C1600

Code

HYUNDAI C — Chassis

ABS Control Module Internal Fault

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 20 EN: 49 RU: 26

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Page language: EN

Causes

Internal ABS control module hardware failure or corrupted firmware
Low or unstable battery/charging system voltage
Faulty power supply fuse or relay to ABS module
Poor ground or corroded module connector pins
Water intrusion or physical damage to the module
CAN bus or LIN communication fault between modules

Symptoms

ABS warning lamp illuminated (may be accompanied by ESC/traction control lamp)
Loss of ABS functionality (normal braking remains but ABS not active)
Intermittent or permanent disablement of traction/stability control
Possible degraded braking feel under hard braking
Stored DTC(s) related to ABS module and communication

What to check

Use a scan tool to read all ABS and network codes and capture freeze-frame data
Visually inspect ABS module, mounting area, connector and wiring for corrosion, water, damage
Check battery voltage (key on, engine off and cranking) and charging system health
Inspect/verify ABS-related fuses and relays are present and good
Verify good ground(s) at the ABS module and vehicle chassis
Check CAN bus communication with scanner (verify module responds and messages present)

Signal parameters

Module supply voltage: approx. 11–14.5 V (key on and engine running)
Ignition-switched power present at ABS power pin with key ON
Ground resistance: low ohms to chassis (near 0 Ω)
CAN bus idle voltages: ~2.5 V on CAN H and CAN L, ~60 Ω between CAN H and CAN L (termination)
Wheel speed sensor: AC or variable voltage/frequency proportional to wheel speed; resistance within manufacturer spec
ABS module current draw: compare to service specification (abnormal high/low draw indicates fault)

Diagnostic algorithm

Connect a capable scan tool, read all fault codes and pending/freeze-frame data; note related codes.
Clear codes, then perform ignition cycles and a short road test to see if C1600 returns and under what conditions.
Visually inspect ABS module, connectors, harness, and mounting for moisture, damage or corrosion; repair any corrosion/loose pins.
Check battery and charging system; confirm stable system voltage and good battery condition before proceeding.
Verify ABS fuses/relays and measure power/ground at the ABS module with a meter (key on).
Check CAN bus communication: verify module presence on network, message flow, and correct bus termination (approx. 60 ohms).
Inspect and test each wheel speed sensor and associated wiring for open/shorts and correct signal while rotating the wheel.
Perform wiggle/stress tests on harness and connectors while monitoring live data to locate intermittent faults.
If electrical supply and communications are good but fault persists, attempt module software update/reflash per OEM procedure (do not attempt generic reflashes).
If reflash fails or module still reports internal faults, replace ABS control module with OEM part and perform required programming/coding and post‑repair verification.
After repair or replacement, clear codes and perform a controlled road test to confirm proper ABS and ESC operation.

Likely causes

Failed ABS control module electronics (most likely if other systems report no supply issues)
Missing or intermittent battery voltage to module (weak battery, bad alternator, loose terminal)
Corroded or loose connector or ground at ABS module
Blown ABS fuse or failed ABS pump relay
CAN bus termination or wiring fault preventing module communication
Faulty wheel speed sensor or tone ring causing internal error when processing inputs

Fault status

⚠️ Status

ABS Control Module Internal Fault — internal electronic or communication error detected in the ABS module. Inspect power, ground, connectors, CAN network and sensor inputs before considering module replacement.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.5-3.0 hours

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C1600 — ABS Control Module Internal Fault