Powertrain, generic · Transmission

P073D Unable to Engage Neutral

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P073D means neutral is commanded but not reached or not held. GM uses it on vehicles with electronic gear selection (shift-by-wire, e.g. Cadillac XT4): the selector or engine module compares commanded and actual range from the range sensor and flags it after 1.8–2 s in the selector module or 10 s in the engine module, after two trips. For Ford's 6F35 the supplier Sonnax describes a mechanical cause: a forward or direct clutch dragging in neutral, visible as turbine speed staying only 200–400 rpm below engine speed. The car may creep in N; range changes may be locked. The opposite, stuck in neutral, is P072A.

Likely causes

Ford 6F35: forward or direct clutch dragging (balance piston, plates, seal)
Shift-by-wire: range actuator or park module, range sensor or its calibration
Valve body (manual valve, missing check ball, sticking solenoid)
CAN communication or control module

Symptoms

  • Vehicle creeps in N or engine is loaded when shifting to N
  • N selection not accepted, warning message
  • Harsh engagement N to D/R (6F35)
  • Check engine light after two trips (GM)

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–3,500
Time1–12 h

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

Parts involved

transmission range selectortransmission range sensortransmission clutchestransmission control module

Related codes

P072AP073EP0705P0706P0730

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