What Does P1918 Mean?
The transmission range display circuit has a fault preventing proper communication between the gear selector and instrument cluster. This affects the driver's ability to see which gear is selected.
Common Causes
35%
Faulty transmission range sensor (PRNDL sensor) or misadjustment
30%
Wiring harness damage or connector issues between range sensor and TCM/instrument cluster
20%
Failed instrument cluster display circuit or communication fault
15%
TCM internal fault or communication bus error
Diagnostic Steps
1
Step 1: Check if gear position indicator displays correctly on instrument cluster while cycling through gears
2
Step 2: Verify transmission range sensor adjustment and proper linkage connection
3
Step 3: Scan for communication codes and verify CAN bus communication between TCM and cluster
4
Step 4: Test transmission range sensor signal at TCM connector using voltmeter in each gear position
5
Step 5: Inspect wiring between transmission, TCM, and instrument cluster for damage or shorts
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The transmission range display circuit has a fault preventing proper communication between the gear selector and instrument cluster. This affects the driver's ability to see which gear is selected.
The most common cause of P1918 (Transmission Range Display Circuit Malfunction) is: Faulty transmission range sensor (PRNDL sensor) or misadjustment
Typical repair costs for P1918 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driver may not be able to accurately determine which gear is selected, creating potential for unexpected vehicle movement. Vehicle may not start or may not shift properly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1918 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System / Instrument Cluster
Difficulty
Type
Manufacturer
Recommended Tools
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