Powertrain, generic · Transmission

P097A Shift Solenoid A Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Open-circuit fault in the drive circuit of shift solenoid A, a code that later J2012 editions added; older lists still show P097A as reserved. GM is the only maker found that documents it: the 2022 to 2025 tables for the Allison 1000 six-speed in its heavy-duty trucks call it Shift Solenoid 1 Control Circuit Open. After one hardware fault the module flags pending, and after three samples it opens the low-side driver as a test; three more open readings at 9 to 18 V set the code (120 ms, MIL after one trip). The same gearbox once used P0972 for this and P0973 in 2016. Ford reports an open SSA as P0750, GM six-speeds as P0974, and Genesis folds all electrical faults of A into P0753.

Likely causes

Open coil of shift solenoid 1/A
Unplugged, corroded or pushed-out pin at the transmission connector
Broken wire in the internal or external transmission harness
Faulty low-side driver in the control module

Symptoms

  • MIL on after one faulty trip
  • Transmission in a fixed default gear
  • Shifts involving solenoid A missing

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time1–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

shift solenoid awiring harnesstcm

Related codes

P0972P0973P0974P0750P2669

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.