P0748 on Cadillac
Pressure Control Solenoid "A" Electrical
P0748 on Cadillac vehicles indicates pressure control solenoid "a" electrical. Au7o has documented this code across 1 Cadillac model — most commonly on Escalade. P0748 is a generic powertrain code meaning the transmission control module has detected an electrical fault — voltage or resistance out of the expected range — in the circuit for pressure control solenoid "A". This solenoid regulates hydraulic line pressure inside an automatic transmission, adjusting how firmly the clutches and bands apply based on speed, load, and throttle position. When the computer can't control the solenoid electrically, the transmission often defaults to maximum line pressure or limp mode, so you may feel harsh or erratic shifts, slipping, delayed engagement when shifting into Drive, or being locked into a single gear. Because it is an electrical-circuit code, the fault is usually in the solenoid itself or its wiring rather than a purely hydraulic problem, though contaminated fluid can damage the solenoid. Continuing to drive with slipping and overpressure shifts can overheat the transmission and lead to expensive internal damage, so this should be repaired promptly. Typical repair costs on Cadillac range from $2,200 to $3,500, depending on the specific model and root cause.
Common Causes of P0748
- •Failed pressure control solenoid A (open or shorted solenoid windings)
- •Damaged, frayed, or shorted wiring in the solenoid circuit, including the transmission case connector
- •Corroded or loose electrical connectors at the transmission harness
- •Low, dirty, or contaminated transmission fluid degrading or sticking the solenoid
- •Clogged transmission filter or debris in the valve body hydraulic passages
- •Faulty transmission control module or PCM driver circuit (rare)
P0748 on Cadillac by Model
Cadillac Escalade(1 issue)
- 4L60E/4L65E 3-4 Clutch Pack Burnup Causes Loss of Third and Fourth Gear2002-2006
GMT800-era Escalades use the 4L60E/4L65E four-speed behind the 6.0L LQ9/LQ4, and in a 5,800-pound SUV the 3-4 clutch pack is the component that gives out. The 3-4 clutch apply circuit runs through a small feed and the waved snap ring and clutch plates cook under sustained load - towing, hills, or just the vehicle's weight over time. It usually starts as a flare or slip on the 2-3 shift, then the transmission stops making 3rd and 4th entirely and drives only in 1st and 2nd (or goes to limp with no movement at all). The sun shell ('Beast' shell) splintering is the other classic failure and produces loss of reverse and 2nd/4th. CarComplaints lists 'Transmission Failure' as the #1 problem on both the 2005 Escalade (avg $2,800 at 79,000 mi) and the 2006 Escalade (avg $2,800 at 77,000 mi), which is early-life failure for a truck transmission. This is a separate failure from the later 8L90 and 10-speed shift-quality complaints.
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What does P0748 mean on Cadillac?▼
P0748 stands for "Pressure Control Solenoid "A" Electrical." P0748 is a generic powertrain code meaning the transmission control module has detected an electrical fault — voltage or resistance out of the expected range — in the circuit for pressure control solenoid "A". This solenoid regulates hydraulic line pressure inside an automatic transmission, adjusting how firmly the clutches and bands apply based on speed, load, and throttle position. When the computer can't control the solenoid electrically, the transmission often defaults to maximum line pressure or limp mode, so you may feel harsh or erratic shifts, slipping, delayed engagement when shifting into Drive, or being locked into a single gear. Because it is an electrical-circuit code, the fault is usually in the solenoid itself or its wiring rather than a purely hydraulic problem, though contaminated fluid can damage the solenoid. Continuing to drive with slipping and overpressure shifts can overheat the transmission and lead to expensive internal damage, so this should be repaired promptly. On Cadillac specifically, this code is documented across 1 model.
What causes P0748 on Cadillac vehicles?▼
Common causes on Cadillac: Failed pressure control solenoid A (open or shorted solenoid windings), Damaged, frayed, or shorted wiring in the solenoid circuit, including the transmission case connector, Corroded or loose electrical connectors at the transmission harness, Low, dirty, or contaminated transmission fluid degrading or sticking the solenoid, Clogged transmission filter or debris in the valve body hydraulic passages. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0748 on a Cadillac?▼
Repair costs on Cadillac range from $2,200 to $3,500, depending on the specific model and root cause.
Which Cadillac models have P0748 documented?▼
Au7o has documented P0748 on 1 Cadillac model: Escalade.