OBD-II Code · Transmission
P0780
Shift Malfunction
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)
$200–$2,500
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
General shift fault — can be any solenoid.
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
- Won't shift
- Harsh shifts
- Limp mode
Likely causes
- Solenoid failureMost common
- Low fluid
- Valve body
Read the full diagnostic procedureP0780 is a TCM-detected general shift malfunction — the TCM commanded a gear change, watched the input/output shaft speed ratio NOT change to the new…
P0780 is a TCM-detected general shift malfunction — the TCM commanded a gear change, watched the input/output shaft speed ratio NOT change to the new gear's expected ratio within the allowed time window (typically 0.5-1.5 seconds), and threw the code. It's the umbrella code that fires alongside or instead of the gear-specific P0781-P0785 family.
Cheapest-first ladder
- Pull all trans codes and look at the company P0780 keeps — a lone P0780 with no shift-specific codes usually points at TCM software, ground, or input data; P0780 paired with P0741 (TCC stuck off), P0700, or any solenoid electrical code is pointing at the solenoid pack.
- Check fluid level and condition first — low fluid is the #1 cause of slipped shifts that throw P0780 on every transmission ever built, and burned/dark/varnished fluid means internal damage that no solenoid swap will fix.
- Scan-tool live data and command a 1-2, 2-3, 3-4 shift while watching commanded gear vs. actual gear ratio (input RPM / output RPM should land at a known value for each gear: roughly 2.4:1 in first on a 4L60E, 1.4:1 in second, 1.0:1 in third, 0.7:1 in fourth); the gear that doesn't land at the right ratio is the gear that's failing, which converts P0780 into a specific P078X you can chase.
- Inspect the trans pan magnet for metal — bronze flakes mean bushing wear, steel flakes mean planet/sun/clutch debris, and either rules out a cheap fix. The expensive-misdiagnosis caveat: P0780 with clean fluid and normal cruise behavior is often just a sticking shift solenoid ($90-250 parts, half-day labor); P0780 with burned fluid, slipping under load, or a delay-into-gear is internal damage and the rebuild ticket starts at $2,500.
Vehicle-specific patterns1995-2014 GM 4L60E (Silverado, Tahoe, Trailblazer) throws P0780 most commonly from the sun-shell crack/split — the reaction sun shell breaks at the s…
- 1995-2014GM 4L60E (Silverado, Tahoe, Trailblazer) throws P0780 most commonly from the sun-shell crack/split — the reaction sun shell breaks at the splines and causes intermittent reverse loss along with random forward-shift faults; a hardened replacement sun shell is $80-150 part, but it's a pan-down or unit-out repair depending on access.
- 1996-2008Ford 5R55E / 5R55W / 5R55S (Explorer, Mountaineer, Mustang) is famously a P0780 generator — the intermediate and overdrive bands wear out around 100-150k miles and shifts go long, soft, or missing entirely; rebuild on these is $2,200-3,800 because of the band-and-servo complexity.
- 2003-2012Chrysler 545RFE / 65RFE (RAM, Durango, Grand Cherokee) throws P0780 from the TCM solenoid pack ($200-400 part) and from worn input/intermediate clutches around 130k miles. 2013-present Aisin AS69RC (RAM 2500/3500 HD diesel) throws P0780 from internal valve-body wear and is a $4,500-7,000 rebuild given the part costs.
Estimated repair$250 (solenoid pack) to $7,000 (AS69RC rebuild).
Look up another code
P0780 — frequently asked
What does a P0780 code mean?
General shift fault — can be any solenoid.
What causes a P0780 code?
Common causes: Solenoid failure; Low fluid; Valve body.
What are the symptoms of a P0780 code?
Typical symptoms: Won't shift; Harsh shifts; Limp mode.
Is it safe to drive with a P0780 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $200-$2,500.
How do I diagnose a P0780 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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