U1026 2018 Chevrolet Silverado Code - Lost Communication with Transfer Case Control Module
Quick Answer
Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted, Transfer Case Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U1026 2018 Chevrolet Silverado indicates Lost Communication with Transfer Case Control Module.
- Common causes
- Common causes include Faulty Transfer Case Control Module, Transfer Case Control Module harness is open or shorted, Transfer Case Control Module circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code U1026 2018 Chevrolet Silverado Description
What are the Possible Causes of the DTC U1026 2018 Chevrolet Silverado?
- Faulty Transfer Case Control Module
- Transfer Case Control Module harness is open or shorted
- Transfer Case Control Module circuit poor electrical connection
How to Fix the DTC U1026 2018 Chevrolet Silverado?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
It can occur if:
Someone changes a battery while the ignition switch is left on, that is, left in the Run position.
Someone flashes/upgrades their engine controller - other modules unable to communicate with PCM during this process - this will set U1026 at a multitude of controllers on the vehicle - all false codes. Erase and carry on.
May need to disconnect both battery cables and touch them together for 15 seconds. Reattach battery cables, positive first, then negative and see if a soft reset helps.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U1026 2018 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about U1026 2018 Chevrolet Silverado Code
1. What does the OBDII code U1026 mean on a 2018 Chevrolet Silverado?
The code U1026 indicates a lost communication with the Transfer Case Control Module (TCCM), which manages the vehicle's four-wheel-drive system.
2. What are the common symptoms of the U1026 code on a 2018 Silverado?
Symptoms may include the service 4WD light turning on, inability to switch between 4WD modes, or erratic four-wheel-drive operation.
3. What causes the U1026 code to appear on a Chevy Silverado?
Common causes include faulty wiring or connectors, a malfunctioning TCCM, network communication issues, or a failing battery or ground connection.
4. Can a weak battery cause the U1026 code?
Yes, a weak or failing battery can disrupt communication with the TCCM and trigger the U1026 code.
5. How do I diagnose the U1026 code on my 2018 Chevrolet Silverado?
Start by checking for loose or damaged wiring and connectors at the TCCM, inspecting the battery and ground connections, and verifying module communication with a scan tool.
6. Can I drive my Silverado with the U1026 code active?
While you may still be able to drive, the four-wheel-drive system may not function properly, which could affect performance in off-road or slippery conditions.
7. How is the U1026 code fixed on a 2018 Chevy Silverado?
Repairs may include repairing or replacing damaged wiring, ensuring proper battery voltage, updating or reprogramming the TCCM, or replacing the module if necessary.
8. Where is the Transfer Case Control Module located on a 2018 Silverado?
The TCCM is typically located under the dashboard on the driver’s side or near the transfer case under the vehicle.
9. Can a software update fix the U1026 code?
Yes, in some cases, a software update or reprogramming of the TCCM may resolve the communication issue and clear the code.
10. How much does it cost to repair the U1026 code on a Chevy Silverado?
Repair costs vary depending on the issue, but they can range from $50 for minor wiring repairs to $500 or more if the TCCM requires replacement.
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