What Does U1072 Mean?
The module cannot receive valid engine coolant temperature data over the SCP network. The PCM is not broadcasting coolant temperature information or the network path is interrupted.
Common Causes
35%
Failed engine coolant temperature (ECT) sensor or circuit
25%
PCM not transmitting due to invalid sensor input
20%
SCP bus communication failure specific to coolant data packet
12%
Instrument cluster or receiving module failure
8%
Intermittent connection at PCM or receiving module
Diagnostic Steps
1
Step 1: Check for engine coolant temperature sensor codes (P0115-P0119) in PCM
2
Step 2: Verify coolant temperature reading in PCM live data matches actual engine temperature
3
Step 3: Check if instrument cluster temperature gauge is functioning or if code is in cluster memory
4
Step 4: Monitor SCP bus for coolant temperature PID while comparing to PCM broadcast data
5
Step 5: Test ECT sensor resistance and compare to temperature specification chart
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The module cannot receive valid engine coolant temperature data over the SCP network. The PCM is not broadcasting coolant temperature information or the network path is interrupted.
The most common cause of U1072 (SCP (J1850) Invalid or Missing Data for Engine Coolant) is: Failed engine coolant temperature (ECT) sensor or circuit
Typical repair costs for U1072 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driver will not be warned of engine overheating conditions. Risk of engine damage if coolant temperature rises undetected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1072 to identify the root cause.
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Quick Info
Category
Network
System
Engine Cooling System / Communication Network
Difficulty
Type
Manufacturer
Recommended Tools
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