U0073 on Chevrolet: How to Diagnose & Fix
Control Module Communication Bus Off
1 Chevrolet model · 2 documented issues · 2 critical · $400-$1,600 repair
U0073 on Chevrolet by model: symptoms, diagnosis and fix
The 2008-2012 Malibu electric power steering system can suddenly lose assist, reverting to heavy manual steering. The EPS motor, controller, or steering column torque sensor fails. GM issued a special coverage program (10 years/150,000 miles) for this issue. When EPS fails, a warning message and chime sound, and the steering becomes very heavy at low speeds.
Common Symptoms
- Power Steering warning message on DIC
- Steering suddenly becomes very heavy
- Service ESC warning light
- Steering assist intermittent, especially in cold weather
- Steering wheel difficult to turn at parking speeds
How to Fix
Sources for this issue (1)
The 2013+ Malibu uses an electric power steering (EPS) system with a column-mounted motor that is prone to failure. The motor develops internal faults causing intermittent or complete loss of power steering assist, making the car extremely difficult to steer at low speeds. GM issued TSB 18-NA-205 and NHTSA investigated numerous complaints. The steering column module and torque sensor can also fail, triggering a "Service Power Steering" message on the DIC.
Common Symptoms
- "Service Power Steering" message on DIC
- Steering suddenly becomes very heavy
- Intermittent loss and return of power assist
- Steering wheel jerks or pulls to one side
- Warning light clears after restart but returns
How to Fix
Have the EPS motor and torque sensor diagnosed with a scan tool — the module stores specific fault codes. Replacement of the EPS motor assembly costs $400-$800 for parts and $200-$400 for labor. In some cases, a software recalibration of the EPS module resolves intermittent faults. Check for applicable GM TSBs, as some vehicles may qualify for extended warranty coverage. Never ignore a power steering warning — sudden loss of assist at highway speed is a safety hazard.
Sources for this issue (1)
U0073 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U0073 mean on a Chevrolet?
U0073 stands for "Control Module Communication Bus Off." U0073 means the vehicle's communication bus has shut down, or 'gone off,' meaning a control module detected so many errors on the network that it stopped transmitting to protect the bus. On a CAN network, repeated faulty signals cause a module to take itself offline, which can cascade into multiple warning lights and disabled features. This is a network/wiring code rather than a single failed sensor, and it usually points to a wiring short, a defective module flooding the bus, or a power/ground issue affecting communication. It often requires checking the whole bus circuit, not just one part. On Chevrolet it is documented across 1 model: Malibu.
What are the most common causes of U0073?
The most common causes of U0073 are: Short to power or ground on the CAN bus wiring, CAN high/low wires shorted together, A failing module continuously corrupting bus traffic, Corroded, loose, or damaged bus connectors, Loss of power or ground to a network module, Faulty gateway/central communication module, Improper or missing bus terminating resistor. The specific cause varies by vehicle.
How much does it cost to fix U0073 on a Chevrolet?
Published repair estimates on Chevrolet range from $400 to $1,600 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for U0073 on a different make?
View U0073 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.