What Does U1244 Mean?
Communication error on the SCP (Standard Corporate Protocol) J1850 network bus related to interior environment data. A module responsible for climate control or interior monitoring is not transmitting expected data or the data is corrupted.
Common Causes
35%
Climate control module (HVAC control head) failure or internal malfunction
25%
Damaged or corroded wiring in the SCP bus network to interior environment modules
20%
Body Control Module (BCM) communication fault or software corruption
15%
Interior temperature sensor or ambient light sensor module failure
5%
SCP bus termination resistor failure or improper termination
Diagnostic Steps
1
Step 1: Monitor live SCP bus communication data stream to identify which specific module is not transmitting interior environment data
2
Step 2: Inspect connectors and wiring at climate control module and related interior sensors for corrosion, damage, or loose connections
3
Step 3: Check voltage supply and ground circuits to the climate control module and interior environment sensors
4
Step 4: Test SCP bus network integrity using a digital storage oscilloscope to check signal quality and termination
5
Step 5: Replace or reprogram the suspect module based on diagnostic findings
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
Communication error on the SCP (Standard Corporate Protocol) J1850 network bus related to interior environment data. A module responsible for climate control or interior monitoring is not transmitting expected data or the data is corrupted.
The most common cause of U1244 (SCP (J1850) Invalid or Missing Data for Interior Environment) is: Climate control module (HVAC control head) failure or internal malfunction
Typical repair costs for U1244 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains safe to drive. Climate control functions may be inoperative or operate in default mode, affecting comfort but not safety.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1244 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication / Climate Control
Difficulty
Type
Manufacturer
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