U1845 GMC Code - Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module
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 Power Inverter Module, Power Inverter Module harness is open or shorted, Power Inverter 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
- U1845 GMC indicates Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module.
- Common causes
- Common causes include Faulty Power Inverter Module, Power Inverter Module harness is open or shorted, Power Inverter 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 U1845 GMC 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 U1845 GMC?
- Faulty Power Inverter Module
- Power Inverter Module harness is open or shorted
- Power Inverter Module circuit poor electrical connection
How to Fix the DTC U1845 GMC?
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 U1845 GMC 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 U1845 GMC Code
1. What are the common symptoms of OBDII code U1845 in a GMC vehicle?
- Common symptoms include loss of power, decreased fuel efficiency, and the illumination of the check engine light.
2. What are some possible causes of OBDII code U1845 in a GMC vehicle?
- Possible causes include a faulty drive motor control module, issues with the hybrid/EV powertrain control module, wiring problems, or a poor connection.
3. How can I diagnose OBDII code U1845 in my GMC vehicle?
- Diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking for any related codes, and inspecting the wiring and connections between the drive motor control module and the hybrid/EV powertrain control module.
4. Can I still drive my GMC vehicle with OBDII code U1845 present?
- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potentially unsafe driving conditions.
5. How can I repair OBDII code U1845 in my GMC vehicle?
- Repair usually involves addressing the root cause of the communication loss, such as replacing a faulty drive motor control module, repairing wiring issues, or fixing poor connections.
6. Is it safe to reset the OBDII code U1845 without fixing the underlying issue?
- It is not recommended to simply reset the code without addressing the underlying problem, as it may lead to recurring issues and potential safety hazards.
7. Can a DIY enthusiast fix OBDII code U1845 in a GMC vehicle?
- While some basic troubleshooting and repairs can be done by DIY enthusiasts, diagnosing and repairing complex communication issues like U1845 may require professional expertise and specialized tools.
8. How much does it typically cost to repair OBDII code U1845 in a GMC vehicle?
- The cost of repairs can vary depending on the root cause of the issue, but it may range from a few hundred dollars for basic fixes to over a thousand dollars for more extensive repairs.
9. Are there any preventative maintenance tips to avoid OBDII code U1845 in a GMC vehicle?
- Regularly servicing and inspecting the hybrid/EV powertrain system components can help prevent issues that may lead to code U1845, such as ensuring proper connections and wiring integrity.
10. How long does it usually take to repair OBDII code U1845 in a GMC vehicle?
- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to a full day for a professional technician to diagnose and fix the problem.
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