U1816 Code - Lost Communication With Drive Motor Control Module B On Bus B
Quick Answer
The U1816 diagnostic trouble code indicates that the vehicle's onboard computer system has lost communication with Drive Motor Control Module B on Bus B. Common causes include Faulty Drive Motor Control Module B, Wiring or connection issues between the modules, Corrosion or damage to the communication bus. 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
- U1816 indicates Lost Communication With Drive Motor Control Module B On Bus B.
- Common causes
- Common causes include Faulty Drive Motor Control Module B, Wiring or connection issues between the modules, Corrosion or damage to the communication bus.
- 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.
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Code U1816 Description
The U1816 diagnostic trouble code indicates that the vehicle's onboard computer system has lost communication with Drive Motor Control Module B on Bus B. This module is responsible for controlling various aspects of the vehicle's drive motor, such as speed, torque, and power distribution. When communication is lost, it can lead to a range of issues affecting the vehicle's performance and drivability. Without proper communication between the modules, the vehicle may experience hesitation, loss of power, erratic shifting, and even stalling. If left unresolved, this issue can potentially lead to more serious problems with the vehicle's drivetrain and electrical systems.
Common Causes of U1816
- Faulty Drive Motor Control Module B
- Wiring or connection issues between the modules
- Corrosion or damage to the communication bus
- Software glitches or programming errors
- Electrical system malfunctions
Symptoms of U1816
- Hesitation or lack of response when accelerating
- Loss of power
- Erratic shifting or transmission issues
- Stalling or difficulty starting the vehicle
- Illumination of the check engine light
How to Fix U1816
- Begin by conducting a thorough inspection of the wiring and connections between the modules to ensure there are no loose connections or damage.
- Check for any corrosion or damage to the communication bus and repair or replace as necessary.
- If no issues are found with the wiring or connections, proceed to diagnose the Drive Motor Control Module B for faults or malfunctions.
- Test the module for proper operation and communication with the onboard computer system.
- If the module is found to be faulty, replace it with a new or refurbished unit and reprogram as needed.
Cost to Fix U1816
The cost of repairing a lost communication issue with Drive Motor Control Module B on Bus B can vary depending on the specific cause of the problem and the cost of parts and labor. In general, the repair cost for this type of issue can range from $200 to $600, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, the cost may be higher if the module needs to be replaced or if other underlying issues are discovered during the repair process.
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Code U1816 Information for Specific Makes
- U1816 Buick — Lost Communication With Drive Motor Control Module B On Bus B
- U1816 Cadillac — Lost Communication With Drive Motor Control Module B On Bus B
- U1816 Chevrolet — Lost Communication With Drive Motor Control Module B On Bus B
- U1816 GMC — Lost Communication With Drive Motor Control Module B On Bus B
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