AutoCodes – Ford – U012D Ford

U012D Ford Code - Lost Communication With Generator Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Generator Control Module, Generator Control Module harness is open or shorted, Generator Control 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: U012D Ford indicates Lost Communication With Generator Control Module.
Common causes: Common causes include Faulty Generator Control Module, Generator Control Module harness is open or shorted, Generator Control 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.

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Code Popularity 20,417

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U012D Ford Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Generator Control Module has not been received.

OBDII Code U012D Ford - Lost Communication With Generator Control Module - AutoCodes.com — U012D Ford Code - Lost Communication With Generator Control Module

What does this mean?

What are the Possible Causes of the DTC U012D Ford?

Faulty Generator Control Module
Generator Control Module harness is open or shorted
Generator Control Module circuit poor electrical connection

How to Fix the DTC U012D Ford?

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 U012D Ford 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U012D Ford Code

1. What are the common symptoms of OBDII code U012D Ford?

- Common symptoms include issues with the vehicle's charging system, such as intermittent or complete loss of power to the battery.

2. What can cause the OBDII code U012D Ford to appear?

- The code U012D is triggered when the powertrain control module (PCM) detects a communication failure with the generator control module (GCM).

3. How can I diagnose the cause of the U012D code on my Ford vehicle?

- Proper diagnosis involves checking the wiring and connections between the PCM and GCM, as well as testing the GCM for proper function.

4. Can a weak battery or alternator cause the U012D code to be set?

- Yes, a weak battery or alternator can lead to communication errors between the PCM and GCM, potentially triggering the U012D code.

5. What are some repair tips for addressing the U012D code related to the generator control module?

- It is essential to inspect and repair any damaged wiring, ensure proper connections, and replace the GCM if necessary to resolve the communication issue.

6. Is it safe to continue driving with the U012D code present?

- It is not recommended to drive the vehicle with the U012D code, as it can lead to further electrical system problems and potential stalling or loss of power while driving.

7. Can a DIY enthusiast fix the U012D code issue, or is professional help required?

- While some basic troubleshooting like checking connections can be done by DIY enthusiasts, resolving the U012D code related to the GCM may require professional expertise and specialized tools.

8. How much does it typically cost to repair the U012D code on a Ford vehicle?

- The cost of repairing the U012D code can vary depending on the extent of the issue, but it may involve expenses for parts replacement and labor charges at a repair shop.

9. Will resetting the OBDII code U012D clear the issue temporarily?

- Resetting the code may temporarily clear the warning light, but if the underlying communication problem between the PCM and GCM persists, the code is likely to reappear.

10. Are there any recalls or technical service bulletins related to the U012D Ford code?

- It's advisable to check with Ford dealership or official sources for any recalls or technical service bulletins specific to the U012D code to see if there are known issues or remedies provided by the manufacturer.