What Does P1628 Mean?
The powertrain control module has detected a communication error on the vehicle's internal network bus. This indicates data transmission failures between the engine control module and traction control system or other powertrain-related modules.
Common Causes
35%
CAN bus wiring damage, short, or open circuit
25%
Faulty module causing bus interference (PCM, TCM, or ABS module)
20%
Corroded or loose module connectors
15%
Poor ground connections affecting multiple modules
5%
Water intrusion in module or wiring harness
Diagnostic Steps
1
Step 1: Check for multiple communication codes across different modules to isolate fault
2
Step 2: Measure CAN bus voltage at PCM connector (should read approximately 2.5V on each line)
3
Step 3: Disconnect modules one at a time to identify if one is pulling down the bus
4
Step 4: Inspect all accessible CAN bus wiring for damage, particularly at harness flex points
5
Step 5: Test termination resistance across CAN High and Low (should be 60 ohms with all modules connected)
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The powertrain control module has detected a communication error on the vehicle's internal network bus. This indicates data transmission failures between the engine control module and traction control system or other powertrain-related modules.
The most common cause of P1628 (Powertrain Control Module (ECM/TCS) Any Line Communication Error) is: CAN bus wiring damage, short, or open circuit
Typical repair costs for P1628 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May disable traction control, stability control, or cause unexpected engine behavior. Drive cautiously and avoid adverse weather conditions until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1628 to identify the root cause.
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Quick Info
Category
Powertrain
System
Communication Network
Difficulty
Type
Manufacturer
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