What Does P283D Mean?
The shift fork C position sensor circuit voltage is below the minimum threshold expected by the TCM. This indicates a short to ground, low voltage supply, or sensor internal failure causing low signal output.
Common Causes
35%
Short to ground in shift fork C position sensor signal wire
30%
Failed shift fork C position sensor with internal short
20%
Low voltage supply to sensor due to power circuit fault
10%
Damaged connector causing short between pins
5%
TCM internal fault with sensor power supply circuit
Diagnostic Steps
1
Step 1: Disconnect shift fork C position sensor and measure voltage on signal wire with key on; should be near 0V disconnected
2
Step 2: Check for short to ground in signal wire by measuring resistance to ground with sensor disconnected
3
Step 3: Verify sensor power supply voltage at connector (typically 5V or 12V); compare to specifications
4
Step 4: Test shift fork C position sensor on bench or with sensor disconnected for internal short condition
5
Step 5: Repair shorted wiring or replace sensor as indicated by testing results
Estimated Repair Cost
$350 - $1,400
Parts + labor, varies by vehicle and location
The shift fork C position sensor circuit voltage is below the minimum threshold expected by the TCM. This indicates a short to ground, low voltage supply, or sensor internal failure causing low signal output.
The most common cause of P283D (Shift Fork "C" Position Circuit Low) is: Short to ground in shift fork C position sensor signal wire
Typical repair costs for P283D range from $350 to $1,400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission will likely enter limp mode with reduced functionality. Vehicle may be stuck in one gear or have limited gear selection, affecting acceleration and highway driving capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P283D 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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