OBD-II trouble code
P0762: Shift Solenoid "C" Stuck On
This is one of very few internal transmission faults you can prove in your hand on a bench. It is also the one where a new solenoid most often sticks in exactly the same place, because the aluminium bore it lives in has worn.
Quick facts
- System
- Powertrain
- Category
- Transmission / Shift Control
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $150 – $900
- DIY difficulty
- Advanced DIY
What does P0762 mean?
P0762 records that shift solenoid C's element remained applied after the controller stopped asking for it. What makes this code unusual among transmission faults is not the failure itself but how conclusively it can be confirmed, and how often the part everyone blames turns out to be the wrong thing to replace.
Start with the confirmation, because almost nothing else inside an automatic transmission offers it. Most internal faults are inferred: you reason from ratios, pressures and symptoms toward a conclusion, and you find out whether you were right after the unit is reassembled. A shift solenoid is different. Once it is out, it can be tested on a bench with a regulated supply and a source of low-pressure air. Apply rated voltage and the valve should shift audibly and pass or block air as designed. Remove the voltage and it should return every time. A solenoid that will not return with no current in the coil is proved faulty in your hand, not argued about. Repeating the test warm, after the coil has been energised for a minute or two, is worth doing as well, since a marginal one will often behave when cold and hang when hot. This is a definitive answer obtained before any decision about a rebuild has to be made, which is a rare luxury in this part of the vehicle.
Now the part that explains the repeat failures. A shift solenoid's valve slides inside a bore machined into the valve body, and valve bodies are aluminium — soft, and easy for circulating debris to score. When a bore has worn oval or picked up a raised burr, the clearance the valve needs is gone, and it will hang open regardless of the condition of the solenoid fitted into it. So the common and frustrating sequence with this code is a new solenoid, a few hundred miles of correct operation while the fresh parts bed in, and then the identical code again. If that has happened, the solenoid was almost certainly never the fault. The repair in that case is the bore: a valve body that has been reamed and sleeved by a specialist, or a replacement valve body. Fitting a third solenoid will produce the same result as the second.
The third thing worth understanding before agreeing to a quote is how these parts are sold, because it changes the arithmetic in a way that is not obvious. On most modern transmissions shift solenoids are not individually available. They come as a pack, or bolted to a valve body assembly that is only supplied complete. Even where a single solenoid can be bought, the labour to reach it — fluid out, pan off, filter off, valve body dropped or partially dismantled — is identical whether you change one solenoid or every solenoid in the unit. On a high-mileage transmission where all the solenoids have seen the same fluid, the same heat and the same number of cycles, replacing the set while you are in there is usually the rational choice rather than an upsell. The one that failed is the one that failed first, not the only one that is tired.
One useful cross-check while the unit is still assembled: compare this solenoid's behaviour against its siblings on live data through a full range of shifts. They are similar components doing similar work on the same fluid, which gives you a built-in reference. A single outlier supports a local fault. Several behaving oddly points at the fluid and the valve body as a whole, and that distinction should be settled before the parts list is written.
Common causes
- Worn or scored valve bore in the aluminium valve body preventing the valve from seating
- Debris embedded in the bore wall holding the valve off its seat
- Solenoid that has failed mechanically and will not return when de-energised
- Solenoid that returns when cold but hangs once the coil is hot
- Raised burr in the bore from previous debris circulation
- Distorted valve body or failed separator plate gasket feeding the element continuously
- Contaminated fluid gumming the valve in position
- Incorrect or non-matching replacement solenoid fitted previously
Symptoms
- Transmission locked into limp mode holding one gear
- Missing or corrupted engagement of the gears whose pattern requires solenoid C off
- Harsh or slamming engagement into the affected gears
- The same code returning after a solenoid has already been replaced
- Fault appearing only once the transmission is fully warm
- Engine speed inconsistent with road speed in specific gears
- Check engine light with the engine running normally
- Several solenoids behaving inconsistently on live data rather than just one
Diagnostic steps
- 1.Compare solenoid C's reported behaviour against the other solenoids in the unit on live data through a full range of shifts before removing anything. They are similar components on the same fluid doing similar work, so you have a reference built into the vehicle. One outlier supports a local fault. Several behaving oddly points at the fluid and the valve body as a whole, and that should be settled before a parts list is written.
- 2.Bench test the solenoid once it is out, which is the confirmation almost no other internal transmission fault offers. Apply rated voltage with a regulated supply and low-pressure air, and watch it shift and pass or block as designed. Remove the voltage and it must return every time. A solenoid that will not return with no current in the coil is proved faulty rather than suspected.
- 3.Repeat the bench test warm, after the coil has been energised for a minute or two. A marginal solenoid frequently returns perfectly when cold and hangs once hot, which matches the common complaint that the fault only appears after the vehicle has been running for a while. A cold-only test will pass a part that is genuinely failing.
- 4.Inspect the valve bore itself with the solenoid out, and treat this as the main event rather than an afterthought. Valve bodies are aluminium and circulating debris scores them. A bore that has worn oval or picked up a burr will hang a brand-new solenoid exactly as it hung the old one, and this is the single most common reason this specific code returns after a replacement.
- 5.If the code has already returned once after a solenoid was fitted, stop suspecting solenoids. The evidence points at the bore, and the repair is a valve body that has been reamed and sleeved by a specialist or a replacement valve body. A third solenoid will behave like the second.
- 6.Establish how the part is actually supplied for your transmission before authorising work. Many units only sell shift solenoids as a pack or as part of a complete valve body, and the labour to reach one is identical to the labour to reach all of them — so on a high-mileage unit, replacing the set is usually the rational decision rather than an upsell.
Repair cost
$150 – $900
What this costs depends mostly on whether the bore is serviceable. A solenoid replacement where the pan gives access and the bore is sound is $300 to $600 including a fluid and filter service. Where solenoids are only supplied as a pack, the part alone can be $200 to $500, though the labour is the same as changing one — which is why fitting the set is often the better value on a high-mileage unit. A worn bore is the expensive branch: a specialist reamed and sleeved valve body or a replacement body pushes the total to $900 and above, and this is the outcome to expect if a solenoid has already been tried once. Ask specifically whether the bore was inspected, because a bench test proves the solenoid and says nothing about the hole it came out of.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with transmission shift solenoid replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.