U1136 – Lost Communication with Instrument Panel Cluster (IPC) Module.

The ODBII code U1136 indicates a loss of communication between the vehicle’s onboard computer and the Instrument Panel Cluster (IPC) module, which may affect the functionality of the dashboard displays and warning lights.

The severity of ODBII code U1136 is generally considered moderate to severe.

Common Causes For: U1135 SCP (J1850) Invalid or Missing Data for Ignition Switch / Starter

• Faulty Instrument Panel Cluster (IPC) module
• Damaged wiring or connectors
• Poor ground connection
• Faulty communication network (CAN bus)
• Corroded or loose connectors
• Software issues or programming errors
• Malfunctioning body control module (BCM)
• Battery voltage issues

Common misdiagnosis for U1136 Lost Communication with Instrument Panel Cluster (IPC) Module.

• Faulty Instrument Panel Cluster (IPC) Module
• Wiring issues or damaged connectors
• Faulty Body Control Module (BCM)
• Power supply issues
• Faulty or corroded ground connections
• Software or firmware issues
• Faulty CAN bus communication
• Issues with other modules communicating on the network
• Battery or charging system problems
• Faulty ignition switch

Common Troubleshooting Steps

When dealing with the OBD-II code U1136, which indicates “Lost Communication with Instrument Panel Cluster (IPC) Module,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors related to the IPC for any signs of damage, corrosion, or loose connections.
• **Connector Pins: Ensure that the pins in the connectors are not bent or corroded.
• Check the IPC Module: **Functionality: Verify that the IPC is functioning correctly. If possible, test the IPC in another vehicle or replace it with a known good unit to see if the problem persists.
• **Power and Ground: Ensure that the IPC is receiving the correct power and ground signals. Use a multimeter to check voltage and ground continuity.
• Inspect the CAN Bus System: **Communication Lines: The IPC communicates over the Controller Area Network (CAN) bus. Check the CAN bus wiring for shorts, opens, or damage.
• **Termination Resistors: Ensure that the CAN bus has the proper termination resistors in place. A missing or faulty resistor can cause communication issues.
• Check for Interference: Look for any aftermarket devices or modifications that may interfere with the IPC’s communication, such as alarms, stereo systems, or other electronic devices.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the vehicle’s electronic systems. Reconnect the battery and see if the code reappears.
• Update or Reprogram the IPC: In some cases, the IPC may require a software update or reprogramming. Check with the manufacturer or a dealership for any available updates.
• Scan Tool Communication: Use a professional scan tool to check if you can communicate with the IPC. If you cannot, it may indicate a problem with the IPC itself or the communication lines.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the IPC or communication issues for your specific vehicle make and model. Manufacturers may have issued guidance on common problems.
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s specific systems. By following these steps, you should be able to identify the root cause of the U1136 code and take appropriate action to resolve the communication issue with the Instrument Panel Cluster.