U1846 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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 Chevrolet Code
What does the OBDII code U1846 mean for a Chevrolet vehicle?
The code U1846 indicates that there is a lost communication between the Drive Motor Control Module 2 and the Hybrid/EV Powertrain Control Module, which can affect the vehicle's hybrid or electric powertrain performance.
What are common symptoms associated with the U1846 code?
Symptoms may include warning lights on the dashboard, reduced power, engine stalling, or the vehicle not entering electric mode, affecting overall driveability.
What could cause the U1846 code to appear?
Potential causes include faulty wiring or connectors, a malfunctioning Drive Motor Control Module 2, issues with the Hybrid/EV Powertrain Control Module, or even software glitches.
How can I diagnose the U1846 code?
Start by using a scan tool to confirm the code and check for any other related codes. Inspect wiring and connectors for damage, and test the operation of both control modules.
What repairs might be necessary if I have the U1846 code?
Repairs may include repairing or replacing damaged wiring or connectors, replacing the Drive Motor Control Module 2 or Hybrid/EV Powertrain Control Module, or updating the vehicle's software.
Can I drive my Chevrolet if the U1846 code is present?
It is not recommended to drive the vehicle if this code is present, as it may lead to reduced performance or further damage to the powertrain system.
Is the U1846 code common in hybrid or electric vehicles?
Yes, the U1846 code is more commonly seen in hybrid and electric vehicles due to their reliance on multiple control modules for managing powertrain operations.
How much might it cost to fix the U1846 code?
Repair costs can vary widely; simple wiring repairs may cost less than $100, while replacing control modules could range from $500 to over $1,500 depending on the vehicle and labor costs.
Are there any preventative measures I can take to avoid the U1846 code?
Regular maintenance of your vehicle’s electrical system, including inspecting and cleaning connectors and ensuring software updates are applied, can help prevent communication issues between control modules.
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