OBD-II Code · Powertrain
P0751
Shift Solenoid "A" Performance
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$300–$2,500
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Shift A solenoid commanded but gear not engaging correctly.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Shifts at wrong RPM
- Stuck gear
- Check engine light
Likely causes
- Worn solenoidMost common
- Worn clutch pack
- Low / contaminated trans fluid
Read the full diagnostic procedureP0751 is the performance flag for Shift Solenoid A — the solenoid passes its electrical check but the TCM has determined that the resulting shift did…
P0751 is the performance flag for Shift Solenoid A — the solenoid passes its electrical check but the TCM has determined that the resulting shift didn't happen correctly. Specifically, when the TCM commanded the solenoid to apply (or release) for a particular shift, the actual gear ratio calculated from input/output RPM didn't match the commanded ratio within the allowable window (typically ±7-10% of expected). The cause could be a mechanically stuck solenoid (valve seized in bore from varnish), a stuck shift valve in the valve body (most common — solenoid is fine, the valve it controls isn't moving), a worn clutch pack that won't apply even with correct hydraulic command, or a separator-plate gasket failure cross-feeding fluid between circuits.
Fluid first, and pay extra attention to fluid color
- P0751 with dark fluid means clutch material is already in the system and you're past a simple solenoid fix.
- A wet-air pressure test of the valve body off-vehicle isolates a sticking valve from a sticking solenoid in about 20 minutes and is the ATRA-recommended next step.
Vehicle-specific patterns2003-2008 Honda Accord/Pilot 5AT throws P0751 from a known 2nd-gear clutch pack failure — Honda extended warranty coverage on affected VINs, otherwis…
- 2003-2008Honda Accord/Pilot 5AT throws P0751 from a known 2nd-gear clutch pack failure — Honda extended warranty coverage on affected VINs, otherwise it's a rebuild ($2,800-4,000).
- 2005-2010GM 4L60E (Silverado, Tahoe, Trailblazer) throws P0751 most often from a stuck 1-2 shift valve in the valve body — Sonnax shift valve kit $40, plus a separator plate at $60, fixes it without a rebuild on roughly 60% of these per ATRA shop bulletins.
- 2004-2009Volvo XC70/XC90 and Saab 9-3 with the Aisin AW55-50SN throws P0751 from valve-body wear that's now famous in the trans-rebuild community — the AW55-50SN valve body wears its bores oversize and Sonnax oversized-valve kits are essentially mandatory at any rebuild past 130k miles.
- 2008-2013Nissan Altima with the JF016E CVT doesn't use traditional shift solenoids but throws step-motor codes that scan as P0751-equivalent — CVT replacement only.
Estimated repair$200 (valve-body repair) to $4,500+ (rebuild).
Look up another code
P0751 — frequently asked
What does a P0751 code mean?
Shift A solenoid commanded but gear not engaging correctly.
What causes a P0751 code?
Common causes: Worn solenoid; Worn clutch pack; Low / contaminated trans fluid.
What are the symptoms of a P0751 code?
Typical symptoms: Shifts at wrong RPM; Stuck gear; Check engine light.
Is it safe to drive with a P0751 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $300-$2,500.
How do I diagnose a P0751 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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