U0110 Lost Communication with Drive Motor Control Module (DMCM)

OBD-II DTC Datasheet

Lost Communication With Drive Motor Control Module (DMCM)

What does this mean?

This is a generic communications DTC that applies to most makes and models of vehicles, including but not limited to Toyota, Ford, Chevrolet, Hyundai, and Honda. This code means that the drive motor control module (DMCM) and other control modules on the vehicle are not communicating with each other.

The circuitry most commonly used for communication is known as Controller Area Bus communication, or simply the CAN bus. Without this CAN bus, control modules cannot communicate and your scan tool may not receive information from the vehicle, depending on which circuit is involved.

The DMCM can also be called an inverter-converter assembly. The DMCM communicates with the engine computer (PCM) to determine how the drive motors will be used: connect to the vehicle's batteries as drive motors; together with a gasoline engine as a dual power supply; or as generators that charge batteries when a gasoline engine is driving a car, or during deceleration and braking, known as regenerative braking.

Troubleshooting steps may vary depending on the manufacturer, the type of communication system, the number of wires, and the colors of the wires in the communication system.

symptoms

Symptoms of a U0110 engine code may include:

Malfunction Indicator Light (MIL) is on
Hybrid Warning Indicator On
The car cannot start or run

reasons

Usually the reason for installing this code is:

Open in CAN + bus circuit
Open in the CAN bus - electrical circuit
Short circuit to power in any CAN bus circuit
Short to ground in any CAN bus circuit
Rarely - the control module is faulty

Diagnostic and repair procedures

A good starting point is always to check the Technical Service Bulletins (TSB) for your particular vehicle. Your problem may be a known issue with a known manufacturer-released fix and could save you time and money while troubleshooting.

First, look for other DTCs. If any of these are bus communication or battery / ignition related, diagnose them first. Misdiagnosis is known to occur if you diagnose the U0110 code before any of the major codes are thoroughly diagnosed and rejected.

If your scan tool can access trouble codes and the only code you are getting from other modules is U0110, try contacting the DMC module. If you can access the codes from the DMC module, then code U0110 is either intermittent or a memory code. If the GPCM module cannot be contacted, then code U0110 set by other modules is active and the problem already exists.

The most common failure is a loss of power or ground.

Before going any further, give a caveat: This is a high voltage system! If the warnings are not heeded and / or the manufacturer's protective and diagnostic measures are not followed, damage to the vehicle is VERY likely and could result in injury / personal injury for you. If you are not sure about any stage of the diagnostics, it is strongly recommended that you leave the diagnostics of this code in this system to someone who has been trained in it.

Check all fuses supplying the DMC module on this vehicle. Check all earthing connections of the DMC module. Locate grounding attachment points on the vehicle and make sure these connections are clean and secure. If necessary, remove them, take a small wire bristle brush and baking soda / water solution and clean each one, both the connector and the place where it connects.

If any repairs have been made, clear the diagnostic trouble codes from all modules that set the code in memory and see if U0110 returns or you can contact the DMC module. If no code is returned or communication with the DMC is restored, the problem is most likely a fuse / connection issue.

If the code returns, look for the CAN bus connections on your specific vehicle, especially the DMC module connector.

DISCONNECT THE HIGH VOLTAGE SYSTEM, FOLLOWING ALL THE PRODUCER'S PRECAUTIONS AND PROCEDURES,

Then disconnect the negative battery cable before disconnecting the connector on the DMC. Once detected, visually inspect the connectors and wiring. Look for scratches, scuffs, exposed wires, burn marks, or molten plastic. Disconnect the connectors and carefully inspect the terminals (metal parts) inside the connectors. See if they look burnt or have a green tint indicating corrosion. If you need to clean the terminals, use an electrical contact cleaner and a plastic bristle brush. Allow to dry and apply dielectric silicone grease where the terminals touch. Reconnect all connectors. Clear all codes.

If communication is still not possible or you were unable to clear DTC U0110, the only thing to do is to seek help from a trained automotive diagnostician as this may indicate a faulty DMCM or possible wiring problems with the CAN bus communication system . For proper installation, DMCMs must be programmed or calibrated for the vehicle.

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