What Does P283B Mean?
The TCM has detected a fault in the shift fork C position sensor circuit. This indicates a complete circuit failure preventing the TCM from reading the position of shift fork C in the transmission.
Common Causes
35%
Failed shift fork C position sensor
30%
Open or shorted wiring in shift fork C position sensor circuit
20%
Damaged or corroded connector at shift fork C position sensor
10%
TCM internal failure or programming issue
5%
Mechanical damage to shift fork C or sensor mounting
Diagnostic Steps
1
Step 1: Visually inspect shift fork C position sensor connector for damage, corrosion, bent pins, or water intrusion
2
Step 2: Check power supply and ground circuits to shift fork C position sensor using multimeter
3
Step 3: Test shift fork C position sensor resistance and signal output; compare to manufacturer specifications
4
Step 4: Inspect wiring harness for shorts to power, shorts to ground, or open circuits using continuity testing
5
Step 5: If circuits test normal, replace shift fork C position sensor and clear codes
Estimated Repair Cost
$400 - $1,500
Parts + labor, varies by vehicle and location
The TCM has detected a fault in the shift fork C position sensor circuit. This indicates a complete circuit failure preventing the TCM from reading the position of shift fork C in the transmission.
The most common cause of P283B (Shift Fork "C" Position Circuit) is: Failed shift fork C position sensor
Typical repair costs for P283B range from $400 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission may not shift correctly or may enter limp mode with limited gear selection. Vehicle should be driven cautiously and repaired promptly to prevent further transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P283B to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
