U1846 Cadillac Code - Drive Motor Control Module 2 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
- U1846 Cadillac indicates Drive Motor Control Module 2 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 U1846 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 U1846 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 U1846 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 U1846 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 U1846 Cadillac Code
1. What are the common symptoms of OBDII code U1846 in a Cadillac related to Drive Motor Control Module 2 Lost Communication With Hybrid/EV Powertrain Control Module?
- Common symptoms include the hybrid system not engaging, the vehicle going into limp mode, and the Check Engine Light illuminating.
2. What are some possible causes of OBDII code U1846 in a Cadillac?
- Possible causes include a faulty drive motor control module, issues with the hybrid/EV powertrain control module, damaged wiring or connectors, or software communication errors.
3. How can I diagnose the cause of OBDII code U1846 in a Cadillac?
- Diagnosis involves using a diagnostic scanner to retrieve the trouble codes, checking the wiring and connectors for any damage, and performing a thorough inspection of the drive motor control module and hybrid/EV powertrain control module.
4. Can OBDII code U1846 in a Cadillac be repaired at home?
- While some basic troubleshooting like checking connections and fuses can be done at home, diagnosing and repairing the specific cause of this code may require advanced tools and expertise, so it's recommended to consult a professional mechanic.
5. Is it safe to continue driving with OBDII code U1846 in a Cadillac?
- It is not recommended to continue driving with this code present, as it can affect the operation of the hybrid system and potentially lead to further damage. It's best to address the issue promptly.
6. Are there any common mistakes to avoid when dealing with OBDII code U1846 in a Cadillac?
- One common mistake is to overlook the importance of thoroughly inspecting all components related to the drive motor control module and the hybrid/EV powertrain control module, as a simple oversight can lead to misdiagnosis.
7. How much does it typically cost to repair OBDII code U1846 in a Cadillac?
- The cost of repair can vary depending on the specific cause of the code, the labor rates in your area, and whether any parts need to be replaced. It's best to get a diagnosis from a mechanic for an accurate estimate.
8. Can resetting the trouble codes clear OBDII code U1846 in a Cadillac?
- While resetting the trouble codes may temporarily turn off the Check Engine Light, the underlying issue causing the code will still need to be addressed for a permanent fix.
9. How long does it usually take to repair OBDII code U1846 in a Cadillac?
- The repair time can vary depending on the cause of the code and the complexity of the repair. It can range from a quick fix to a more involved repair that may take several hours or days.
10. Are there any recalls or technical service bulletins related to OBDII code U1846 in Cadillac vehicles?
- It's recommended to check with a Cadillac dealership or online resources for any relevant recalls or technical service bulletins related to this specific OBDII code, as manufacturers may provide guidance on known issues and solutions.
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