U1847 Cadillac Code - Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain 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 Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy 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
- U1847 Cadillac indicates Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus.
- Common causes
- Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy 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 U1847 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 U1847 Cadillac?
- Faulty Battery Energy Control Module
- Battery Energy Control Module harness is open or shorted
- Battery Energy Control Module circuit poor electrical connection
How to Fix the DTC U1847 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 U1847 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 U1847 Cadillac Code
What does the OBDII code U1847 mean for my Cadillac?
The U1847 code indicates that the Drive Motor Control Module 1 has lost communication with the Battery Energy Control Module on the Powertrain Expansion CAN Bus.
What are the common symptoms of the U1847 code?
Common symptoms include warning lights on the dashboard, reduced engine performance, and potential issues with hybrid system functionality.
What can cause the U1847 code to trigger?
Causes may include damaged wiring or connectors, a faulty Battery Energy Control Module, issues with the Drive Motor Control Module, or problems with the CAN Bus system.
How can I diagnose the U1847 code?
To diagnose the U1847 code, use an OBD-II scanner to read the code, inspect wiring and connectors for damage, and test the Battery Energy Control Module and Drive Motor Control Module for proper function.
What are some repair tips if I encounter the U1847 code?
Repair tips include checking and repairing any damaged wiring or connectors, clearing the code after repairs to see if it reappears, and ensuring that all modules are properly communicating on the CAN Bus.
Is it safe to drive my Cadillac with the U1847 code?
While you may be able to drive the vehicle, it is not recommended as it may lead to reduced performance or safety issues; it's best to have it diagnosed and repaired as soon as possible.
Could a dead battery cause the U1847 code?
Yes, a dead or weak battery can cause communication issues between modules, including the Battery Energy Control Module, potentially triggering the U1847 code.
What should I do after repairing the U1847 code?
After repairs, clear the code using an OBD-II scanner and perform a test drive to ensure that the code does not return and that all systems are functioning properly.
Can a software update fix the U1847 code?
In some cases, a software update may resolve communication issues between modules; consult a dealership or qualified mechanic to check for available updates.
How much does it typically cost to repair the U1847 code?
Repair costs can vary widely depending on the specific issue, but it generally ranges from $100 to $1,000, depending on whether it requires simple wiring repairs or replacement of modules.
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