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Table 1
Diagnostic Trouble Codes
J1939 Code CDL Code Code Description
(code descriptions may vary) Comments
5576-2 3468-2 Aftertreatment #1 Identification : Erratic, Intermittent, or Incorrect The installed Clean Emissions Module (CEM) #1 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.
5576-8 3468-8 Aftertreatment #1 Identification : 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.
5577-2 3469-2 Aftertreatment #2 Identification : Erratic, Intermittent, or Incorrect The installed Clean Emissions Module (CEM) #2 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.
5577-8 3469-8 Aftertreatment #2 Identification : 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. Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Diagnostic Trouble Codes
A. Establish communication between Cat® Electronic Technician (ET) and the Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
Diagnostic Trouble Codes
Result: A 3468-2, 3468-8, 5576-2, 5576-8, 3469-2, 5577-2, 3469-8, or 5577-8, diagnostic code is active.
Proceed to Test Step 2.
Illustration 1 g02896037
Typical CEM identification plate
Illustration 2 g03766279
CEM (typical)
(1) Typical location of CEM identification plate
Table 3
Troubleshooting Test Steps Values Results
2. Manually Enter the Aftertreatment Identification Information
The CEM identification plate is on the electronics panel.
Factory Passwords are required for this procedure.
A. Confirm that a certified CEM is installed on the engine.
Contact your local Caterpillar dealer for a list of approved CEM and RF configurations for your engine.
B. Record the affected CEM serial number and the configuration group from the CEM Identification Plate.
C. Verify that the affected CEM is a certified match with the engine.
Contact a Caterpillar technical communicator, if necessary.
Certified Match
Result: The affected CEM is a certified match with the engine.
Proceed to Test Step 3.
Result: The affected CEM is not a certified match for the engine.
Repair: Remove the affected CEM and replace the affected CEM with a certified match for the engine. Refer to Disassembly and Assembly for removal and installation procedures. When the new CEM is installed, the"Aftertreatment Identification Number Module" will begin communicating with the ECM and the diagnostic code will be cleared.
When determining if a CEM is a certified match:
The engine ECM will only communicate with the CEM if the total lifetime hours of the engine are less than 100. If the hours are greater than 100, the information from the CEM identification plate must be programmed into the ECM by using Cat ET.
Illustration 3 g03336675
Table 4
Troubleshooting Test Steps Values Results
3. Aftertreatment Configuration
A. Establish communication between Cat ET and the affected ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Navigate to the "Aftertreatment Configuration" in the affected "Engine Aftertreatment Controller" page.
C. Program the required "Factory Installed Aftertreatment Identification Number" with the serial number from the CEM Identification Plate.
CEM Configuration
Result: The diagnostic code is automatically cleared.
Return to service.