The OBD code U1104 for Toyota indicates a fault in the Controller Area Network (CAN) communication system related to the Driving Support ECU.
Symptoms include the Engine Light being ON.
The issue can be caused by a faulty Driving Support ECU, open/shorted harness, or poor electrical connection.
It is essential to visually inspect wiring harnesses, connectors, and components for damage or corrosion.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the Toyota u1104 OBD Code
The vehicle displays erratic behavior and warning lights with Toyota U1104 fault code.
- Symptoms: Service Engine Soon Warning Light may illuminate.
- Vehicle may experience communication issues with the gateway module.
- Steering wheel controls may not function properly.
Causes of the Toyota u1104 OBD Code
Possible reasons for Toyota U1104 include communication issues within the vehicle’s network system.
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- U1104 can be caused by a faulty Controller Area Network (CAN) Communication System.
- A faulty Driving Support ECU.
- An open or shorted Driving Support ECU harness.
- Or a poor electrical connection in the Driving Support ECU circuit.
Fixing Toyota Error Code u1104 Step By Step
Address the communication issue between the vehicle’s gateway module and the engine control module.
- To fix the Toyota OBDII code U1104, start by reviewing the possible causes mentioned above.
- Visually examine the wiring harness and connectors related to the ABS control module.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- If no issues are found with the wiring and connectors, consider resetting the ABS control module using a diagnostic scan tool.
- If the problem persists after resetting, the ABS control module may need to be replaced with a new one to resolve the U1104 fault code.
Cost Of Fixing Toyota u1104 Fault Code
The repair for Toyota U1104 may involve diagnosing and fixing issues with the communication network.
The cost to diagnose and fix Toyota OBD code U1104 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. The final cost may vary based on shop rates and the complexity of the diagnostic and repair process.
Details of the Toyota u1104 OBD Code
The Toyota U1104 code indicates a loss of communication with the fuel pump control module.
OBD code U1104 for Toyota vehicles indicates a communication error between the Engine Control Module (ECM) and the Restraints Control Module (RCM).
This code is triggered when the ECM does not receive the expected data or signals from the RCM.
The RCM is responsible for managing the vehicle’s restraint systems, such as airbags and seatbelt pretensioners.
The communication error can be caused by wiring issues, faulty modules, or poor connections between the ECM and RCM.
Mechanic’s Tech Notes
For Toyota U1104 code, this section provides detailed diagnostic and repair information for technicians.
To diagnose and fix OBDII code U1104 in a Toyota, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) network with a scan tool.
If the TCM does not respond, reprogramming or reflashing may be necessary.
Visually inspect the wiring harness and connectors for any damage, and check connector pins for signs of being broken, bent, pushed out, or corroded.
This thorough inspection can help identify and address potential issues causing the U1104 fault code.
FAQ
OBD code U1104 in a Toyota indicates an issue with the Controller Area Network (CAN) communication system. Check for faults in the Driving Support ECU and related wiring.
Diagnose code U1104 in your Toyota by checking for faulty CAN communication system, Driving Support ECU issues, and inspecting wiring harness and connectors for damage.
Code U1104 in a Toyota may cause the Engine Light to come on due to issues with the CAN system or Driving Support ECU. Check wiring and connectors for damage.
Wrap Up
If your Toyota is displaying OBD code U1104, you may experience issues with the ABS system, such as erratic wheel speed readings due to faulty wheel speed sensors, damaged wiring harnesses, or poor connections at the ABS control module.
To address Toyota U1104, inspect the wheel speed sensors for damage or contamination, check the wiring harness for any visible issues, and ensure secure connections at the ABS control module.
Replace any faulty sensors or repair damaged wiring as needed to resolve the ABS system problem.
