U1845 Cadillac 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 Cadillac 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 Cadillac 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 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What are the common symptoms of OBDII code U1845 in a Cadillac related to Drive Motor Control Module 1 communication loss with Hybrid/EV Powertrain Control Module?
- Common symptoms include loss of power, poor acceleration, abnormal engine or hybrid system behavior, and dashboard warning lights related to the hybrid or EV system.
2. What are the possible causes of OBDII code U1845 in a Cadillac?
- Possible causes include faulty wiring or connections, damaged components in the Drive Motor Control Module or Hybrid/EV Powertrain Control Module, software issues, or a malfunctioning communication network.
3. How can I diagnose the OBDII code U1845 in a Cadillac?
- Diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking for other related codes, inspecting wiring and connectors for damage, and performing communication network tests.
4. Are there any DIY repair tips for fixing OBDII code U1845 in a Cadillac?
- DIY repair options are limited for this code due to the specialized nature of hybrid and EV systems. It is recommended to seek assistance from a trained technician or a Cadillac dealership for proper diagnosis and repair.
5. Can I still drive my Cadillac with OBDII code U1845 present?
- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid or EV system. It is best to have the issue diagnosed and repaired promptly.
6. How much does it typically cost to repair OBDII code U1845 in a Cadillac?
- Repair costs can vary depending on the exact cause of the issue. Costs may include diagnostic fees, parts replacement, and labor charges, which can add up to several hundred dollars or more.
7. Will resetting the OBDII code U1845 in a Cadillac make the problem go away?
- Resetting the code may temporarily clear the dashboard warning light, but it will not fix the underlying issue causing the communication loss between the Drive Motor Control Module and Hybrid/EV Powertrain Control Module.
8. Is OBDII code U1845 specific to Cadillac vehicles, or can it occur in other makes and models?
- While this specific code may be unique to Cadillac vehicles, similar communication loss issues between control modules can occur in other hybrid or EV vehicles from different manufacturers.
9. How long does it take to repair OBDII code U1845 in a Cadillac?
- The repair time can vary depending on the exact cause of the issue and the availability of parts. In some cases, repairs can be completed within a few hours, while more complex issues may take longer to diagnose and fix.
10. Are there any recalls or technical service bulletins related to OBDII code U1845 in Cadillac vehicles?
- It is recommended to check with Cadillac or the National Highway Traffic Safety Administration (NHTSA) for any recalls or technical service bulletins related to this specific OBDII code to see if there are known issues or remedies provided by the manufacturer.
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