P1781

Ignition Retard Request Duration Fault

DTC P1781, sometimes indicated as P178100 is an OBD diagnostic trouble code indicating a manufacturer-specific fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the transmission (gearbox) causing ignition retard request duration fault.

  • P1781: Ignition Retard Request Duration Fault
  • P1781 00: CAN data bus, ECM actual torque signal - malfunction detected

DTC Trouble Code Search
Bulletins

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

  • 050601030 - ENGINE AND ENGINE COOLING
    CHEVROLET: 1.6l l91 intermittent misfire cold during deceleration or steady state highway driving after cold start with dtc's P0300, P0700, P1781 and/or U0401 set (replace valves and valve stem seals) *tt updated 11/02/07 *nj
  • 3064 - ENGINE AND ENGINE COOLING
    CHEVROLET: Service engine soon light engine misfire and P1781 diagnostic trouble code. *eh
  • 3094 - ELECTRICAL SYSTEM
    CHEVROLET: Allison lct 1000 P1781 or P0802 setting in the electronic control module. (2005 chevrolet kodiak and 2005 gmc top kick) *sc
  • 3064 - ENGINE AND ENGINE COOLING:ENGINE
    CHEVROLET: Service engine soon light and rough running with diagnostic trouble codes P0700, P1781 and possibly a P0300. *tt
  • 01575 - ENGINE AND ENGINE COOLING:ENGINE
    CHEVROLET: Diagnostic trouble code (dtc) P1781 diagnostic is not in si yet. Poor fuel economy and/or harsh transmission shifts. Sit bulletin 1413084. *mn
  • 181200 - UNKNOWN OR OTHER
    CHEVROLET: Information on vehicles exhibiting diagnostic trouble code P1781. *tt
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