P0974 on Chevrolet
Shift Solenoid 'A' Control Circuit High
P0974 on Chevrolet vehicles indicates shift solenoid 'a' control circuit high. Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 2500HD. The shift solenoid 'A' control circuit voltage is above the expected range (too high / open or shorted to power). Typical repair costs on Chevrolet range from $300 to $2,500, depending on the specific model and root cause.
Common Causes of P0974
- •Solenoid circuit open or shorted to voltage
- •Faulty shift solenoid A
- •Corroded/damaged connector
- •Internal TCM fault
P0974 on Chevrolet by Model
Chevrolet Silverado 2500HD(1 issue)
- Allison 1000 Shift Solenoid Fault and Limp Mode (P0700 With Solenoid Sub-Code)2001-2019
Separate from the well-known torque converter shudder, the Allison 1000 in these trucks is documented for shift solenoid faults that drop the transmission into limp mode. The TCM sets P0700 - a generic 'transmission fault' pointer - accompanied by a specific solenoid code such as P0871 or P0872 (shift solenoid E stuck / on when commanded off). When that code sets, the transmission falls to hydraulic default, the TCM inhibits torque converter clutch engagement, and the truck is left in a single gear, usually third, sometimes refusing to move at all until it is restarted. On a loaded 2500HD this strands the truck. Forum diagnosis repeatedly finds the cause outside the solenoid itself: low or burnt fluid, a loose battery ground, or a chafed harness behind the transmission.
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View P0974 across all makes →Frequently Asked Questions
What does P0974 mean on Chevrolet?▼
P0974 stands for "Shift Solenoid 'A' Control Circuit High." The shift solenoid 'A' control circuit voltage is above the expected range (too high / open or shorted to power). On Chevrolet specifically, this code is documented across 1 model.
What causes P0974 on Chevrolet vehicles?▼
Common causes on Chevrolet: Solenoid circuit open or shorted to voltage, Faulty shift solenoid A, Corroded/damaged connector, Internal TCM fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0974 on a Chevrolet?▼
Repair costs on Chevrolet range from $300 to $2,500, depending on the specific model and root cause.
Which Chevrolet models have P0974 documented?▼
Au7o has documented P0974 on 1 Chevrolet model: Silverado 2500HD.