U1847 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 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 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?
- 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?
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 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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Information for Specific Makes
- U1847 Buick — Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
- U1847 Cadillac — Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
- U1847 Chevrolet — Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
- U1847 GMC — Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
Frequently Asked Questions about U1847 Code
1. What are the common symptoms of OBDII code U1847?
- Common symptoms include the check engine light coming on, reduced hybrid system performance, and potential drivability issues.
2. What could cause OBDII code U1847 to appear?
- This code usually indicates a communication failure between the Drive Motor Control Module 1 and the Battery Energy Control Module on the Powertrain Expansion CAN Bus.
3. How can I diagnose the cause of OBDII code U1847?
- Diagnosing this code typically involves checking the wiring and connections between the Drive Motor Control Module 1 and the Battery Energy Control Module, as well as verifying the modules themselves are functioning correctly.
4. Can a faulty battery be the cause of OBDII code U1847?
- Yes, a faulty or weak battery can sometimes trigger communication issues between modules, leading to the U1847 code.
5. Are there any repair tips for addressing OBDII code U1847?
- Repair tips may include checking for loose or damaged wiring, ensuring proper module connections, and performing a software update if available.
6. Is it safe to continue driving with OBDII code U1847 present?
- It is generally not recommended to continue driving with this code as it could affect the performance and safety of the vehicle.
7. Can resetting the check engine light resolve OBDII code U1847?
- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.
8. How much does it typically cost to repair OBDII code U1847?
- The cost of repair can vary depending on the exact cause of the code and whether any components need to be replaced. It's advisable to consult a professional for an accurate estimate.
9. Will OBDII code U1847 cause a vehicle to fail an emissions test?
- Yes, this code can cause a vehicle to fail an emissions test, as it signifies a problem with the hybrid system that can impact emissions control.
10. Can a DIY enthusiast fix OBDII code U1847, or is it best left to professionals?
- Depending on the severity of the issue and the individual's expertise, some DIY enthusiasts may be able to address the code themselves. However, complex electrical and hybrid system problems are usually best handled by professionals.
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