P185F - Transfer Case Shift Pending Signal Not Plausible

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Engine Control Module (ECM)
  • Engine Control Module (ECM) harness is open or shorted
  • Engine Control Module (ECM) circuit poor electrical connection

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P185f Description

The Engine Control Module (ECM) uses the following two ways to determine if the transfer case is in 4WD Low, 4WD High or Neutral.

1. The first way is to compare the transmission output speed sensor to the transfer case output speed sensor in order to calculate transfer case range.

2. The second way is to use a LAN message sent by the transfer case shift control module to the ECM.

The ECM uses this message to determine motor torque required and transmission shifting.

The internal fault detection is handled inside the control module. No external circuit diagnosis is involved.

OBDII Code P185f - Transfer Case Shift Pending Signal Not Plausible - AutoCodes.com

P185F Information for specific makes

  • P185F BUICK Transfer Case Shift Pending Signal Not Plausible
  • P185F CADILLAC Transfer Case Shift Pending Signal Not Plausible
  • P185F CHEVROLET Transfer Case Shift Pending Signal Not Plausible
  • P185F GMC Transfer Case Shift Pending Signal Not Plausible

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P185F Comments

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