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DTC codes / U05xx · Network communication / U057D

U057DInvalid Data Received From Off-Board Charger Control Module

U057D is a communication fault where the off-board charger control module, the component that manages charging from an external power source, sends data the vehicle's network cannot validate as correct. The computer detected missing, implausible, or corrupted messages from that module rather than a confirmed charging system failure.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaNetwork communication

Symptoms you may notice

  • Illumination of the malfunction indicator lamp (MIL) or a dedicated service vehicle soon message
  • No noticeable driving symptoms in many cases because the fault affects charging communication, not propulsion
  • Failure or interruption of off-board charging sessions, including the vehicle not starting a charge or stopping early
  • Charging status or remaining time displays showing dashes, zeros, or frozen values
  • A warning message on the instrument cluster stating charging is unavailable or the charger is not recognized
  • Other network communication codes stored alongside U057D in modules that share the same bus

Common causes, most likely first

  1. Corroded, loose, or damaged pins in the off-board charger control module connector
  2. Chassis wiring harness damage from road debris, moisture intrusion, or chafing near the charge port
  3. Failed or intermittent off-board charger control module internal fault
  4. Low or unstable 12-volt battery voltage causing network communication errors
  5. Controller area network (CAN) bus wiring faults such as open circuits, shorts to ground, or shorts to power
  6. Poor ground connection at the off-board charger control module mounting point
  7. Software or calibration mismatch in the off-board charger control module after a replacement or update

How to diagnose and fix it

  1. Scan all modules for stored and pending codes, then record freeze-frame data for U057D before clearing anything
  2. Inspect the 12-volt battery state of charge and charging system output, correcting low voltage before further diagnosis
  3. Visually inspect the off-board charger control module connector and charge port wiring for corrosion, pushed pins, or water intrusion
  4. Perform a voltage drop and resistance test on the module's power and ground circuits using a digital multimeter
  5. Check CAN bus integrity with a scope or resistance measurement at the diagnostic link connector to rule out bus faults
  6. Verify module software level and perform any available calibration or reprogramming procedure
  7. If wiring and power are confirmed good, substitute a known-good off-board charger control module and retest communication

What the charger module code really means

  • U057D is a data-validation fault, so the off-board charger control module may still charge correctly while sending corrupted status frames that the network rejects.
  • A weak 12-volt battery is a frequent hidden cause because network modules drop offline or send invalid data when supply voltage sags during a charging session.
  • Technicians often replace the charger module prematurely when the real fault is a single corroded terminal in the charge port harness that only acts up in wet weather.
  • This code can be set by another module on the same bus that is disturbing communication, so always check for companion U-codes before condemning the charger module.
  • After any module replacement, a calibration or learn procedure is usually required, and skipping it can immediately reset U057D.

Can I keep driving with U057D?

The vehicle remains safe to drive because U057D affects charging communication rather than propulsion or braking, but avoid relying on off-board charging until the fault is repaired. Do not attempt long trips that depend on charging stops, and clear the code only after repairs so the fault history is preserved.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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