What Does P1915 Mean?
The reverse gear position switch circuit has detected a malfunction, either failing to signal when in reverse or signaling incorrectly in other gear positions. This affects backup light operation and TCM shift logic.
Common Causes
30%
Failed reverse gear position switch or sensor
25%
Damaged or corroded switch connector or wiring harness
20%
Misadjusted manual shift linkage preventing proper switch actuation
15%
Internal transmission shift mechanism wear affecting switch engagement
10%
Short to ground or power in reverse switch circuit wiring
Diagnostic Steps
1
Step 1: Verify backup lights operate correctly; shift through all gear positions while monitoring switch state with scan tool
2
Step 2: Inspect reverse switch connector for corrosion, damage, or loose terminals
3
Step 3: Test reverse switch continuity in reverse position and open circuit in other positions
4
Step 4: Check shift linkage adjustment and ensure manual valve is fully engaging reverse position
5
Step 5: Test wiring harness continuity between switch and TCM; check for shorts to ground or power
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The reverse gear position switch circuit has detected a malfunction, either failing to signal when in reverse or signaling incorrectly in other gear positions. This affects backup light operation and TCM shift logic.
The most common cause of P1915 (Reverse Switch Circuit Malfunction) is: Failed reverse gear position switch or sensor
Typical repair costs for P1915 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Backup lights may not function, reducing visibility to other drivers when reversing. TCM may also apply incorrect shift logic or prevent engine starting if neutral safety function is integrated.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1915 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
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