U1858 Chevrolet Code - Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus
Quick Answer
The Drive Motor Control Modules and the Hybrid/EV Powertrain Control Module 1 are all internal to the Power Inverter Module. Common causes include Faulty Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain 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
- U1858 Chevrolet indicates Electronic Brake Control Module Lost Communication With Hybrid/EV Powertrain Control Module On Chassis Expansion CAN Bus.
- Common causes
- Common causes include Faulty Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain 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 U1858 Chevrolet Description
Communication diagnostics for the serial data, including device power and ground as well as the wakeup circuits for Drive Motor Control Modules and the Hybrid/EV Powertrain Control Module 1 are all diagnosed from external sources only to the Power Inverter Module connector because any circuit fault condition within the Power Inverter Module will cause a complete replacement.
The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received.
What are the Possible Causes of the DTC U1858 Chevrolet?
- Faulty Hybrid/EV Powertrain Control Module
- Hybrid/EV Powertrain Control Module harness is open or shorted
- Hybrid/EV Powertrain Control Module circuit poor electrical connection
How to Fix the DTC U1858 Chevrolet?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U1858 Chevrolet 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 U1858 Chevrolet Code
1. What are the common symptoms of OBDII code U1858 in a Chevrolet vehicle?
- Common symptoms include the ABS warning light or traction control light coming on, loss of communication with the hybrid/EV powertrain control module, and potential issues with the vehicle's braking system.
2. What could cause the OBDII code U1858 to be triggered in a Chevrolet?
- This code is typically triggered by a communication error between the electronic brake control module and the hybrid/EV powertrain control module on the chassis expansion CAN bus.
3. How serious is the U1858 code in a Chevrolet vehicle?
- The U1858 code should be addressed promptly as it can affect the communication between critical modules in the vehicle, potentially impacting the performance of the braking system and other safety features.
4. What are some possible repair tips for resolving the U1858 code in a Chevrolet?
- Start by checking the wiring and connections between the electronic brake control module and the hybrid/EV powertrain control module. Ensure all connections are secure and free of corrosion. Resetting the codes and performing a relearn procedure may also help resolve the issue.
5. Can a DIY enthusiast fix the U1858 code issue in a Chevrolet, or is professional help needed?
- While some DIY enthusiasts may be able to address the U1858 code by checking connections and performing basic troubleshooting, it is recommended to seek professional help, especially if the issue persists after basic checks.
6. How can I prevent the U1858 code from reoccurring in my Chevrolet vehicle?
- Regular maintenance and inspections of the vehicle's electronic systems, including the brake control module and powertrain control module, can help prevent communication errors that trigger the U1858 code.
7. Will driving my Chevrolet with the U1858 code present cause any further damage?
- Continuing to drive with the U1858 code present can potentially lead to further communication issues between critical modules in the vehicle, affecting safety features like the braking system. It is recommended to address the issue promptly.
8. Is it safe to drive my Chevrolet if the ABS warning light is on due to the U1858 code?
- While it may be safe to drive at low speeds, it is not recommended to drive the vehicle at high speeds or in hazardous conditions with the ABS warning light on. Have the issue diagnosed and repaired as soon as possible.
9. How long does it typically take to repair the U1858 code in a Chevrolet?
- The repair time for the U1858 code can vary depending on the underlying cause and the extent of the communication error. In some cases, it can be resolved quickly with simple checks and resets, while in others, thorough diagnosis and repairs may be needed.
10. Can weather conditions or environmental factors contribute to triggering the U1858 code in a Chevrolet?
- Extreme weather conditions or environmental factors such as moisture or corrosion can potentially contribute to communication errors between modules, leading to the triggering of the U1858 code. Regular inspections and maintenance can help mitigate these issues.
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