OBD-II Code
P0963
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–$2,500
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P0963 is the high-side counterpart to P0962 — the TCM sees the pressure control solenoid A control circuit pulled high, meaning the wire is shorted to power, the solenoid coil is open (no continuity), or the TCM driver has failed in a way that holds the circuit at battery voltage.
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 procedureP0963 is the high-side counterpart to P0962 — the TCM sees the pressure control solenoid A control circuit pulled high, meaning the wire is shorted t…
P0963 is the high-side counterpart to P0962 — the TCM sees the pressure control solenoid A control circuit pulled high, meaning the wire is shorted to power, the solenoid coil is open (no continuity), or the TCM driver has failed in a way that holds the circuit at battery voltage. The symptom split between low-circuit and high-circuit faults matters: P0962 (low) usually produces harsh shifts because line pressure is uncontrolled high, while P0963 (high) usually produces soft, slipping shifts because line pressure can't be commanded up — the TCM puts the transmission into limp mode with maximum line pressure as a self-protection measure, but the path to get there often involves slipping in between.
Cheapest-first ladder
- Pan-drop and ohm the EPC solenoid — an open coil reads infinity and is the cheap answer to P0963; expected resistance is 3-7 ohms on most domestic EPC solenoids.
- Backprobe the EPC control wire at the case connector and check for continuity to ground — an open circuit between the TCM and the solenoid (broken wire, corroded pin, melted internal lead frame) sets P0963 just like an open coil does.
- Verify the TCM is grounding the circuit on command with a scope or noid light — no command pulse means TCM driver failure.
- Live-data line pressure on the scan tool (on platforms that report it) and on a mechanical gauge through the test port — commanded vs. actual line pressure tells you whether the solenoid is responding at all. Expensive-misdiagnosis caveat: a melted internal lead frame on a Ford 6R80 produces P0963 along with several other solenoid codes simultaneously; treating each code as a separate solenoid failure means you'll buy four solenoids when one lead frame replacement is the real fix.
Vehicle-specific patternsGM 4L60E / 4L80E sets P0963 from EPC solenoid coil failure in the same 100k-150k mile window as P0962; the TCC slipping symptom is usually present lo…
GM 4L60E / 4L80E sets P0963 from EPC solenoid coil failure in the same 100k-150k mile window as P0962; the TCC slipping symptom is usually present long before the hard code sets. Ford 6R80 is the most common P0963 platform in late-model F-150 / Mustang / Expedition work — internal lead frame failure causes multiple solenoid codes including P0963, and the lead frame is the cheapest and correct fix. GM 6L80 sees P0963 from valve body bore wear at the EPC regulator and from harness chafe against the case. Aisin AS68RC throws P0963 from the same EPC failure pattern as P0962 — these transmissions are demanding on the EPC solenoid and the failure rate justifies a preventive replacement on any AS68RC over 120k miles that's already in the shop for related work.
Estimated repair$400 to $2,500.
Look up another code
More free tools