The automobile fault code U1123 indicates a problem with the vehicle speed sensor or its connections. This fault code can be caused by faulty wiring, intermittent connections at the Powertrain Control Module (PCM) or Anti-Lock Brake Module (ABS), or wiring that is shorted to power or ground. The symptoms of this fault code are not specified.

However, it is important to address this issue promptly as it can affect the vehicle’s performance and safety. The repair for this fault code involves visually inspecting the wiring harness and connectors for damage and checking for broken, bent, pushed out, or corroded connector pins. The repair time for this fault code is estimated to be 1.0.

It is crucial to interpret the fault code correctly to ensure the proper repair is made.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

Here are some symptoms that may indicate the presence of the automobile fault code u1123:

  • The fault code U1123 indicates a communication problem between the vehicle’s electronic control module and the instrument cluster.
  • Symptoms of this fault code include the instrument cluster not working properly, the speedometer not functioning, the fuel gauge not displaying the correct level, the engine warning light staying on, and the vehicle not starting.
  • Additionally, the transmission may not shift properly, and the vehicle may experience a loss of power.
  • It is important to have this issue diagnosed and repaired promptly to avoid further damage to the vehicle.

The u1123 automobile fault code can be caused by various factors, including faulty sensors and wiring connections.

  • The automobile fault code u1123 can be caused by a faulty or intermittent vehicle speed sensor or connections.
  • It can also be caused by J1850/SCP/CAN Bus wiring that is intermittently open, shorted to power or ground.
  • Another cause could be a faulty or intermittent connection at the Powertrain Control Module (PCM).
  • Lastly, a faulty or intermittent connection at the Anti-Lock Brake Module (ABS) can also trigger the u1123 fault code.

To fix the u1123 automobile fault code, check the possible causes and inspect the wiring harness, connectors, and components for damage.

  • To fix the automobile fault code u1123, first, check the possible causes listed above.
  • Then, visually inspect the related wiring harness and connectors.
  • Look for damaged components and check for broken, bent, pushed out, or corroded connector’s pins.
  • This fix will take an estimated repair time of 1.0 hour.

The automobile fault code U1123 can be diagnosed and fixed within an estimated repair time of 1.0 hour. The cost of repair is influenced by the repair time, which is commonly charged between $75 and $150 per hour by most auto repair shops. Therefore, the total cost of fixing the U1123 fault code will depend on the hourly rate charged by the repair shop and the estimated repair time required to fix the issue.

The automobile fault code U1123 indicates a communication problem between the Powertrain Control Module (PCM) and other controllers on the bus network. This fault code occurs when the PCM is unable to communicate with any other controller on the bus network while the ignition switch is in the RUN position.

This communication failure can lead to various issues, including engine performance problems, transmission issues, and other related problems.

If you encounter this fault code, it is essential to diagnose and fix the communication problem to ensure the proper functioning of your vehicle.

What are the possible causes of the u1123 automobile fault code?

The u1123 automobile fault code can be caused by a faulty or intermittent vehicle speed sensor or connections, J1850/SCP/CAN Bus wiring intermittently open, shorted to power or ground, faulty or intermittent connection at the Powertrain Control Module (PCM), or faulty or intermittent connection at the Anti-Lock Brake Module (ABS). To fix the issue, one should visually inspect the related wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

How can I visually inspect the related wiring harness and connectors to fix the u1123 fault code?

To fix the u1123 fault code, start by checking the possible causes, which include faulty or intermittent vehicle speed sensor, J1850/SCP/CAN Bus wiring intermittently open, shorted to power or ground, faulty or intermittent connection at the Powertrain Control Module (PCM), and faulty or intermittent connection at the Anti-Lock Brake Module (ABS). Then, visually inspect the related wiring harness and connectors for any damaged components, broken, bent, pushed out, or corroded connector’s pins.

What are the specific steps to check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins to fix the u1123 fault code?

To fix the u1123 fault code, first check the possible causes, including faulty or intermittent vehicle speed sensor or connections, J1850/SCP/CAN Bus wiring intermittently open, shorted to power or ground, faulty or intermittent connection at the Powertrain Control Module (PCM), and faulty or intermittent connection at the Anti-Lock Brake Module (ABS). Then, visually inspect the related wiring harness and connectors, checking for damaged components and looking for broken, bent, pushed out, or corroded connector’s pins.

u1123 error fault code explained

To fix u1123, check for faulty or intermittent connections at the vehicle speed sensor, J1850SCPCAN Bus wiring, PCM, and ABS.

Visually inspect wiring harness and connectors for damage, broken, bent, pushed out, or corroded pins.

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