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Accessory Protocol Interface Module (APIM)

ACCESSORY PROTOCOL INTERFACE MODULE (APIM) DTC CHART

DTC Description Action
B1252:04 USB Port: System Internal Failure GO to PINPOINT TEST R .
B1252:11 USB Port: Circuit Short to Ground GO to PINPOINT TEST R .
B12B8:04 USB Port #2: System Internal Failure
NOTE: This DTC refers to USB port #2 on the APIM itself, which is not used.
  • INSPECT the APIM USB port #2 for damage and REMOVE any debris.
  • CLEAR the DTCs.
  • WAIT at least 10 seconds.
  • REPEAT the self-test.
  • If DTC B12B8:04 is retrieved again, REFER to APIM HARDWARE TESTING .
B12B8:11 USB Port #2: Circuit Short To Ground
NOTE: This DTC refers to USB port #2 on the APIM itself, which is not used.
  • INSPECT the APIM USB port #2 for damage and REMOVE any debris.
  • CLEAR the DTCs.
  • WAIT at least 10 seconds.
  • REPEAT the self-test.
  • If DTC B12B8:11 is retrieved again, REFER to APIM HARDWARE TESTING .
B1D79:01 Microphone Input: General Electrical Failure GO to PINPOINT TEST P .
B1D79:11 Microphone Input: Circuit Short To Ground GO to PINPOINT TEST P .
B1D79:12 Microphone Input: Circuit Short To Battery GO to PINPOINT TEST P .
B1D79:13 Microphone Input: Circuit Open GO to PINPOINT TEST P .
U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information GO to PINPOINT TEST W .
U0140:00 Lost Communication With Body Control Module: No Sub Type Information GO to PINPOINT TEST Y .
U0151:00 Lost Communication With Restraints Control Module: No Sub Type Information GO to PINPOINT TEST Z .
U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information GO to PINPOINT TEST AB .
U016A:00 Lost Communication With Global Positioning System Module: No Sub Type Information GO to PINPOINT TEST AD .
U0184:00 Lost Communication With Radio: No Sub Type Information GO to PINPOINT TEST AE .
U0422:00 Invalid Data Received From Body Control Module: No Sub Type Information RETRIEVE and FOLLOW DTCs present in the BCM. REFER to MULTIFUNCTION ELECTRONIC MODULES .
U0423:00 Invalid Data Received from Instrument Panel Cluster Control Module: No Sub Type Information RETRIEVE and FOLLOW DTCs present in the IPC. REFER to INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES .
U2100:00 Initial Configuration Not Complete: No Sub Type Information
  • This DTC sets due to incomplete or incorrect PMI procedures. CHECK the vehicle service history for recent service actions related to the APIM.
  • If there have been recent service actions with the APIM, REPEAT/PERFORM the APIM programming as directed by the diagnostic scan tool. REFER to ACCESSORY PROTOCOL INTERFACE MODULE (APIM) PROGRAMMING .
  • If there have been no recent service actions, REFER to APIM HARDWARE TESTING .
U2101:00 Control Module Configuration Incompatible: No Sub Type Information
  • This DTC sets due to incomplete or incorrect PMI procedures. CHECK the vehicle service history for recent service actions related to the APIM.
  • If there have been recent service actions with the APIM, REPEAT/PERFORM the APIM programming as directed by the diagnostic scan tool. REFER to ACCESSORY PROTOCOL INTERFACE MODULE (APIM) PROGRAMMING .
  • If there have been no recent service actions, REFER to APIM HARDWARE TESTING .
U3000:04 Control Module: System Internal Failure GO to PINPOINT TEST M .
U3000:41 Control Module: General Checksum Failure
  • CLEAR the DTC.
  • WAIT at least 10 seconds.
  • REPEAT the self-test.
  • If DTC U3000:41 is retrieved again, REFER to APIM HARDWARE TESTING .
U3000:42 Control Module: General Memory Failure
  • CLEAR the DTC.
  • WAIT at least 10 seconds.
  • REPEAT the self-test.
  • If DTC U3000:42 is retrieved again, REFER to APIM HARDWARE TESTING .
U3000:88 Control Module: Bus Off
NOTE: Network communication/message DTCs can result from intermittent concerns such as damaged wiring or low battery voltage occurrences. Additionally, vehicle repair procedures such as module reprogramming often set these DTCs. Replacing a module to resolve a network DTC is unlikely to resolve the concern. The module was unable to communicate on the network at a point in time. The fault is not currently present.

To avoid repeat network concerns:

  • INSPECT for damaged or corroded wiring at the APIM.
  • TEST the vehicle battery. REFER to Charging Systems in CHARGING SYSTEM .
  • CLEAR the DTC.
  • REPEAT the network test with the diagnostic scan tool.
U3003:16 Battery Voltage: Circuit Voltage Below Threshold GO to PINPOINT TEST AH .
U3003:17 Battery Voltage: Circuit Voltage Above Threshold GO to PINPOINT TEST AI .
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