Code
P0602
HUMMER
P — Powertrain
Control Module Not Programmed
AI status
Completed
Completed
100%
Causes
- Replacement or new control module installed that has not been programmed to the vehicle
- Module software erased or corrupted during previous service or software update
- Incomplete or failed module reflash/programming attempt
- Incorrect calibration or software version loaded
- Connector damage, poor battery power or voltage drop during programming
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- One or more modules not responding or missing on diagnostic scan
- Incorrect or missing VIN/calibration information in module
- Engine may not start, run poorly, or goes into limp mode
- Electrical systems behave incorrectly (locks, instrument cluster, BCM functions)
What to check
- Connect a professional scan tool; read and record stored DTCs and freeze frame
- Verify battery voltage is fully charged (12.6V+) and stable; use battery charger if required
- Confirm the affected module is detected on the vehicle network and reportable in the scan tool
- Check module part number, hardware ID and software/calibration ID via scanner
- Inspect module connectors and wiring for damage, corrosion, or loose pins
- Confirm recent repairs or module replacements that could explain the code
Signal parameters
- Module programming status (unprogrammed / blank / null calibration ID)
- Module hardware ID (part number) vs. expected VIN-dependent calibration
- Checksum or firmware version mismatch flags
- Module presence/communication on CAN/LIN bus
- Battery voltage during last programming session (if recorded)
Diagnostic algorithm
- Verify DTC and capture freeze frame. Check for related communication or memory codes (P0600, P0601, etc.).
- Confirm vehicle battery is fully charged and maintain stable voltage with a charger before programming.
- Inspect connectors and wiring to the module; repair any physical faults before attempting programming.
- Use a manufacturer-capable scan tool to read module information: part number, VIN programmed (if any), and software/calibration ID.
- If module shows unprogrammed/blank or incorrect calibration, obtain correct OEM calibration file and programming procedure for this HUMMER model/year.
- Attempt to program/flash the module per OEM instructions. Monitor for errors and ensure no voltage interruption.
- If programming fails, record exact error messages/codes from the programming tool and consult OEM technical service information.
- If module cannot be programmed (firmware fault), replace with OEM-supplied module already programmed to the vehicle or have dealer perform VIN-specific programming.
- After successful programming, clear DTCs, verify module reports correct VIN/calibration, and road-test. Re-scan to confirm no recurrence.
- If problem persists, escalate to dealer/technical support with scan and programming logs.
Likely causes
- Recently replaced PCM/ECM/BCM that was not dealer-programmed
- Aftermarket or remanufactured module supplied without correct VIN/calibration
- Interrupted reflash due to low battery voltage or lost communication
- Incorrect build/configuration loaded (wrong vehicle model/year)
- Internal memory/firmware fault preventing successful programming
Fault status
Status
P0602 — Control Module Not Programmed: module lacks required vehicle-specific programming or calibration.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Repair manuals
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138
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