What Does U1073 Mean?
Another instance of missing engine coolant data on the SCP network, typically indicating a different receiving module or redundant coolant parameter is not being received. This may occur alongside U1072 when multiple modules require the same data.
Common Causes
30%
Failed ECT sensor preventing valid data transmission
25%
Multiple module communication loss on SCP bus
20%
PCM internal fault affecting message broadcasting
15%
Corroded or damaged connectors at receiving module
10%
Low voltage condition affecting network stability
Diagnostic Steps
1
Step 1: Identify which module is setting U1073 versus U1072 to isolate receiver fault
2
Step 2: Verify ECT sensor signal at PCM using multimeter and compare to specifications
3
Step 3: Check for loss of communication with multiple modules suggesting bus-wide issue
4
Step 4: Inspect power and ground circuits to all affected modules
5
Step 5: Substitute known-good coolant temperature data using scan tool PID viewer
Estimated Repair Cost
$120 - $900
Parts + labor, varies by vehicle and location
Another instance of missing engine coolant data on the SCP network, typically indicating a different receiving module or redundant coolant parameter is not being received. This may occur alongside U1072 when multiple modules require the same data.
The most common cause of U1073 (SCP (J1850) Invalid or Missing Data for Engine Coolant) is: Failed ECT sensor preventing valid data transmission
Typical repair costs for U1073 range from $120 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of coolant temperature warning capability increases risk of undetected overheating. HVAC system may not function properly without coolant temperature data.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1073 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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