What Does P1302 Mean?
The PCM has detected that multiple fuel injector high-side power circuits are shorted together. This means the power supply wires for different injectors are touching, causing multiple injectors to fire simultaneously or incorrectly.
Safety Warning
Engine will run extremely poorly with multiple cylinders misfiring or flooding. Risk of engine damage from overfueling. Do not drive until repaired.
Common Causes
45%
Damaged wiring harness with exposed wires touching
25%
Melted connector pins shorted together from overheating
15%
Incorrectly repaired wiring with crossed connections
10%
Damaged PCM internal circuits with cross-connected drivers
5%
Liquid contamination in injector connector causing bridging
Diagnostic Steps
1
Step 1: Disconnect all fuel injector connectors and inspect for melted, damaged, or bent pins
2
Step 2: Measure resistance between high-side circuits of different injectors with all injectors disconnected (should be infinite/open)
3
Step 3: Carefully inspect entire injector harness for chafed areas where wires may be exposed and touching
4
Step 4: Check for liquid contamination in valve cover area that may have entered connectors
5
Step 5: Test PCM injector driver circuits individually to verify no internal shorts
Estimated Repair Cost
$200 - $1,600
Parts + labor, varies by vehicle and location
The PCM has detected that multiple fuel injector high-side power circuits are shorted together. This means the power supply wires for different injectors are touching, causing multiple injectors to fire simultaneously or incorrectly.
The most common cause of P1302 (Injector High Sides Shorted Together) is: Damaged wiring harness with exposed wires touching
Typical repair costs for P1302 range from $200 to $1,600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine will run extremely poorly with multiple cylinders misfiring or flooding. Risk of engine damage from overfueling. Do not drive until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1302 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Manufacturer
Recommended Tools
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