P0766 on Ford
Shift Solenoid D Performance/Stuck Off
P0766 on Ford vehicles indicates shift solenoid d performance/stuck off. Au7o has documented this code across 1 Ford model — most commonly on Fiesta. This code means the Transmission/Powertrain Control Module detected that Shift Solenoid 'D' is performing poorly or appears stuck in the off position. Shift solenoids direct hydraulic fluid inside the transmission to engage the proper gears or apply the torque converter clutch, and the module monitors whether commanded shifts actually occur. P0766 sets when solenoid D isn't producing the expected result — the gear change tied to it doesn't happen correctly. This can cause harsh or missed shifts, slipping, or being stuck in a gear, sometimes triggering limp mode.
Common Causes of P0766
- •Stuck or failed shift solenoid D
- •Low or contaminated transmission fluid
- •Clogged solenoid screen or valve body passage
- •Open, shorted, or corroded solenoid wiring/connector
- •Valve body wear or sticking spool valve
- •Internal hydraulic leak affecting the solenoid circuit
- •Faulty TCM/PCM solenoid driver
P0766 on Ford by Model
Ford Fiesta(1 issue)
- DPS6 PowerShift Dual-Clutch Transmission Shudder, Slipping, and Failure2011-2019
The Ford Fiesta equipped with the DPS6 PowerShift dual-clutch automatic transmission is one of the most complained-about vehicles in recent history. The dry dual-clutch design causes severe shuddering, jerking, hesitation, and complete loss of power during acceleration. The clutch plates overheat and wear prematurely, often before 50,000 miles. The Transmission Control Module (TCM) software frequently fails to adapt properly, causing delayed shifts, harsh engagement, and rollback on hills. Ford faced a class-action lawsuit involving nearly 1.5 million vehicles and a federal settlement was reached.
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View P0766 across all makes →Frequently Asked Questions
What does P0766 mean on Ford?▼
P0766 stands for "Shift Solenoid D Performance/Stuck Off." This code means the Transmission/Powertrain Control Module detected that Shift Solenoid 'D' is performing poorly or appears stuck in the off position. Shift solenoids direct hydraulic fluid inside the transmission to engage the proper gears or apply the torque converter clutch, and the module monitors whether commanded shifts actually occur. P0766 sets when solenoid D isn't producing the expected result — the gear change tied to it doesn't happen correctly. This can cause harsh or missed shifts, slipping, or being stuck in a gear, sometimes triggering limp mode. On Ford specifically, this code is documented across 1 model.
What causes P0766 on Ford vehicles?▼
Common causes on Ford: Stuck or failed shift solenoid D, Low or contaminated transmission fluid, Clogged solenoid screen or valve body passage, Open, shorted, or corroded solenoid wiring/connector, Valve body wear or sticking spool valve. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0766 on a Ford?▼
Repair costs vary widely depending on the root cause and specific Ford model.
Which Ford models have P0766 documented?▼
Au7o has documented P0766 on 1 Ford model: Fiesta.