U1845 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 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 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?
- 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?
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 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.
Need more information about the U1845 code?
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Information for Specific Makes
- U1845 Buick — Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module
- U1845 Cadillac — Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module
- U1845 Chevrolet — Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module
- U1845 GMC — Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module
Frequently Asked Questions about U1845 Code
1. Can a U1845 OBDII code cause my hybrid or electric vehicle to suddenly lose power?
Yes, the U1845 code indicating a communication issue between the Drive Motor Control Module and Hybrid/EV Powertrain Control Module can lead to power loss.
2. What are common symptoms of a U1845 OBDII code?
Common symptoms include the vehicle going into a limp mode, reduced engine power, difficulty shifting gears, and illuminated warning lights on the dashboard.
3. What are possible causes of a U1845 code being triggered?
Possible causes include damaged wiring or connectors, a faulty Drive Motor Control Module, a malfunctioning Hybrid/EV Powertrain Control Module, or a software issue.
4. How can I diagnose a U1845 code?
Diagnosing a U1845 code typically involves using an OBDII scanner to retrieve the code, inspecting the wiring and connectors for damage, and testing the modules for proper functionality.
5. Is it safe to continue driving with a U1845 OBDII code?
It is not recommended to continue driving with a U1845 code as it can lead to further damage to the vehicle's components and potentially compromise safety.
6. Can I repair a U1845 OBDII code myself?
While some DIY enthusiasts may attempt to address a U1845 code by checking and cleaning connectors, diagnosing and repairing this issue often requires specialized tools and expertise.
7. How much does it typically cost to repair a U1845 OBDII code?
The cost of repairing a U1845 code can vary significantly depending on the specific cause of the issue, the extent of the damage, and the labor rates of the repair shop. It's advisable to get a few quotes from different mechanics.
8. Will a U1845 code affect the vehicle's fuel efficiency?
Yes, a U1845 code can impact the vehicle's fuel efficiency as it may cause the engine to run inefficiently or enter a reduced power mode.
9. Can extreme weather conditions trigger a U1845 OBDII code?
Extreme weather conditions such as extreme cold or heat can potentially affect the communication between modules and lead to a U1845 code being triggered.
10. How long does it typically take to repair a U1845 OBDII code?
The repair time for a U1845 code can vary depending on the exact cause of the issue and the availability of parts. Some repairs may be completed in a few hours, while others may take longer if extensive diagnostics are required.
Discuss the causes and fixes for U1845 OBDII Code
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