What Does P2773 Mean?
The PCM has detected abnormally low voltage in the 4WD low range switch circuit. This suggests a short to ground, open circuit, or switch failure causing insufficient signal voltage.
Common Causes
35%
Short to ground in wiring harness or damaged wire insulation
30%
Failed 4WD selector switch with internal short circuit
20%
Corroded or damaged connector causing poor contact or ground fault
10%
Open circuit in switch power supply or signal wire
5%
Failed transfer case control module with shorted input circuit
Diagnostic Steps
1
Step 1: Measure voltage at 4WD switch connector with key on (should show reference voltage, typically 5V or 12V)
2
Step 2: Disconnect switch and check for short to ground in harness wiring using ohmmeter
3
Step 3: Test switch resistance across terminals in various positions per service manual specifications
4
Step 4: Inspect wiring harness for chafing, pinching, or damage especially near transfer case mounting points
5
Step 5: Check connector pins for corrosion, bent terminals, or water intrusion causing ground fault
Estimated Repair Cost
$100 - $550
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage in the 4WD low range switch circuit. This suggests a short to ground, open circuit, or switch failure causing insufficient signal voltage.
The most common cause of P2773 (Four Wheel Drive (4WD) Low Switch Circuit Low) is: Short to ground in wiring harness or damaged wire insulation
Typical repair costs for P2773 range from $100 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
4WD low range will not engage properly, limiting off-road capability. Vehicle remains safe for normal 2WD driving but should not be operated in conditions requiring 4WD.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2773 to identify the root cause.
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Quick Info
Category
Powertrain
System
Four Wheel Drive System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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