What Does U1115 Mean?
A secondary code indicating continued failure to receive charging system data over the network. Often stored alongside U1114 when multiple modules cannot access charging information.
Common Causes
30%
PCM not broadcasting charging system data due to internal fault
25%
Network bus communication failure blocking data transmission
25%
Alternator communication circuit open or shorted
15%
Failed instrument cluster unable to receive network messages
5%
Corroded PCM connector affecting network or charging circuit
Diagnostic Steps
1
Step 1: Compare live charging system data between multiple modules using scan tool bidirectional controls
2
Step 2: Check for proper network communication between PCM and instrument cluster
3
Step 3: Test alternator L-terminal (lamp) circuit for proper voltage and resistance
4
Step 4: Verify PCM has good power, ground, and network connections at all connector pins
5
Step 5: Clear codes and test drive to see if U1115 returns without U1114, indicating secondary module issue
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
A secondary code indicating continued failure to receive charging system data over the network. Often stored alongside U1114 when multiple modules cannot access charging information.
The most common cause of U1115 (SCP (J1850) Invalid or Missing Data for Charging System) is: PCM not broadcasting charging system data due to internal fault
Typical repair costs for U1115 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Charging system may not function properly leading to battery discharge. Vehicle may stall without warning if battery depletes completely while driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1115 to identify the root cause.
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Quick Info
Category
Network
System
Charging System / Network Communication
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
