B2145

Code

Other B — Body

NVM RF HR Failure

Brand: Other

Type: B — Body

Views: UK: 25 EN: 38 RU: 31

AI status

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Page language: EN

Causes

Corrupted or unreadable NVM/EEPROM data in the affected module
Module software/firmware bug or incomplete reflash
Intermittent or insufficient power supply to the module (battery, fused feed, ignition feed)
Poor or corroded ground or connector making NVM accesses fail
Water ingress or physical damage to the module
Failed or marginal module hardware (internal memory or controller)

Symptoms

Stored B2145 DTC in body/control module memory
Intermittent or complete loss of RF functions (key fob, remote locks, remote start)
Unexpected behavior of RF-related features (e.g., inconsistent locking/unlocking)
Module not responding to diagnostics or failing to accept reprogramming
Related communication errors on vehicle bus (intermittent)

What to check

Read freeze frame and all stored DTCs from all body and RF-related modules with a capable scan tool
Check vehicle history: recent battery disconnects, module replacements, or software updates
Visually inspect module connectors and wiring for corrosion, deformation, water ingress or damage
Verify battery state of charge and main power feed fuses for the module
Measure and record supply voltage and ground at the module with ignition ON and cranking
Check CAN/LIN bus activity and confirm the module is communicating with other modules

Signal parameters

Module battery feed voltage (V) — steady with ignition state (expected ~12–14V)
Ignition/switched feed voltage (V) — present when required
Module ground resistance (ohms) — low, near chassis ground
CAN/LIN bus traffic — module transmitting/receiving messages
NVM read/write status or internal error counters (if available via dealer tool)
RF receive signal strength (dBm) or keyfob received events (if the module provides)

Diagnostic algorithm

Connect a diagnostic scan tool and read all stored DTCs and freeze-frame data from the body/RF module. Record occurrences and related PIDs.
Attempt to clear the DTC and reproduce the customer concern. If DTC returns, proceed.
Inspect connectors, wiring, and module for corrosion, water entry or mechanical damage. Repair any obvious faults.
Verify battery voltage and relevant fuses. Repair/replace blown fuses or poor power feeds.
Back-probe module power and ground pins; confirm stable voltages and good ground under all conditions (ignition ON and during attempted writes).
Check vehicle network communications (CAN/LIN). If communications are lost or intermittent, diagnose wiring/terminator/other module faults first (U-codes may be present).
If hardware/power/communications are good, attempt manufacturer-approved reflash or NVM reinitialization using OEM diagnostic tool. Follow exact reprogramming steps and sequence.
After successful reflash, perform required relearns/configuration and clear codes. Verify normal operation and that B2145 does not return.
If reflash fails or NVM errors persist after correct power/communications and official reprogramming, replace the affected module per manufacturer procedure.
If module replacement is performed, program and configure new module per OEM instructions and verify operation.

Likely causes

Corrupted NVM area in the RF-related body/control module
Faulty module hardware (EEPROM failure)
Missing or unstable power/ground to the module during a write operation
Incomplete or failed software update/reflash

Fault status

⚠️ Status

Module detected NVM integrity or access error for the RF HR subsystem. The fault is logged in module memory; it may be stored as a current (active) or historic code. The condition often indicates corrupted stored data, failed write/read operations, or module hardware faults and may require reprogramming or module replacement.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours