U0140 ошибка volvo

Content

• OBD-II Trouble Code — U0140 — Data Sheet
• What does DTC U0140 mean?
• Symptoms
• Possible Causes of Error U0140
• Diagnostic and repair procedures
• U0140 engine code hints
• How serious is code U0140?
• Can I still drive with code U0140?
• How difficult is it to check code U0140?
• Common Mistakes
• Related codes
• Need more help with the U0140 code?

OBD-II Trouble Code — U0140 — Data Sheet

Lost Communication With Body Control Module

What does DTC U0140 mean?

This is a generic powertrain code which means it applies to all makes / models from 1996, including but not limited to Ford, Chevrolet, Nissan, GMC, Buick, etc. However, specific troubleshooting steps may differ from vehicle to vehicle.

The Body Control Module (BCM) is an electronic module that is part of the vehicle’s entire electrical system and controls functions including, but not limited to, tire pressure sensor, remote keyless entry, door locks, anti-theft alarm, heated mirrors, rear defroster windows, front and rear washers, wipers and horn.

It also receives shift signals from seat belts, ignition, horn telling you the door is ajar, parking brake, cruise control, engine oil level, cruise control, and a wiper and wiper. Battery discharge protection, temperature sensor, and hibernation function may be affected by a bad BCM, a loose connection to the BCM, or an open / short circuit in the BCM harness.

Code U0140 refers to the BCM or the wiring to the BCM from the Engine Control Module (ECM). The code, depending on the year, make and model of the vehicle, may indicate that the BCM is defective, that the BCM is not receiving or sending a signal, the BCM wiring harness is open or shorted, or that the BCM is not communicating. with the ECM via the controller network — CAN communication line.

Example of a body control module (BCM):

The code can be detected when the ECM has not received the emissions CAN signal from the BCM for at least two seconds. Note. This DTC is basically identical to U0141, U0142, U0143, U0144, and U0145.

Symptoms

Not only will the MIL (aka check engine light) come on, notifying you that the ECM has set a code, but you may also notice that some body control functions are not working properly. Depending on the type of problem — wiring, the BCM itself, or a short circuit — some or all of the systems that are controlled by the body control module may not work correctly or not work at all.

Other symptoms of engine code U0140 may include.

• Misfire at high speeds
• Shivers when you increase your speed
• Poor acceleration
• The car may not start
• You can blow fuses all the time.

Possible Causes of Error U0140

Several incidents can cause the BCM or its wiring to fail. If the BCM is electrocuted in an accident, that is, if it is shaken hard enough by the shock, it may be completely damaged, the wiring harness may be knocked off, or one or more of the wires in the harness may be exposed or cut completely. If a bare wire touches another wire or a metal part of the vehicle, it will cause a short circuit.

Excessive heating of a vehicle engine or fire can damage the BCM or melt insulation on the wiring harness. On the other hand, if the BCM turns out to be waterlogged, it will most likely fail. In addition, if the sensors are clogged with water or otherwise damaged, the BCM will not be able to do what you tell it to, that is, remotely open the door locks; it also cannot send this signal to the ECM.

Definition

U0140 is an OBD-II Code that refers to Lost Communication With Body Control Module

Meaning

A U0140 code is a generic communication systems diagnostic trouble code that refers to the communications circuit between the With Body Control Module and other control modules on the vehicle.

The body control module (BCM) is an electronic instrument that is a part of the vehicle’s total electrical system and controls procedures including but not limited to the tire pressure monitoring, remote keyless entry, door locks, anti-theft alarm, heated mirrors, rear window defroster, front and rear washers and wipers.

Causes

Common causes for this code include:

• Malfunctioned Body Control Module (BCM)
• Body Control Module (BCM) circuit poor electrical connection
• Body Control Module (BCM) harness is open or shorted

Symptoms

The symptoms of a U0140 code are:

• It’s not possible to start the car.
• Some BCM capabilities are not accessible.
• At high speeds, the engine has frequent failures.
• The acceleration is unpredictable.
• The car is plagued with constant blowing of fuses.

Diagnosis

To diagnose a U0140 DTC code, a technician would:

1. Check the Body Control Module (BCM) with a Digital Multi-Meter for signs of corrosion or damaged pins
2. Check the wire harness that goes from the Body Control Module to the car’s computer. 
3. Check the car’s fuse panel and replace any blown fuses with a matching number.
4. Check the instrument panel cluster (IPC) for signs of corrosion or burned pins.
5. Check the car’s battery to ensure it has enough voltage and cold cranking amps (CCA).
6. Connect a Scan Tool to check all communication between components.

Common mistakes

The following are some of the most common mistakes that a technician may make when diagnosing a U0140 code:

• Not inspecting the Body Control Module
• In an attempt to check all wires from the BCM, a technician may accidentally disconnect a wire that is important for car’s performance 
• Not checking all the fuses in the fuse box 
• Not replacing a blown fuse with a matching number 
• Neglecting to check the IPC for corrosion 
• Not connecting a Scan Tool to diagnose all vehicle components 
• Not checking the car’s battery voltage and CCA 
• Replacing parts that are not faulty or incorrectly

How serious is this?

A U0140 code is considered to be a serious code because if not diagnosed and repaired immediately, it can lead to a breakdown or even an accident. 

A U0140 code helps technicians know that the vehicle is experiencing problems with one of its modules. This helps them prioritize what needs attention first. 

A U0140 DTC code is not considered to be a critical system and can be diagnosed and repaired in a timely manner.

What repairs can fix the code?

The following are solutions that may fix this problem:

• Replace the Body Control Module (BCM)
• Repair or replace the damaged harness 
• Replace Bad fuse
• Check the Body Control Module (BCM) connectors for corrosion and clean with a wire brush as necessary. 
• Repair or replace the damaged wiring and connections
• Replace Blown Fuse with a matching number

Related codes

A U0140 is related to and may be accompanied by the following codes:

C0040, P0366, P0551, P0406, P0014, P0620, P0341, C0265, P0711, P0107, P0230, P2509

Conclusion

In conclusion, the U0140 code is a communication error between the Body Control Module and other control modules on the car. When a U0140 DTC code appears, it’s usually accompanied by several other codes to help diagnose what needs attention first. A technician may not always be able to determine the exact cause of the U0140 code from the information given but can perform a few tests that will give them enough clues to fix or replace parts as necessary. It’s important for technicians to keep in mind that a U0140 DTC code is considered to be a critical system and can should be diagnosed and repaired in a timely manner.