What Does U1249 Mean?
Secondary or repeated failure to receive valid time and date data on the SCP J1850 network. This suggests an intermittent or persistent problem with clock data transmission.
Common Causes
30%
Intermittent connection at radio or instrument cluster module connector
25%
Clock module intermittent internal failure or loose component
20%
Intermittent SCP bus communication fault affecting time data packets
15%
Software glitch in time-keeping module requiring reset or reprogramming
10%
Voltage fluctuation causing clock module to reset or malfunction intermittently
Diagnostic Steps
1
Step 1: Clear codes and monitor for recurrence pattern (immediate, after driving, or random)
2
Step 2: Check if time/date resets to default or becomes incorrect when code sets
3
Step 3: Perform connector wiggle test on radio and instrument cluster while monitoring communication
4
Step 4: Check Technical Service Bulletins for software updates related to time/date transmission
5
Step 5: Verify proper voltage supply to clock module during various operating conditions
Estimated Repair Cost
$90 - $550
Parts + labor, varies by vehicle and location
Secondary or repeated failure to receive valid time and date data on the SCP J1850 network. This suggests an intermittent or persistent problem with clock data transmission.
The most common cause of U1249 (SCP (J1850) Invalid or Missing Data for Time / Date) is: Intermittent connection at radio or instrument cluster module connector
Typical repair costs for U1249 range from $90 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety concerns. Vehicle remains fully operational; only time display and time-stamped functions may be unreliable.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1249 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication / Instrument Cluster / Audio System
Difficulty
Type
Manufacturer
Recommended Tools
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