P0758: How to Diagnose & Fix — Shift Solenoid "B" Electrical
13 vehicles · 8 makes · $150-$5,000 repair
How to diagnose and fix P0758: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Honda Passport · 2000–2002
The first-generation Passport's 4-speed automatic is widely documented for torque-converter clutch shudder, slipping, harsh shifts, and eventual hard-part failure, especially loss of 2nd gear. Honda issued service information tied to Isuzu-sourced driveline components, and owner complaints frequently describe the vehicle revving without acceleration or dropping into limp behavior after warm-up. Once clutch material contaminates the fluid, the problem often progresses quickly from intermittent shudder to a full rebuild or replacement.
Common Symptoms
- Shudder or vibration during light throttle
- Delayed engagement into Drive or Reverse
- Slipping on acceleration
- Loss of 2nd gear
- Harsh upshifts or downshifts
- Burnt or dark transmission fluid
How to Fix
Diagnosis usually starts with checking fluid condition, verifying shift timing, and scanning for transmission-related DTCs. Mild shudder may improve briefly with a complete fluid exchange and updated friction-modifier-compatible ATF, but units that have already lost 2nd gear or are slipping under load typically need a rebuild or replacement torque converter. Owners and transmission shops also inspect the cooler and lines for debris so the replacement unit is not contaminated.
Owner tips & cautions
- TipIf the transmission is still moving the vehicle, inspect fluid color and smell immediately; continuing to drive with slipping or shuddering often turns a converter problem into a full rebuild.
- TipAfter any rebuild or replacement, flush or replace the transmission cooler and lines to prevent old clutch debris from contaminating the new unit.
Sources for this issue (2)
Mercury Cougar · 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.
Common Symptoms
- no-forward or lost-gear condition identified
- transmission codes and freeze-frame preserved
- pressure, solenoid, sensor and hard-part paths separated
How to Fix
Preserve all transmission codes and freeze-frame data, identify which gears are lost, test line pressure and solenoid circuits, verify fluid level and condition, and inspect the transmission tag and prior repairs. Follow the symptom- and build-specific Ford procedure before choosing a sensor, solenoid, valve-body repair, hard parts or a remanufactured unit. Do not buy a transmission or rebuild kit from this page; the failed CD4E path must be established first.
Sources for this issue (1)
Lexus RX · 2000–2003
Early first-generation RX300 models are well known for premature automatic transmission failure, especially on AWD vehicles but also on FWD examples. Owners report delayed engagement into Drive or Reverse, harsh shifting, slipping on acceleration, and eventual loss of movement; teardown reports commonly cite burned clutches and damaged planetary gear components. The issue is widely documented in owner communities, repair databases, and NHTSA complaints, and is often attributed to a transmission that runs hot and is heavily stressed by vehicle weight.
Common Symptoms
- Delayed engagement into Drive or Reverse
- Harsh 1-2 or 2-3 shifts
- Transmission slipping under load
- Engine revs increase with little vehicle movement
- Burnt transmission fluid smell
- Vehicle eventually will not move
How to Fix
Diagnosis usually starts with checking fluid condition, line pressure behavior, and whether engagement delay or flare shifts are present when warm. In most cases, fluid changes do not cure an already failing unit; the durable fix is a quality rebuild or replacement transmission, often with updated hard parts and careful inspection of the cooler and valve body. Many owners also add an auxiliary transmission cooler after replacement to reduce repeat failures.
Owner tips & cautions
- TipIf replacing the transmission, owners commonly recommend installing an external transmission cooler and fully flushing cooler lines to avoid contaminating the rebuilt unit.
- TipUse Toyota Type T-IV compatible fluid and avoid generic fluid mixes on these early Aisin units.
Sources for this issue (1)
Volkswagen Jetta · 1999–2005
Chevrolet Silverado 1500 · 2007–2019
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P0758 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0758 mean?
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.
What are the most common causes of P0758?
The most common causes of P0758 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P0758?
Repair costs for P0758 range from $150 to $5,000, depending on the vehicle and root cause.
Which vehicles are affected by P0758?
Au7o has documented P0758 across 13 vehicle models from 8 manufacturers: Chevrolet, Chrysler, Honda, Lexus, Mercury, Pontiac, Toyota, Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.