561-74 "Engine Torque Signal Invalid."

Symptom giveaway: engine ground/battery symptoms too — dim headlights on startup, intermittent gauge flicker, or a stuck idle.

4. Low battery / failing alternator — 5% of cases

Any time the Silverado's electrical system drops below 10.5V during cranking or while running, multiple modules report communication errors. C0561 is a common casualty. If you've got a 5-year-old battery, replace it before chasing anything else.

Diagnosis Order (5 Minutes with a Multimeter)

1. Read the full code list with an OBD-II scanner that supports ABS/body codes (not every cheap reader does). Record every code, not just C0561. Companion codes like U0100 or C0242 narrow the diagnosis dramatically.
2. Load-test the battery. If it's below 600 CCA on a 650-CCA-rated battery, replace it and clear all codes. Drive for a week. If C0561 does not return, you're done.
3. Measure voltage at the BCM ground strap (behind the steering column, on the driver side). With the engine running, you should see less than 0.1V of drop between the strap's mounting bolt and the battery's negative terminal. If you see more than 0.3V, the strap is the problem.
4. Unplug the trailer controller if you have one. Clear codes. Drive. If C0561 does not return, you've found it — re-terminate the controller wiring correctly.
5. Inspect the ECM-to-EBCM connector near the radiator support for green corrosion. Clean with contact cleaner and dielectric grease.

Step-by-Step Fix: Refurbishing the BCM Ground Strap

Since the ground strap is the cause 65% of the time, start here.

1. Disconnect the negative battery terminal. Wait 60 seconds.
2. Locate the ground strap. Open the driver's door. Look under the dash on the driver's side, just to the left of the steering column. You'll see a braided copper/tin strap bolted to a welded nut on the support bracket. That's G200 (or G201 depending on year).
3. Remove the bolt. Usually a 10mm head. The bolt may be rusted — use penetrating oil if it fights you.
4. Clean both mating surfaces. Use a wire brush or 80-grit sandpaper on the strap's terminal AND the mounting point on the bracket. You want bare, shiny metal.
5. Apply a thin film of dielectric grease to both surfaces (prevents future corrosion without blocking conductivity).
6. Reinstall the bolt to 15 ft-lb. Do not over-torque — the welded nut will strip.
7. Reconnect the battery.
8. Clear the code with your scanner. Drive a mixed cycle (highway + city, 20+ minutes). The Traction Control and StabiliTrak lights should stay off.

If the code returns within a week, move on to the trailer controller or ECM harness checks.

Repair Cost

The important takeaway: do NOT pay a shop to replace the BCM without confirming via a multimeter that the ground strap and connectors are clean. The BCM replacement + programming is an 80%-unnecessary repair on Silverados.

Frequently Asked Questions

Will a Silverado with C0561 pass inspection?

In most states, a stored ABS/traction-control code will fail a safety inspection because the ABS light stays on. Emissions (OBD-II) inspections only care about the MIL and powertrain codes, so C0561 alone will not fail emissions — but the paired symptom (ABS light) usually triggers the safety failure.

Can I drive my Silverado with C0561?

Yes, for short distances. The base brakes, steering, and engine all still work normally. What you lose is ABS, traction control, Stabilitrak, and on newer trucks, hill-start assist and adaptive cruise. Do not drive like this on ice or wet roads — a panic stop without ABS is risky.

Does the C0561 code affect the transmission?

Not directly. The transmission module does not depend on the EBCM for operating the transmission. However, if C0561 shows up with U0100 (lost comms with ECM), your truck may also go into limp mode — that is a powertrain issue, not the ABS module.

Why does C0561 come back after I clear it?

Because the root cause — usually a bad ground or a corroded connector — has not been fixed yet. Clearing the code without fixing the cause only delays the re-trigger by hours or days. Follow the diagnosis order above to find the root cause before clearing.

Is C0561 covered under GM's emissions warranty?

No. The 8-year/80,000-mile federal emissions warranty only covers powertrain and emissions components. C0561 is a chassis code, not emissions-related. Any warranty coverage depends on your truck's age and whatever extended warranty you may have.

Can a cold battery cause C0561-71 on a 2014 Silverado?

Yes, this is a very common scenario. A weak battery that drops below 10.5V during cranking will cause the EBCM to see invalid serial data from the BCM on startup, and store C0561-71. Replace the battery before chasing anything else on a truck with a battery older than 4 years.