OBD-II Code · Powertrain
P0871
Overdrive Pressure Switch Circuit Range/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.
Overdrive pressure switch reading out of expected range.
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
- Harsh OD shifts
- Limp mode
- Slipping in OD
Likely causes
- Failed pressure switchMost common
- Low fluid
- Internal wear
Read the full diagnostic procedureP0871 sets when the overdrive (5th gear) hydraulic pressure switch returns an open or shorted state inconsistent with the commanded gear, most common…
P0871 sets when the overdrive (5th gear) hydraulic pressure switch returns an open or shorted state inconsistent with the commanded gear, most commonly on 5-speed and 6-speed automatics that use discrete pressure switches inside the valve body rather than full analog sensors.
Cheapest first
- verify transmission fluid level and condition at operating temperature, because low fluid or aerated ATF prevents the OD circuit from reaching pressure switch close-threshold (typically 30-60 psi) even when the solenoid is commanded on.
- Scan-tool the OD pressure switch PID and command a 4-5 upshift on a road test; the switch should toggle from open to closed within 0.3 seconds of the OD apply solenoid command.
- Caveat: the OD pressure switch is almost always integrated into the solenoid pack or valve body, so replacement is rarely sensor-only.
Vehicle-specific patterns2002-2010 Dodge Ram and Durango with the 545RFE shows P0871 most often from a stuck OD accumulator piston, not the switch, and the Sonnax accumulator…
- 2002-2010Dodge Ram and Durango with the 545RFE shows P0871 most often from a stuck OD accumulator piston, not the switch, and the Sonnax accumulator repair kit is the durable fix.
- 2004-2010Ford Explorer and F-150 with the 5R55W/5R55S sees P0871 from solenoid pack internal pressure switch failure at 80-120k miles.
- 2005-2013Nissan Frontier and Xterra with the RE5R05A throws P0871 when valve body wear lets OD pressure bleed off below switch threshold.
- 2007-2012GM with the 6L80 in early Silverado and Yukon applications sees the OD switch fail on the TEHCM.
Estimated repair$380 to $1900.
Look up another code
P0871 — frequently asked
What does a P0871 code mean?
Overdrive pressure switch reading out of expected range.
What causes a P0871 code?
Common causes: Failed pressure switch; Low fluid; Internal wear.
What are the symptoms of a P0871 code?
Typical symptoms: Harsh OD shifts; Limp mode; Slipping in OD.
Is it safe to drive with a P0871 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 P0871 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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