What Does P1614 Mean?
The malfunction indicator lamp (MIL) call-up circuit between the ECM and transmission control module (TCM) is experiencing a communication or signal range/performance issue. This affects the ability to illuminate the MIL for transmission-related faults.
Common Causes
30%
Poor communication on CAN bus network between ECM and TCM due to wiring issues
25%
Faulty TCM with internal communication circuit failure
20%
Corroded or damaged connectors at ECM or TCM affecting data lines
15%
ECM software issue or corrupted data affecting module communication
10%
Insufficient or excessive resistance in MIL request circuit between modules
Diagnostic Steps
1
Step 1: Using scan tool, check for communication with both ECM and TCM and verify both modules are responsive
2
Step 2: Monitor live data for MIL request signal from TCM while operating transmission through gear changes
3
Step 3: Check CAN bus network integrity by measuring resistance between CAN High and CAN Low (should be 60 ohms)
4
Step 4: Inspect all connectors at ECM and TCM for corrosion, bent pins, or moisture intrusion
5
Step 5: Compare ECM and TCM software versions to manufacturer specifications and update if needed
Estimated Repair Cost
$150 - $1,000
Parts + labor, varies by vehicle and location
The malfunction indicator lamp (MIL) call-up circuit between the ECM and transmission control module (TCM) is experiencing a communication or signal range/performance issue. This affects the ability to illuminate the MIL for transmission-related faults.
The most common cause of P1614 (MIL Call-up Circ./Transm.Contr.Module Range/Performance) is: Poor communication on CAN bus network between ECM and TCM due to wiring issues
Typical repair costs for P1614 range from $150 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No immediate safety risk, but transmission faults may not illuminate the MIL properly, preventing driver awareness of transmission problems.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1614 to identify the root cause.
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Quick Info
Category
Powertrain
System
Module Communication / Transmission
Difficulty
Type
Manufacturer
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