What Does U1114 Mean?
The requesting module cannot receive valid charging system data over the SCP network. This indicates the PCM is not broadcasting alternator/charging information to other modules that need it.
Common Causes
35%
Failed alternator or voltage regulator preventing proper charging data
25%
Faulty powertrain control module unable to broadcast charging data
20%
Network communication fault preventing data transmission
15%
Damaged alternator wiring harness or connector
5%
Low battery voltage affecting system operation
Diagnostic Steps
1
Step 1: Test charging system output voltage at battery terminals with engine running (should be 13.5-14.5V)
2
Step 2: Monitor charging system PIDs on scan tool to verify PCM is receiving alternator data
3
Step 3: Check alternator field circuit and communication wire for proper voltage and continuity
4
Step 4: Inspect all connections between alternator, PCM, and battery for corrosion or damage
5
Step 5: Perform alternator load test to verify proper current output under electrical load
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The requesting module cannot receive valid charging system data over the SCP network. This indicates the PCM is not broadcasting alternator/charging information to other modules that need it.
The most common cause of U1114 (SCP (J1850) Invalid or Missing Data for Charging System) is: Failed alternator or voltage regulator preventing proper charging data
Typical repair costs for U1114 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May result in battery discharge and vehicle stalling if charging system fails. Battery warning light will likely be illuminated requiring immediate diagnosis.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1114 to identify the root cause.
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Quick Info
Category
Network
System
Charging System / Network Communication
Difficulty
Type
Manufacturer
Recommended Tools
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