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Home / DTC / U045A — Invalid Data Received From Parking Assist Control Module A

U045A — Invalid Data Received From Parking Assist Control Module A

Detailed page for trouble code U045A.

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Code

U045A

Generic U — Network/User

Invalid Data Received From Parking Assist Control Module A

Brand: Generic
Type: U — Network/User
Views: UK: 10 EN: 19 RU: 28
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Page language: EN

Causes

  • Faulty Parking Assist Control Module A (internal failure or firmware mismatch)
  • CAN/LIN bus wiring fault (open, short to battery/ground, high resistance)
  • Corroded or loose connectors at the parking assist module or splice points
  • Incorrect or missing module programming/calibration after replacement or update
  • Intermittent power or ground to the parking assist module
  • Other module on the same network transmitting corrupted messages

Symptoms

  • Parking assist system disabled or inoperative
  • Parking assist warning message or lamp on instrument cluster
  • Intermittent or constant communication-related fault codes for parking assist
  • No audible warnings or wrong distance readings from parking sensors
  • Other networked systems reporting communication errors or degraded function

What to check

  • Retrieve all U-codes and related freeze-frame / live data with a capable scan tool
  • Verify ability to communicate with Parking Assist Control Module A using OEM-level tool
  • Inspect physical connectors, pins, and wiring at the parking assist module and related harnesses for corrosion, damage, or looseness
  • Measure module supply voltage and ground continuity with key ON (expected nominal 11–14 V and solid ground)
  • Measure CAN (or LIN) bus voltages and waveform with an oscilloscope or CAN bus tester
  • Check bus termination resistance across CAN_H and CAN_L (approx. expected value per vehicle, typically ~60 ohms)

Signal parameters

  • Ability to establish diagnostic session with Parking Assist Control Module A (yes/no)
  • Presence and frequency of parking assist CAN messages (message ID/DLC and expected periodic rate)
  • Parking sensor status codes and raw distance values (e.g., mm) reported by module
  • CAN_H and CAN_L idle and dominant voltage waveforms and differential amplitude
  • Supply voltage at module (11–14 V) and ground resistance (
  • Bus termination resistance across CAN_H and CAN_L

Diagnostic algorithm

  1. Connect a professional scan tool and record U045A and any related codes; capture freeze-frame and live data.
  2. Confirm whether the scan tool can communicate with Parking Assist Control Module A. If not, diagnose network/communication loss (lost communication U-codes).
  3. Inspect the parking assist module connector and visible wiring for corrosion, bent pins, broken wires, or water ingress; repair any damage.
  4. With ignition ON, measure supply voltage at the module connector and verify a good ground. Repair wiring if voltages are out of range.
  5. Check CAN (or LIN) bus physical layer: measure CAN_H/CAN_L voltages and observe waveforms with an oscilloscope while exercising vehicle functions that should generate parking assist traffic.
  6. Verify termination resistor value and continuity of CAN bus. Repair or replace wiring/terminator if open or incorrect.
  7. If intermittent, perform a wiggle test on wiring and connectors while monitoring live bus messages to reproduce the fault.
  8. If module communication is present but messages show invalid payloads, check sensors and upstream inputs to the parking assist module; replace or repair faulty sensor(s) as required.
  9. Verify module software/calibration level against manufacturer specification; reprogram or update module software if required.
  10. After repairs, clear codes and re-test to confirm fault does not return under normal operating conditions; if code persists, consider module replacement per service manual guidance.

Likely causes

  • Damaged connector or pin at Parking Assist Control Module A
  • High resistance on module power or ground (corrosion, broken wire)
  • Short or intermittent short between CAN_H and CAN_L or to battery/ground
  • Failed parking sensors causing malformed payload forwarded by the module
  • Software/firmware incompatibility after previous module replacement or update
  • Bus termination resistor missing or open causing reflections and corrupted frames

Fault status

⚠️ Status
Invalid Data Received From Parking Assist Control Module A — the network is receiving unexpected or corrupted messages from the parking assist module, indicating a communication fault, data integrity issue, or module malfunction.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0415 U0422
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