Chevrolet Trax: DTC P1649: Immobilizer security code not programmed
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P1649
Immobilizer Security Code Not Programmed
Circuit/System Description
When learning the security code, as well as the challenge and response sequence, the engine control module (ECM) is placed in learn mode. Once the security code and challenge/response are learned, learn mode will be exited when the engine is successfully started.
Conditions for Running the DTC
The ECM is in learn mode.
Conditions for Setting the DTC
The ECM has not learned a security code.
Action Taken When the DTC Sets
The security indicator in the instrument cluster will illuminate.
Conditions for Clearing the DTC
- A current DTC will be cleared upon a successful engine start after exit of learn mode.
- A history DTC will be cleared after 100 malfunction-free ignition cycles.
Reference Information
Schematic Reference
Immobilizer Schematics (Encore), Immobilizer Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Immobilizer Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References
Circuit/System Verification
- Verify there are no immobilizer DTCs set in the K9 Body Control Module.
- If any immobilizer DTCs are set in the K9 Body Control Module
Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If no immobilizer DTCs are set in the K9 Body Control Module
- Perform the K20 Engine Control Module immobilizer learn using the engine control module IMMO Learn in SPS. Refer to Immobilizer System Component Programming.
- Verify the engine starts after the K20 Engine Control Module completes the learn procedure.
- If the engine does not start
Replace the K20 Engine Control Module.
- If the engine starts
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for engine control module replacement, programming, and setup.
READ NEXT:
DTC P1677: Immobilizer system disabled
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Onstar stolen vehicle slowdown active
Diagnostic Instructions
NOTE: This procedure
is not used in Brazil.
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an
Immobilizer - Repair instructions
THEFT DETERRENT MODULE REPLACEMENT (ENCORE)
Fig. 3: Theft Deterrent Module (Encore)
Theft Deterrent Module Replacement (Encore)
THEFT DETERRENT MODULE REPLACEMENT (TRAX)
Fig. 4: Theft Deterrent
SEE MORE:
Automatic Transmission
The selected gear is also shown in
the instrument cluster.
P (Park): This position locks the
drive wheels. It is the best position
to use when starting the engine
because the vehicle cannot move
easily.
Warning
It is dangerous to get out of the
vehicle if the shift lever is not fully
in P (Park)
Brake rotor/drum balance inspection
Support the vehicle drive axle on a suitable hoist. Refer to Lifting and
Jacking the Vehicle .
Remove the tire and wheel assemblies from the drive axle. Refer to Tire
and Wheel Removal and
Installation .
Reinstall the wheel nuts in order to retain the brake rotors.
Run the vehicle at the c
