OBD-II Code
P2704
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$400–$5,500
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P2704 is the apply-time monitor on Friction Element E, which only exists on transmissions with 5+ independently monitored elements — so 6-speeds with full element-by-element monitoring (Ford 6R80, GM 6L80/6L90, ZF 6HP variants), 8-speeds (ZF 8HP, Aisin AS69RC, Mercedes 7G-Tronic 722.9 in 8-speed evolutions), and 10-speeds (Ford 10R80, GM 10L80/10L90).
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 follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
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
- Check engine light
Read the full diagnostic procedureP2704 is the apply-time monitor on Friction Element E, which only exists on transmissions with 5+ independently monitored elements — so 6-speeds with…
P2704 is the apply-time monitor on Friction Element E, which only exists on transmissions with 5+ independently monitored elements — so 6-speeds with full element-by-element monitoring (Ford 6R80, GM 6L80/6L90, ZF 6HP variants), 8-speeds (ZF 8HP, Aisin AS69RC, Mercedes 7G-Tronic 722.9 in 8-speed evolutions), and 10-speeds (Ford 10R80, GM 10L80/10L90).
TCM logic is unchanged
350-500 ms target apply window, 700-1000 ms fault threshold. Cheapest-first ladder: fluid first (level, color, smell — burned fluid is the single biggest root-cause vector for P27xx codes); live-data capture of turbine vs output RPM during the failing shift; mechanical line-pressure check at idle (60-90 psi DRIVE) and WOT (180-260 psi commanded depending on application); then scope the PCS feeding Element E (8-30 ohm coil cold, 0.5-1.5 A drive). On 8-speeds and 10-speeds, the internal harness routing means a single chafed conductor at the case pass-through can mimic a failed solenoid — back-probe at the case connector before pulling the pan. Caveat: friction-element apply-time codes mean internal hydraulic delay — solenoid is cheapest, valve-body sealing rings + bore wear is medium, worn clutch packs is expensive. Pressure-test BEFORE teardown; pulling the pan + valve body costs $400+ in labor before parts.
Vehicle-specific patterns2017+ Ford 10R80 (F-150 EcoBoost, Mustang GT, Bronco) sees P2704 most often on early-build trans before Ford updated the calibration in 2019 — TSB-dr…
- 2017+Ford 10R80 (F-150 EcoBoost, Mustang GT, Bronco) sees P2704 most often on early-build trans before Ford updated the calibration in 2019 — TSB-driven recalibration cleared a meaningful share of these without hardware replacement.
- 2015+GM 8L90 (Camaro SS, Corvette C7, Cadillac CT6) throws P2704 from valve-body cross-leak between adjacent clutch-feed circuits; GM updated valve-body internals on later-production units.
- 2014+ZF 8HP70/8HP75 (BMW M-cars, Dodge Hellcat) throws P2704 alongside mechatronic faults when the mech sleeve weeps fluid into the connector; a $2,200-2,800 mechatronic rebuild is the typical outcome.
- 2010+Aisin AS69RC (Ram HD Cummins) and Mercedes 7G-Tronic 722.9 map Element E to manufacturer-specific clutches that don't translate one-to-one between brands — always pull the FSM cross-reference before condemning.
Estimated repair$400 to $5,500.
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