P2823 Pressure Control Solenoid J Intermittent

P2823 is reserved for a fault at valve J that appears and disappears, either in its wiring or in its hydraulic action. No manufacturer publishes a description of this code. CARB 13 CCR 1968.2 obliges makers to monitor transmission output devices for circuit and functional faults, yet leaves it to them whether to split off intermittent codes. The systems that do use the J series show why such faults are elusive: GM's 2020 circuit tests need the flag in 0.3 of every 0.5 s, and the 2023 Corvette waits 150 ms before confirming a J fault, so very brief dropouts may never be logged and only appear as an odd shift or a park lock that reacts late. Read the freeze frame, flex the harness at the transmission plug with live data running and inspect pins for corrosion or spread contacts.

Likely causes

Symptoms

• Occasional rough or unexpected shift
• Warning that comes and goes
• Sometimes delayed park lock response

Repair estimate

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

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.