Code 86, Low Gear Ratio: Notes

The shift solenoids are used inside the valve body to control spool valves, which determine the transmission gear.

Fused ignition power is supplied to solenoid "B", also referred to as 2-3 shift solenoid. PCM/TCM engages solenoid "B" by grounding circuit No. 1223.

Code 86 will set under the following conditions.

• Vehicle speed is greater than 7 MPH.
• TPS is more than 25 percent.
• PCM/TCM commands 1st or 2nd gear.
• Transmission ratio indicates transmission is in 3rd or 4th gear.
• Conditions are met for 6 seconds.
  NOTE: Test numbers refer to numbers on diagnostic chart.

1. This test determines whether transmission is receiving a solenoid "B" on command.