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Home / DTC / P0602 — Control Module Programming Error

P0602 — Control Module Programming Error

Detailed page for trouble code P0602.

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Code

P0602

MERCEDES-BENZ P — Powertrain

Control Module Programming Error

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Interrupted or failed ECU/TCU programming (power loss during update)
  • Incorrect or incompatible software/calibration applied
  • Corrupted flash memory or internal checksum/validation error
  • Replacement module not programmed/coded to vehicle VIN or options
  • Low or unstable battery/charging voltage during programming
  • Damaged module hardware (water, impact) or internal processor fault

Symptoms

  • Malfunction indicator lamp (MIL) on
  • Module not communicating with scan tool or intermittent communication
  • Driveability symptoms or limp mode depending on affected module
  • Some vehicle functions disabled or behaving incorrectly
  • Loss of immobilizer/key recognition or failure to start (if security affected)

What to check

  • Read all stored and pending DTCs from all modules; record freeze-frame data and session info
  • Verify VIN, part number, and software/calibration IDs reported by the module
  • Check battery state of charge and charging system; ensure stable voltage (>12.4–12.8 V) or use a battery maintainer during programming
  • Inspect module connectors, pins, and ground points for corrosion, damage or loose connections
  • Scan CAN/vehicle bus for communication errors or timeouts
  • Check for recent service records—software updates, module replacements, tuning

Signal parameters

  • Battery/charging voltage during communication/programming (nominal idle: 12.4–14.4 V; programming recommended >=12.6 V or use maintainer)
  • Module identification (hardware part number) and software/calibration version
  • VIN reported by module matches vehicle VIN
  • CAN bus activity and error/frame counts
  • Module response time to OBD requests (should be consistent, not intermittent)
  • Checksum or validation result flags if available from OEM tool

Diagnostic algorithm

  1. Connect OEM-level scan tool and read complete DTC list from all control modules; save reports
  2. Verify the module’s part number, software/calibration level and VIN; compare to factory specification
  3. Confirm battery is fully charged and stable; connect battery maintainer or charger before reprogramming
  4. Inspect wiring, connectors, and grounds to the affected module; repair any damage or corrosion
  5. Attempt to communicate with the module; if communication fails, trace CAN/communication wiring and compare with other modules
  6. If module responds but shows programming error, obtain correct, latest OEM software/calibration and attempt a controlled reflash using manufacturer procedures
  7. If reflash fails repeatedly, try bench programming (if supported) or consult dealership/technical support for special tools or security unlock procedures
  8. If module cannot be reprogrammed or hardware fault suspected, replace module with correct part and program/code to vehicle per OEM security and immobilizer procedures
  9. Clear codes, perform relearn/coding necessary, then road test and re-scan for return of the fault; document software versions and steps taken

Likely causes

  • Failed or interrupted software update
  • Incorrect calibration file or wrong module fitted for this VIN
  • Low battery voltage during programming
  • Communication fault (CAN) or poor connector/ground causing corruption

Fault status

⚠️ Status
Control Module Programming Error — module indicates corrupted or incorrect software/calibration or a failed programming event. Verify software version, VIN match and reflash with OEM procedures.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours

Similar codes

P0600 P0601 P0603 P0606 P0610
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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