CARRIER 1T0591 - Caterpillar

Table 1 lists the diagnostic trouble codes for the Aftertreatment Identification Module.Clear all "Active" codes using Cat ET before proceeding with the following procedure. Refer to Troubleshooting, "Diagnostic Capabilities - Clearing Active Codes for On Board Diagnostics (OBD)" for more information on clearing "Active" codes.
Table 1
Diagnostic Trouble Codes    
CDL Code    J1939 Code    Code Description
(code descriptions may vary)    Comments    
3468-2     5576-2     Aftertreatment #1 Identification Number Module: Erratic, Intermittent, or Incorrect     The installed Clean Emissions Module (CEM) is not a certified match with the engine.
The code is a confirmed emissions regulation violation. A financial penalty and/or legal action may result, if the problem is not corrected immediately. Do not operate the engine with the active fault.
Engine power is derated.    
3468-8     5576-8     Aftertreatment #1 Identification Number Module: Abnormal Frequency Pulse Width or Period     Emissions do not conform to regulations. Do not continue to operate the engine with the active fault.
Engine power is derated.    
Follow the troubleshooting procedure in order to identify the root cause of the problem.    
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check for Diagnostic Trouble Codes
A. Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM). Refer