U1847 Buick 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 Buick 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 Buick 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 Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What does the OBDII code U1847 mean for a Buick?
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.
2. What are the common symptoms of the U1847 code in a Buick?
Symptoms may include a check engine light, reduced power mode, erratic vehicle behavior, or issues with hybrid or electric drive functionality.
3. What causes the U1847 code to appear?
Common causes include a faulty Drive Motor Control Module, a defective Battery Energy Control Module, wiring or connection issues in the CAN bus network, or software glitches.
4. Can a bad battery cause the U1847 code?
Yes, a failing high-voltage battery or issues with its control module can trigger this communication error.
5. How do you diagnose the U1847 code?
Diagnosis involves scanning the vehicle with an OBDII tool, inspecting the CAN bus wiring and connectors, checking for updates to module software, and testing the functionality of the related modules.
6. Is it safe to drive with the U1847 code present?
Driving with this code may lead to reduced power or other performance issues, so it’s recommended to address it promptly to avoid further damage.
7. How do you fix the U1847 code?
Repairs may include repairing or replacing damaged CAN bus wiring, updating module firmware, or replacing a faulty Drive Motor Control Module or Battery Energy Control Module.
8. Can the U1847 code clear itself?
In rare cases, the code may clear if the underlying issue is intermittent, but most often, it requires repair and manual clearing with a scan tool.
9. How much does it cost to fix the U1847 code on a Buick?
Repair costs vary depending on the issue, ranging from $100 for wiring repairs to $1,000 or more for module replacement.
10. Can a software update fix the U1847 code?
Yes, if the issue is caused by outdated software in one of the affected modules, a software update may resolve the problem.
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