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Symptom: P0891-TRANSMISSION RLY ALWAYS ON When Monitored and Set Condition: P0891-TRANSMISSION RLY ALWAYS ON When Monitored: When the ignition is turned from the 9off9 position to the 9run9 position and/or the ignition is turned from the 9crank9 position to the 9run9 position. Set Condition: This DTC set if the Transmission Control Module (TCM) senses greater than 3 volts at the Transmission Control Relay Output circuits at the TCM prior to the POSSIBLE CAUSES TRANSMISSION CONTROL RELAY STUCK CLOSED TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO VOLTAGE TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO VOLTAGE POWERTRAIN CONTROL MODULE INTERMITTENT WIRING AND CONNECTORS TEST ACTION APPLICABILITY 1 NOTE: Low fluid level can be the cause of many transmission problems. If t, read Engine DTC’s. Check and repair all Engine DTC’s prior to performing any transmission symptom diagnostics. t, read Transmission DTC’s. Record all DTC’s and 1 Trip Failures. NOTE: Diagnose 1 Trip Failures as a fully matured DTC. All Continue 136 TRANSMISSION - NGC |