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DTC P0891 At Relay - Open Circuit: DTC Detecting Condition

WARNING: This page is about a different car, the 2007 Kia Optima, 2007 Kia Magentis, 2006 Kia Optima, and 2006 Kia Magentis. However, it is still accessible from the selected car via links, so may be relevant.
DTC CHART

Item Detecting Condition Possible cause
DTC Strategy 
  • Check voltage range
  • Open or short in circuit
  • Faulty A/T control relay
  • Faulty PCM/TCM
Enable Conditions 
  • 16V > Voltage Battery >11V
  • Time after TCM turns on > 0.5sec
Threshold value 
  • Feedback Voltage ≥ 20V
Diagnostic Time 
  • 2 seconds
Fail Safe 
  • Locked in 3rd gear. (control relay off)
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