U1846
Drive Motor Control Module 2 Lost Communication With Hybrid/EV Powertrain Control Module
U1846 is an OBD-II diagnostic trouble code meaning: Drive Motor Control Module 2 Lost Communication With Hybrid/EV Powertrain Control Module. Common causes: broken or damaged can bus wires, engine control module malfunction. Estimated repair cost: $56–333.
Symptoms
- Check Engine Light Is On
- The hybrid system goes into emergency mode
- Reduced power or efficiency
- Battery charging/discharging problems
Causes
- Broken or damaged CAN bus wires
- Engine control module malfunction
- Malfunction of the hybrid transmission control module
- Problems with power supply or grounding of modules
- Corrosion of connectors
How to Fix
- Checking the integrity of the CAN bus wiring
- Engine control module diagnostics
- Diagnostics of the hybrid transmission control module
- Checking connectors and contacts for corrosion
- Testing power supply and grounding of modules
Related codes
FAQ
What does the U1846 code mean?
U1846 is an OBD-II diagnostic trouble code that indicates: Drive Motor Control Module 2 Lost Communication With Hybrid/EV Powertrain Control Module
What causes a U1846 error code?
The most common causes of U1846 include: Broken or damaged CAN bus wires; Engine control module malfunction; Malfunction of the hybrid transmission control module; Problems with power supply or grounding of modules.
How do I fix a U1846 diagnostic trouble code?
To fix U1846: Checking the integrity of the CAN bus wiring. Engine control module diagnostics. Diagnostics of the hybrid transmission control module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1846?
Limited driving only, diagnose soon
How much does it cost to fix U1846?
The estimated repair cost for U1846 is $56–333. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat