OBD-II Code
P0845
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)
$500–$2,400
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P0845 covers transmission fluid pressure sensor B, the secondary pressure transducer used to monitor a specific circuit such as line, TCC apply, or clutch pack feed depending on the transmission family.
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 procedureP0845 covers transmission fluid pressure sensor B, the secondary pressure transducer used to monitor a specific circuit such as line, TCC apply, or c…
P0845 covers transmission fluid pressure sensor B, the secondary pressure transducer used to monitor a specific circuit such as line, TCC apply, or clutch pack feed depending on the transmission family.
The diagnostic ladder mirrors sensor A but with an added rationality step
- most TCMs cross-check A and B against each other, so a P0845 paired with no P0840 usually means B is wrong and A is right.
- Cheapest first, scan-tool both sensors side by side at idle in Park, then again during a 3-2 downshift; sensor B should track within 10-15 psi of sensor A on shared-circuit designs or hold its own commanded pressure on dedicated-circuit designs.
- Caveat: a substantial number of P0845 codes are actually internal valve-body wear, not a sensor fault; if the sensor reads a real but out-of-spec pressure, the EPC or pressure regulator valve is the underlying cause.
Vehicle-specific patterns2008-2013 GM 6T70/6T75 in Acadia, Traverse, Enclave, and Malibu sees P0845 from a worn pressure regulator valve in the valve body, not a true sensor…
- 2008-2013GM 6T70/6T75 in Acadia, Traverse, Enclave, and Malibu sees P0845 from a worn pressure regulator valve in the valve body, not a true sensor failure, and the Sonnax oversize PR valve kit is the durable repair.
- 2011-2017Chrysler Town & Country and Ram with the 62TE has a known TCC apply pressure sensor B failure that sets P0845 alongside torque converter shudder.
- 2013-2018BMW with ZF 8HP45 and 8HP70 throws P0845 from a mechatronic sleeve fluid leak that contaminates the sensor signal.
- 2015-2020Ford with the 6F35 in Escape, Edge, and Fusion sees a true sensor-only failure inside the main control body.
Estimated repair$500 to $2400.
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