P2831: Shift fork A position circuit
Shift fork A position circuit fault
Severity: Inspect soon
A shift fork position fault in a dual-clutch or automated manual can cause delayed engagement or missed shifts, so get it checked soon.
It gets more serious if:
- Stop: Treat as Stop if the vehicle will not engage a gear or stalls.
P2831 in short
P2831 means the transmission computer saw the shift fork A position signal outside the maker's range. PartsAvatar lists outdated control software, the module, the transmission itself and wiring corrosion. Ford's 2012-2013 Focus bulletin lists it with delayed engagement and starting issues. Get it checked soon.
Shift fork position sensors tell a dual-clutch or automated manual gearbox which gear is selected. If voltage is out of range, P2831 sets.
PartsAvatar lists outdated TCM software, a faulty module, the transmission and corroded wiring. TroubleCodes.net gives only the definition.
Ford ASI-44686 lists P2831 among codes on 2012-2013 Focus with intermittent or delayed engagement, noise at start and no-start; the bulletin lists many codes together.
Most likely causes
Cause 1: Ford Focus bulletin
Supported by vehicle data- Why it ranks here
- Ford ASI-44686 lists P2831 and related codes on the 2012-2013 Focus with delayed engagement and start problems.
- What would change this
- Rises on a 2012-2013 Focus. Falls otherwise.
Cause 2: Outdated control software
Common general cause- Why it ranks here
- PartsAvatar lists outdated TCM software first.
- What would change this
- Rises if a newer calibration exists.
Cause 3: Wiring corrosion or connector
Common general cause- Why it ranks here
- PartsAvatar lists wiring corrosion.
- What would change this
- Rises if connectors look corroded.
Cause 4: Transmission assembly fault
Possible — needs testing- Why it ranks here
- PartsAvatar lists the transmission assembly after other causes.
- What would change this
- Rises if all else tests good.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Ask a dealer about bulletins and software updates for your VIN.
IfA bulletin applies
It meansFollow it.
IfA newer software exists
It meansUpdate it.
IfNeither
It meansHave the wiring tested.
Step 2: Have a shop check sensor voltage and connectors for corrosion.
Warning:Have a qualified shop do this step.
IfCorrosion or bad voltage
It meansRepair it.
IfGood
It meansTransmission assembly is next.
Symptoms
- Check engine light
- Intermittent or delayed engagement
- Shifting trouble or missed gears Gets more serious: stop and have it checked.
- Higher fuel use
How to fix
Step 1: Ask a dealer whether your VIN has a software update or bulletin for P2831.
Parts and cost context
- Transmission control module (TCM):Software is a listed cause. Labor varies; get a quote.
Labor varies by vehicle and shop; get a quote before you approve a repair.
Compare used part prices on PartPriceGuideOn your vehicle
FordYour car
2012–2013 · Focus
Supported by vehicle dataFord ASI-44686 lists P2831 among codes on 2012-2013 Focus with delayed engagement and start problems. Whether the bulletin is still current is not verified.
ASI-44686Status unverified
Intermittent or delayed engagement, no start, with or without DTCs including P2831
2012–2013focus · NHTSA 10056788
Ford bulletin for 2012-2013 Focus.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Related codes
P2831 questions
Can I drive with P2831?
Short trips to a shop are usually possible if it engages gears; stop if it will not engage or stalls.
Sources and review
- OBD II error code P2831: Shift Fork A Position Circuit
- P2831 Trouble Code: Shift Fork A Position Circuit
- Ford ASI 44686: P0805, P2831 and others, delayed engagement or no start
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error