What Does P1792 Mean?
The transmission range display circuit has a short to battery voltage (B+), sending constant power where a signal wire should be. This prevents accurate gear position communication to the instrument cluster.
Common Causes
50%
Wiring harness damaged with wire contacting power source or adjacent power wire
25%
Corroded connector causing cross-circuit contamination between power and signal pins
15%
Failed transmission range sensor with internal short to power
10%
Instrument cluster internal circuit board failure
Diagnostic Steps
1
Step 1: Disconnect transmission range sensor connector and measure voltage on display circuit wire (should read 0V with sensor disconnected)
2
Step 2: Inspect wiring harness routing for contact with power wires, especially near heat sources or moving components
3
Step 3: Check for corrosion or melted connector housings that could cause pin-to-pin shorts
4
Step 4: Use a wiring diagram to identify adjacent circuits and probe for voltage bleed from nearby power sources
5
Step 5: Test instrument cluster by disconnecting it and rechecking circuit voltage to isolate cluster as fault source
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The transmission range display circuit has a short to battery voltage (B+), sending constant power where a signal wire should be. This prevents accurate gear position communication to the instrument cluster.
The most common cause of P1792 (Transmission Range Display Circ. Short to B+) is: Wiring harness damaged with wire contacting power source or adjacent power wire
Typical repair costs for P1792 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driver cannot reliably determine transmission gear position. May prevent vehicle starting if safety interlock system is compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1792 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control and Display
Difficulty
Type
Manufacturer
Recommended Tools
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