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Home / DTC / C2339 — ABS/ESC Module Communication Fault

C2339 — ABS/ESC Module Communication Fault

Detailed page for trouble code C2339.

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Code

C2339

Generic C — Chassis

ABS/ESC Module Communication Fault

Brand: Generic
Type: C — Chassis
Views: UK: 1 EN: 3 RU: 1
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, shorted or corroded wiring/connectors to the ABS/ESC module
  • Poor power supply or ground to the ABS/ESC module (low battery, blown fuse, bad relay)
  • Faulty ABS/ESC module or internal electronics
  • CAN (or other vehicle network) bus fault such as short to voltage/ground or missing termination
  • Intermittent wiring harness damage (chafing, water intrusion)
  • Software/configuration mismatch or failed module programming

Symptoms

  • ABS and/or ESC (traction control) warning lamp illuminated
  • Possible loss of ABS/ESC functions (no ABS or traction control intervention)
  • Reduced driving stability features or drivability limp mode in some vehicles
  • Stored communication and related ABS codes in memory
  • Intermittent or permanent faults depending on wiring/connection condition

What to check

  • Read all stored codes and freeze frame with a capable scan tool; log related U/C codes
  • Attempt to communicate with the ABS/ESC module with the scan tool (identify if module responds)
  • Inspect ABS module connectors and harness for corrosion, water, damage and secure connection
  • Check battery voltage (key on, engine off) and charging system; verify fuses/relays supplying ABS module
  • Measure power and ground at the ABS/ESC module connector
  • Check CAN bus for presence of frames using a diagnostic tool or oscilloscope

Signal parameters

  • Recessive CAN state: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
  • Dominant CAN state: typical CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
  • Expected bus termination resistance between CAN_H and CAN_L ≈ 60 ohms (two 120 Ω terminators in parallel)
  • ABS/ESC module supply voltage (key on) typically 11–14.5 V; ground resistance < 0.5 Ω
  • No valid CAN frames from ABS/ESC module visible if module not communicating

Diagnostic algorithm

  1. Connect a diagnostic scan tool; record C2339 plus any related U‑codes and freeze frame data. Note whether ABS/ESC module is listed and responds.
  2. Verify battery voltage and charging system. Confirm fuses/relays for ABS/ESC power are present and not blown; inspect fuse box for corrosion.
  3. Visually inspect ABS/ESC module connector and harness for corrosion, bent pins, water ingress or physical damage. Secure connector and re-check communications.
  4. With key on, measure supply voltage and ground at the ABS/ESC module connector. If power/ground missing or intermittent, trace and repair circuit before further testing.
  5. Check CAN bus operation: use a scope or scan tool to confirm CAN_H/CAN_L voltages and presence of frames. Measure termination resistance between CAN_H and CAN_L (~60 Ω).
  6. If CAN bus fault found, isolate sections: disconnect other nodes (where safe) to see if a specific module or segment causes bus failure. Repair/replace faulty wiring or module.
  7. Perform wiggle/torque tests on harness and connectors while monitoring communications to find intermittent faults.
  8. If wiring, power and bus are good and module still does not respond, consult manufacturer reprogramming/recall/TSB information. Consider replacing or reprogramming the ABS/ESC module as directed.
  9. After repair, clear codes and perform a test drive or network stress test to confirm fault does not return.

Likely causes

  • Loose, corroded or disconnected connector at the ABS/ESC module
  • Blown fuse or missing power/ground to the ABS/ESC module
  • CAN bus open or failed termination resistors
  • Damaged communication wiring (pinched/chafed harness)
  • Failed ABS/ESC control module

Fault status

⚠️ Status
ABS/ESC module communication fault — module not responding or intermittent on vehicle network (CAN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
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Code

C2339

HYUNDAI C — Chassis

Rear Right(RR) Valve (Out) - Electrical. | Reverse Valve 2 Failure

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 14 EN: 12 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, shorted or corroded wiring/connectors to the ABS/ESC module
  • Poor power supply or ground to the ABS/ESC module (low battery, blown fuse, bad relay)
  • Faulty ABS/ESC module or internal electronics
  • CAN (or other vehicle network) bus fault such as short to voltage/ground or missing termination
  • Intermittent wiring harness damage (chafing, water intrusion)
  • Software/configuration mismatch or failed module programming

Symptoms

  • ABS and/or ESC (traction control) warning lamp illuminated
  • Possible loss of ABS/ESC functions (no ABS or traction control intervention)
  • Reduced driving stability features or drivability limp mode in some vehicles
  • Stored communication and related ABS codes in memory
  • Intermittent or permanent faults depending on wiring/connection condition

What to check

  • Read all stored codes and freeze frame with a capable scan tool; log related U/C codes
  • Attempt to communicate with the ABS/ESC module with the scan tool (identify if module responds)
  • Inspect ABS module connectors and harness for corrosion, water, damage and secure connection
  • Check battery voltage (key on, engine off) and charging system; verify fuses/relays supplying ABS module
  • Measure power and ground at the ABS/ESC module connector
  • Check CAN bus for presence of frames using a diagnostic tool or oscilloscope

Signal parameters

  • Recessive CAN state: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
  • Dominant CAN state: typical CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
  • Expected bus termination resistance between CAN_H and CAN_L ≈ 60 ohms (two 120 Ω terminators in parallel)
  • ABS/ESC module supply voltage (key on) typically 11–14.5 V; ground resistance < 0.5 Ω
  • No valid CAN frames from ABS/ESC module visible if module not communicating

Diagnostic algorithm

  1. Connect a diagnostic scan tool; record C2339 plus any related U‑codes and freeze frame data. Note whether ABS/ESC module is listed and responds.
  2. Verify battery voltage and charging system. Confirm fuses/relays for ABS/ESC power are present and not blown; inspect fuse box for corrosion.
  3. Visually inspect ABS/ESC module connector and harness for corrosion, bent pins, water ingress or physical damage. Secure connector and re-check communications.
  4. With key on, measure supply voltage and ground at the ABS/ESC module connector. If power/ground missing or intermittent, trace and repair circuit before further testing.
  5. Check CAN bus operation: use a scope or scan tool to confirm CAN_H/CAN_L voltages and presence of frames. Measure termination resistance between CAN_H and CAN_L (~60 Ω).
  6. If CAN bus fault found, isolate sections: disconnect other nodes (where safe) to see if a specific module or segment causes bus failure. Repair/replace faulty wiring or module.
  7. Perform wiggle/torque tests on harness and connectors while monitoring communications to find intermittent faults.
  8. If wiring, power and bus are good and module still does not respond, consult manufacturer reprogramming/recall/TSB information. Consider replacing or reprogramming the ABS/ESC module as directed.
  9. After repair, clear codes and perform a test drive or network stress test to confirm fault does not return.

Likely causes

  • Loose, corroded or disconnected connector at the ABS/ESC module
  • Blown fuse or missing power/ground to the ABS/ESC module
  • CAN bus open or failed termination resistors
  • Damaged communication wiring (pinched/chafed harness)
  • Failed ABS/ESC control module

Fault status

⚠️ Status
ABS/ESC module communication fault — module not responding or intermittent on vehicle network (CAN).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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