What Does U1184 Mean?
The control module is not receiving valid wiper/washer data over the SCP network. This prevents proper coordination between the wiper control module and other vehicle systems that need wiper status information.
Common Causes
40%
Failed windshield wiper control module or multifunction switch not transmitting data
30%
Open or shorted circuit in SCP network wiring between wiper module and other controllers
20%
Body Control Module or GEM not receiving wiper status messages properly
10%
Corroded connections or water damage at wiper motor or control module
Diagnostic Steps
1
Step 1: Test wiper system operation manually and verify which functions work or fail
2
Step 2: Check which module is setting the code to determine if it's a transmitter or receiver issue
3
Step 3: Inspect wiper control module and multifunction switch connectors for corrosion or damage
4
Step 4: Monitor live data for wiper status signals while operating wiper switch
5
Step 5: Test continuity and resistance on SCP bus circuits between wiper module and BCM/GEM
Estimated Repair Cost
$120 - $600
Parts + labor, varies by vehicle and location
The control module is not receiving valid wiper/washer data over the SCP network. This prevents proper coordination between the wiper control module and other vehicle systems that need wiper status information.
The most common cause of U1184 (SCP (J1850) Invalid or Missing Data for Window Wiper / Washer) is: Failed windshield wiper control module or multifunction switch not transmitting data
Typical repair costs for U1184 range from $120 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Wipers may still operate manually but automatic or rain-sensing features may not work. Reduced visibility during precipitation could affect safety if wipers fail completely.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1184 to identify the root cause.
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Quick Info
Category
Network
System
Windshield Wiper/Washer System / Body Control Network
Difficulty
Type
Manufacturer
Recommended Tools
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