What Does P2842 Mean?
The Shift Fork D position sensor circuit voltage is reading below the minimum threshold expected by the TCM. This low voltage condition prevents accurate gear position monitoring.
Common Causes
40%
Short to ground in sensor signal wire or connector
30%
Failed shift fork position sensor with internal short
20%
Poor or corroded sensor ground connection
10%
TCM internal circuit failure pulling voltage low
Diagnostic Steps
1
Step 1: Disconnect shift fork D position sensor and measure voltage at TCM side of harness connector
2
Step 2: Check for short to ground in signal wire using ohmmeter with sensor disconnected
3
Step 3: Inspect sensor connector terminals for corrosion, moisture, or pushed-back pins
4
Step 4: Test sensor resistance and voltage output per manufacturer specifications
5
Step 5: Verify 5-volt reference supply from TCM is present at sensor connector
Estimated Repair Cost
$350 - $1,600
Parts + labor, varies by vehicle and location
The Shift Fork D position sensor circuit voltage is reading below the minimum threshold expected by the TCM. This low voltage condition prevents accurate gear position monitoring.
The most common cause of P2842 (Shift Fork "D" Position Circuit Low) is: Short to ground in sensor signal wire or connector
Typical repair costs for P2842 range from $350 to $1,600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission may not shift properly or may default to limp mode with limited gear availability. Avoid aggressive driving until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2842 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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