What Does U1131 Mean?
Second fuel system communication code indicating continued or additional failure to receive valid fuel system data over the network. May represent different data parameter or redundant monitoring by another module.
Common Causes
35%
PCM internal failure affecting fuel data calculation or transmission
30%
Network communication problem between PCM and multiple receiving modules
15%
Failed fuel sending unit preventing PCM from calculating valid data
12%
Body control module or instrument cluster receiving circuit failure
8%
Multiple module power supply issue affecting fuel system data distribution
Diagnostic Steps
1
Step 1: Verify fuel level sender operation by monitoring resistance values at PCM connector (typically 16-178 ohms)
2
Step 2: Check if fuel gauge is functional and displaying information to narrow down if issue is input or output
3
Step 3: Monitor PCM data stream for fuel level percentage and compare to actual tank level
4
Step 4: Test communication between PCM and body control module using bidirectional scan tool controls
5
Step 5: Inspect all fuel system related connectors including in-tank fuel pump module connector for corrosion
Estimated Repair Cost
$150 - $1,600
Parts + labor, varies by vehicle and location
Second fuel system communication code indicating continued or additional failure to receive valid fuel system data over the network. May represent different data parameter or redundant monitoring by another module.
The most common cause of U1131 (SCP (J1850) Invalid or Missing Data for Fuel System) is: PCM internal failure affecting fuel data calculation or transmission
Typical repair costs for U1131 range from $150 to $1,600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Inaccurate or non-functioning fuel gauge may lead to unexpected fuel exhaustion. Driver should manually track fuel consumption and refuel conservatively.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1131 to identify the root cause.
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Quick Info
Category
Network
System
Fuel System Communication
Difficulty
Type
Manufacturer
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