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Home / DTC / U049F — Invalid Data Received From Transmission Range Control Module

U049F — Invalid Data Received From Transmission Range Control Module

Detailed page for trouble code U049F.

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Code

U049F

Generic U — Network/User

Invalid Data Received From Transmission Range Control Module

Brand: Generic
Type: U — Network/User
Views: UK: 13 EN: 31 RU: 18
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Page language: EN

Causes

  • Corroded, loose or damaged wiring/connectors between the TRCM and the vehicle network
  • Faulty TRCM (internal electronics or sensor inputs)
  • Intermittent or low battery/ignition power or poor ground to the TRCM
  • CAN/LIN bus fault (short to battery/ground, missing termination, high bus error rate)
  • Software/firmware mismatch or corrupted module programming
  • Interference from aftermarket electronics or recent repairs

Symptoms

  • Malfunction Indicator Lamp (MIL) or network lamp illuminated
  • Incorrect or no gear indication on dash (PRNDL), failure to start in Park/Neutral interlock vehicles
  • Transmission stuck in limp mode or limited gear range
  • Intermittent loss of shift control or unexpected gear changes
  • Multiple U-codes or communication-related DTCs present

What to check

  • Scan all control modules and record current and history DTCs and freeze frame data
  • Check for other network codes (U0xxx series) that indicate bus issues
  • Visually inspect TRCM connectors and wiring for corrosion, damage, or loose pins
  • Verify battery voltage and inspect module power and ground circuits
  • Use a scan tool to monitor live CAN/LIN data for TRCM message presence and content
  • Check for recent repairs or aftermarket device installations that could affect the bus

Signal parameters

  • TRCM CAN message presence (module-specific CAN ID; typically periodic at 5–20 Hz)
  • Message contents typically include gear/PRNDL status, park/neutral switch state, and range sensor values
  • Expected message update rate and valid value ranges for gear position (manufacturer-specific)
  • CAN bus recessive/dominant behavior and normal bus voltage levels (idle ~2.5V on both CAN_H and CAN_L; differential when active)
  • Bus error counters, message CRC/sequence validity where supported by diagnostic tool

Diagnostic algorithm

  1. Retrieve all codes and freeze frame data from all modules. Note related U-codes and any P or B codes.
  2. On a capable scan tool, watch the TRCM messages on the CAN/LIN data list. Confirm whether TRCM messages appear and whether the values are plausible for ignition/shift lever position.
  3. Inspect TRCM connector and wiring at the module and along the harness routing for chafing, corrosion, crushed wires, or rodent damage.
  4. Verify power and ground at the TRCM with key ON; backprobe the power/ground pins and compare to vehicle battery voltage and ground resistance.
  5. Check CAN bus integrity: measure CAN_H and CAN_L voltages, look for shorts to battery/ground, and verify termination resistances.
  6. If bus looks physically good but messages are malformed, try isolating the fault by disconnecting the TRCM (or suspect module) and observe whether the U049F and related errors clear or change.
  7. If disconnecting the TRCM changes behavior, test TRCM inputs (range sensor, park/neutral switch) and internal grounds, repair wiring as needed, or replace the TRCM if confirmed faulty.
  8. If no single module is isolated and multiple modules report communication errors, inspect for gateway/module software mismatches and consider reflashing or updating module calibration following manufacturer procedures.
  9. After repairs or module replacement/reflash, clear codes, perform relearns/calibrations required for the TRCM or transmission, then road test and re-scan to confirm resolution.
  10. If problem persists, escalate to manufacturer technical service with recorded bus traces and freeze frame data.

Likely causes

  • Open/shorted CAN wires or damaged harness near transmission
  • Faulty/TRCM sending invalid PRNDL/gear position data
  • Poor ground at TRCM causing corrupted messages
  • Other module transmitting conflicting or malformed messages on the bus
  • Required module reflash or calibration not performed after replacement

Fault status

⚠️ Status
Invalid data received from the Transmission Range Control Module (TRCM). The PCM/TCM detected messages from the TRCM that were out of expected format or contained invalid values.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0073 U0401 P0705 U0415
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