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Home >> GMC >> 2019 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 360 (Automatic Transmission - 10L60 (MQA) Or 10L80 (MHU) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P18A1, P18AA, P18AB, or P27EC >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
Component DTC Condition
Transmission Control Solenoid Valve 8 P18A1, P18AA, P18AB, P27EC Binding or Sticking/Stuck

Control Valve Body

  • Electronic Transmission Range Select (ETRS) Valve
 P18A1, P18AA, P18AB, P27EC
  • Oil Channels or Orifices - Blocked by debris/Restricted
  • Valve - Binding or Sticking/Stuck
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