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Diagnostic Trouble Code (DTC) index

DIAGNOSTIC TROUBLE CODE INDEX

DTC Description Possible Source Action
P1609 ECM microprocessor to microprocessor communication failure
  • ECM flash communication control port (FCCP) circuit: short circuit to ground
  • ECM failure
 For ECM FCCP circuit tests, GO to PINPOINT TEST G289831p20  .
P1611 ECM central processor 2 failure
  • ECM failure
 Possible module failure.
P1633 ECM central processor 1 memory failure
  • ECM failure
 Possible module failure.
P1634 Throttle 'watchdog' circuit malfunction
  • ECM failure
 Possible module failure.
P1637 CAN ABS/TCCM token missing
  • CAN open circuit fault - ABS/TCCM to ECM
  • CAN short circuit fault
  • ABS/TCCM failure
  • ECM failure
 For CAN open circuit tests, GO to PINPOINT TEST G289831p16  . For CAN short circuit tests, GO to PINPOINT TEST G289831p17  . Possible module failure.
P1638 CAN IC token missing
  • CAN open circuit fault - IC to ECM
  • CAN short circuit fault
  • IC failure
  • ECM failure
 For CAN open circuit tests, GO to PINPOINT TEST G289831p16  . For CAN short circuit tests, GO to PINPOINT TEST G289831p17  . Possible module failure.
P1642 CAN circuit malfunction
  • CAN short circuit fault
  • Control module failure - check for additional logged DTCs to locate control module source
 For CAN short circuit tests, GO to PINPOINT TEST G289831p17  . Possible module failure.
P1643 CAN TCM token missing
  • CAN open circuit fault - TCM to ECM
  • CAN short circuit fault
  • TCM failure
  • ECM failure
 For CAN open circuit tests, GO to PINPOINT TEST G289831p16  . For CAN short circuit tests, GO to PINPOINT TEST G289831p17  . Possible module failure.
P1648 ECM knock sensor self-test failure
  • ECM failure
 Possible module failure.
P1649 ECM flash programming circuit malfunction
  • ECM to DLC circuit: short circuit to ground
  • ECM to DLC circuit: short circuit to B+
 For ECM FCCP circuit tests, GO to PINPOINT TEST G289831p20  .
P1656 Throttle position sensor amplifier circuit malfunction
  • ECM failure
 Possible module failure.
None SCP circuit malfunction
  • Short circuit fault in SCP network
 For SCP circuit tests, GO to PINPOINT TEST G289831p18  .
None ISO circuit malfunction
  • Short circuit fault in ISO network
 For ISO circuit tests, GO to PINPOINT TEST G289831p19  .
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