What Does P1629 Mean?
The powertrain control module is missing expected communication messages from the adaptive cruise control or distance monitoring system. This indicates a network communication failure between the cruise control module and PCM.
Common Causes
30%
Adaptive cruise control module failure or not responding
30%
Data bus wiring issue affecting cruise control circuit
20%
Damaged or misaligned front radar sensor
15%
Module connector corrosion or pin damage
5%
Software version mismatch between modules
Diagnostic Steps
1
Step 1: Verify adaptive cruise control module responds on scan tool network scan
2
Step 2: Check for fault codes stored in cruise control or driver assistance modules
3
Step 3: Inspect front radar sensor for physical damage, debris, or misalignment
4
Step 4: Test CAN bus communication lines specific to cruise control module circuit
5
Step 5: Check for service bulletins regarding software updates for communication issues
Estimated Repair Cost
$150 - $1,800
Parts + labor, varies by vehicle and location
The powertrain control module is missing expected communication messages from the adaptive cruise control or distance monitoring system. This indicates a network communication failure between the cruise control module and PCM.
The most common cause of P1629 (Data-Bus Powertrain missing message from distance control) is: Adaptive cruise control module failure or not responding
Typical repair costs for P1629 range from $150 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Adaptive cruise control will be disabled but regular driving is safe. Manually monitor following distance and speed control.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1629 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cruise Control System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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