OBD-II Diagnostic Trouble Code
U0293 — Lost Communication With Hybrid Vehicle Control System
U0293 means modules stopped receiving messages from the hybrid vehicle control system, the supervisory controller that coordinates the engine, electric motor and high-voltage battery. Its expected messages did not arrive within the allowed time. This applies only to hybrid or electrified trucks.
Severity 4/5
Less common on commercial trucks
Stop within 50 mi
Severity
Stop within 50 mi
Lost Communication With Hybrid Vehicle Control System
Code
U0293
Category
Network
Subsystem
Network
Truck-relevant
Less common
What this means for truckers
Stop within ~50 miles. Driving longer risks damaging adjacent components (turbo housing, head gasket, aftertreatment) and turning a $300 fix into a $3,000 fix.
Before you replace parts — try this first
U0293 on the Network system is most often fuse, power or ground fault at the hybrid controller — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Hybrid system warning lights, loss of electric assist or regeneration, reduced power, and possibly a no-start or engine-only operation. The truck may go into a limp mode.
Common causes
- CommonFuse, power or ground fault at the hybrid controller ($50–$300)
- CommonLow 12-volt battery voltage ($100–$700)
- OccasionalNetwork wiring or connector damage ($150–$600)
- RareFailed hybrid control module ($800–$3000)
How to fix
Test the 12-volt battery and charging system, which power the control electronics
When to use: First step
Check power, ground and network circuits at the hybrid controller using high-voltage safety procedures
When to use: When the 12-volt system is good
Reprogram or replace the hybrid controller
When to use: After the wiring has been verified
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → U0214 — Lost Communication With Remote Function Actuation
- → U0235 — Lost Communication With Cruise Control Front Distance Range Sensor
- → U0294 — Hybrid Vehicle Control System Internal Performance
Frequently Asked Questions
Can I drive with code U0293?
Drive with caution. U0293 is severity 4 — stop within ~50 miles. Most commercial diesel codes at this severity (turbo, fuel rail, transmission solenoid) can damage adjacent expensive components if left unrepaired. Get to a service location before highway-speed loads.
How much does it cost to fix U0293 on a commercial truck?
Total repair cost ranges $50–$3000 depending on the root cause. The cheapest fix is usually the first one listed below — Fuse, power or ground fault at the hybrid controller — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will U0293 fail a DOT inspection?
U0293 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between U0293 and related codes?
U0293 is closely related to: U0214 (Lost Communication With Remote Function Actuation), U0235 (Lost Communication With Cruise Control Front Distance Range Sensor), U0294 (Hybrid Vehicle Control System Internal Performance). These codes share the same subsystem (network) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only U0293 is set without the companions, the issue is more isolated.
How do I prevent U0293 from coming back after a repair?
For U0293 (Lost Communication With Hybrid Vehicle Control System), prevention centers on the network system. Pay attention to ground connections at every PM — bad grounds are 70% of communication codes. Inspect harness routing for chafe points. Don't disconnect modules with the key on.