Powertrain, generic · Transmission

P0963 Pressure Control Solenoid A Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Pressure control solenoid A circuit high: the driver detects a short to voltage, and on GM's six-speeds also an open circuit, since those units have no separate open code. The Saab 9-4X 6T70 (line pressure solenoid) sets it after 5 s as Type B, GM's 2018 table after 4.4 of 5 s over two trips; the module then commands maximum line pressure and freezes adaptations. Ford tests its line pressure (EPC) solenoid for short to power and, in some applications, keeps P0963 like P0960 without MIL because maximum line pressure does not raise emissions. GM's 8-, 9- and 10-speeds and Allison 1000 (power short within 75 ms) use A for a clutch or main modulation solenoid. Expect firm, harsh shifts rather than slipping. Siblings: P0960, P0961, P0962.

Likely causes

Open coil or high-resistance connection (reported as high on GM six-speeds)
Control wire shorted to a supply voltage
Damaged or contaminated connector at the transmission
Faulty output stage in the control module

Symptoms

  • Firm or harsh shifts at maximum line pressure
  • Warning light, on some vehicles only after two drives or not at all
  • Shift adaptation no longer improves

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,800
Time1–5 h

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

Parts involved

pressure control solenoid awiring harnesstcm

Related codes

P0960P0961P0962P0967P0971P0748

References: saabwisonline.com, gsi.ext.gm.com, newtonnet.co.uk.