What Does P1640 Mean?
This code indicates that the powertrain control module has detected fault codes stored in another control module on the vehicle network. It serves as a notification that communication exists between modules and faults are present elsewhere that may affect powertrain operation.
Common Causes
35%
Active DTCs in transmission control module (TCM)
30%
Active DTCs in ABS/stability control module
20%
Active DTCs in body control module or instrument cluster
15%
CAN bus communication issues causing cross-module fault reporting
Diagnostic Steps
1
Step 1: Perform complete vehicle scan to identify all modules with stored DTCs
2
Step 2: Document all fault codes from every module and identify primary failures
3
Step 3: Address codes in other modules first, starting with the most severe or earliest set codes
4
Step 4: Clear all codes after repairs and verify P1640 does not return
5
Step 5: Monitor network communication parameters to ensure proper module interaction
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
This code indicates that the powertrain control module has detected fault codes stored in another control module on the vehicle network. It serves as a notification that communication exists between modules and faults are present elsewhere that may affect powertrain operation.
The most common cause of P1640 (Powertrain DTCs Available in Another Module) is: Active DTCs in transmission control module (TCM)
Typical repair costs for P1640 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safety depends on which modules have stored codes. Vehicle may have reduced functionality or performance until underlying issues are resolved.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1640 to identify the root cause.
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Quick Info
Category
Powertrain
System
Multi-Module Communication Network
Difficulty
Type
Manufacturer
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