P0758 on Mercury
Shift Solenoid "B" Electrical
P0758 on Mercury vehicles indicates shift solenoid "b" electrical. Au7o has documented this code across 1 Mercury model — most commonly on Cougar. This powertrain code indicates an electrical fault in the transmission's shift solenoid 'B' circuit. Shift solenoids are electrically controlled valves that route transmission fluid to engage the correct gears (solenoid B is commonly associated with the 2-3 shift). The transmission computer detected the solenoid circuit electrical value (voltage/current) outside the expected range. This can cause harsh or missed shifts, slipping, or the transmission entering limp mode, and should be addressed to avoid further transmission damage.
Common Causes of P0758
- •Faulty shift solenoid B
- •Damaged, shorted, or open solenoid wiring/connector
- •Low or contaminated transmission fluid
- •Clogged or worn valve body passages
- •Internal transmission electrical (harness) fault
- •Faulty transmission control module (less common)
P0758 on Mercury by Model
Mercury Cougar(1 issue)
- CD4E Automatic Transmission Failure (8th Gen)1999-2002
NHTSA communications establish several distinct CD4E conditions on 1999-2002 Cougar vehicles: no-forward engagement in 605229 and 6091763, 1999 ring-gear side loading of the forward-clutch snap-ring retainer in 607645, intermittent loss of first and second gears with P0758 or P0740 in 619324, and harsh or delayed shifts after speed-sensor service in 630631. These records support the generic CD4E problem identity but not one universal valve-body or drum cause.
Looking for P0758 on a different make?
View P0758 across all makes →Frequently Asked Questions
What does P0758 mean on Mercury?▼
P0758 stands for "Shift Solenoid "B" Electrical." This powertrain code indicates an electrical fault in the transmission's shift solenoid 'B' circuit. Shift solenoids are electrically controlled valves that route transmission fluid to engage the correct gears (solenoid B is commonly associated with the 2-3 shift). The transmission computer detected the solenoid circuit electrical value (voltage/current) outside the expected range. This can cause harsh or missed shifts, slipping, or the transmission entering limp mode, and should be addressed to avoid further transmission damage. On Mercury specifically, this code is documented across 1 model.
What causes P0758 on Mercury vehicles?▼
Common causes on Mercury: Faulty shift solenoid B, Damaged, shorted, or open solenoid wiring/connector, Low or contaminated transmission fluid, Clogged or worn valve body passages, Internal transmission electrical (harness) fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0758 on a Mercury?▼
Repair costs vary widely depending on the root cause and specific Mercury model.
Which Mercury models have P0758 documented?▼
Au7o has documented P0758 on 1 Mercury model: Cougar.